mirror of
https://salsa.debian.org/freeipa-team/freeipa.git
synced 2025-02-25 18:55:28 -06:00
52aa008b87
Global DNS configuration is a nice tool to maintain a common DNS settings stored in LDAP which are then used for all enrolled IPA servers. However, the settings stored in LDAP override local settings in named.conf on DNS servers. This patch adds more information about global DNS configuration options in install scripts and DNS module help. https://fedorahosted.org/freeipa/ticket/2525
685 lines
24 KiB
Python
685 lines
24 KiB
Python
# Authors: Simo Sorce <ssorce@redhat.com>
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#
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# Copyright (C) 2007 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import tempfile
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import os
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import pwd
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import netaddr
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import installutils
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import ldap
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import service
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from ipaserver import ipaldap
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from ipaserver.install.dsinstance import realm_to_serverid
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from ipaserver.install.installutils import resolve_host
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from ipapython import sysrestore
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from ipapython import ipautil
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from ipalib.constants import DNS_ZONE_REFRESH
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from ipalib.parameters import IA5Str
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from ipalib.util import validate_zonemgr, normalize_zonemgr, gen_dns_update_policy
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from ipapython.ipa_log_manager import *
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import ipalib
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from ipalib import api, util, errors
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def check_inst(unattended):
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has_bind = True
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# So far this file is always present in both RHEL5 and Fedora if all the necessary
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# bind packages are installed (RHEL5 requires also the pkg: caching-nameserver)
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if not os.path.exists('/etc/named.rfc1912.zones'):
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print "BIND was not found on this system"
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print "Please install the 'bind' package and start the installation again"
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has_bind = False
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# Also check for the LDAP BIND plug-in
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if not os.path.exists('/usr/lib/bind/ldap.so') and \
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not os.path.exists('/usr/lib64/bind/ldap.so'):
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print "The BIND LDAP plug-in was not found on this system"
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print "Please install the 'bind-dyndb-ldap' package and start the installation again"
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has_bind = False
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if not has_bind:
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return False
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if not unattended and os.path.exists('/etc/named.conf'):
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msg = "Existing BIND configuration detected, overwrite?"
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return ipautil.user_input(msg, False)
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return True
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def normalize_zone(zone):
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if zone[-1] != '.':
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return zone + '.'
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else:
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return zone
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def create_reverse():
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return ipautil.user_input("Do you want to configure the reverse zone?", True)
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def named_conf_exists():
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named_fd = open('/etc/named.conf', 'r')
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lines = named_fd.readlines()
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named_fd.close()
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for line in lines:
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if line.startswith('dynamic-db "ipa"'):
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return True
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return False
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def dns_container_exists(fqdn, suffix, dm_password=None, ldapi=False, realm=None):
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"""
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Test whether the dns container exists.
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"""
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def object_exists(dn):
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"""
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Test whether the given object exists in LDAP.
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"""
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try:
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conn.search_ext_s(dn, ldap.SCOPE_BASE)
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except ldap.NO_SUCH_OBJECT:
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return False
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else:
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return True
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try:
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# At install time we may need to use LDAPI to avoid chicken/egg
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# issues with SSL certs and truting CAs
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if ldapi:
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conn = ipaldap.IPAdmin(host=fqdn, ldapi=True, realm=realm)
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else:
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conn = ipaldap.IPAdmin(host=fqdn, port=636, cacert=service.CACERT)
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if dm_password:
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conn.do_simple_bind(bindpw=dm_password)
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else:
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conn.do_sasl_gssapi_bind()
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except ldap.SERVER_DOWN:
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raise RuntimeError('LDAP server on %s is not responding. Is IPA installed?' % fqdn)
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ret = object_exists("cn=dns,%s" % suffix)
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conn.unbind_s()
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return ret
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def dns_zone_exists(name):
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try:
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zone = api.Command.dnszone_show(unicode(name))
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except ipalib.errors.NotFound:
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return False
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if len(zone) == 0:
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return False
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else:
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return True
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def get_reverse_record_name(zone, ip_address):
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ip = netaddr.IPAddress(ip_address)
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rev = '.' + normalize_zone(zone)
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fullrev = '.' + normalize_zone(ip.reverse_dns)
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if not fullrev.endswith(rev):
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raise ValueError("IP address does not match reverse zone")
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return fullrev[1:-len(rev)]
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def verify_reverse_zone(zone, ip_address):
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try:
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get_reverse_record_name(zone, ip_address)
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except ValueError:
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print "Invalid reverse zone %s" % zone
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return False
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return True
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def get_reverse_zone_default(ip_address):
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ip = netaddr.IPAddress(ip_address)
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items = ip.reverse_dns.split('.')
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if ip.version == 4:
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items = items[1:] # /24 for IPv4
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elif ip.version == 6:
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items = items[16:] # /64 for IPv6
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return normalize_zone('.'.join(items))
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def find_reverse_zone(ip_address):
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ip = netaddr.IPAddress(ip_address)
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zone = normalize_zone(ip.reverse_dns)
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while len(zone) > 0:
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if dns_zone_exists(zone):
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return zone
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foo, bar, zone = zone.partition('.')
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return None
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def get_reverse_zone(ip_address):
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return find_reverse_zone(ip_address) or get_reverse_zone_default(ip_address)
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def read_reverse_zone(default, ip_address):
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while True:
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zone = ipautil.user_input("Please specify the reverse zone name", default=default)
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if not zone:
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return None
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if verify_reverse_zone(zone, ip_address):
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break
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return normalize_zone(zone)
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def add_zone(name, zonemgr=None, dns_backup=None, ns_hostname=None, ns_ip_address=None,
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update_policy=None):
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if update_policy is None:
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update_policy = gen_dns_update_policy(api.env.realm)
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if zonemgr is None:
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zonemgr = 'hostmaster.%s' % name
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if ns_hostname is None:
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# automatically retrieve list of DNS masters
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dns_masters = api.Object.dnsrecord.get_dns_masters()
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if not dns_masters:
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raise errors.NotFound("No IPA server with DNS support found!")
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ns_main = dns_masters.pop(0)
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ns_replicas = dns_masters
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addresses = resolve_host(ns_main)
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if len(addresses) > 0:
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# use the first address
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ns_ip_address = addresses[0]
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else:
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ns_ip_address = None
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else:
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ns_main = ns_hostname
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ns_replicas = []
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try:
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api.Command.dnszone_add(unicode(name),
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idnssoamname=unicode(ns_main+'.'),
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idnssoarname=unicode(zonemgr),
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ip_address=unicode(ns_ip_address),
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idnsallowdynupdate=True,
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idnsupdatepolicy=unicode(update_policy),
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idnsallowquery=u'any',
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idnsallowtransfer=u'none',)
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except (errors.DuplicateEntry, errors.EmptyModlist):
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pass
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nameservers = ns_replicas + [ns_main]
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for hostname in nameservers:
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add_ns_rr(name, hostname, dns_backup=None, force=True)
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def add_reverse_zone(zone, ns_hostname=None, ns_ip_address=None,
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ns_replicas=[], update_policy=None, dns_backup=None):
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zone = normalize_zone(zone)
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if update_policy is None:
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update_policy = "grant %s krb5-subdomain %s PTR;" % (api.env.realm, zone)
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if ns_hostname is None:
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# automatically retrieve list of DNS masters
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dns_masters = api.Object.dnsrecord.get_dns_masters()
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if not dns_masters:
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raise errors.NotFound("No IPA server with DNS support found!")
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ns_main = dns_masters.pop(0)
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ns_replicas = dns_masters
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addresses = resolve_host(ns_main)
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if len(addresses) > 0:
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# use the first address
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ns_ip_address = addresses[0]
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else:
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ns_ip_address = None
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else:
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ns_main = ns_hostname
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ns_replicas = []
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try:
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api.Command.dnszone_add(unicode(zone),
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idnssoamname=unicode(ns_main+'.'),
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idnsallowdynupdate=True,
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ip_address=unicode(ns_ip_address),
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idnsupdatepolicy=unicode(update_policy),
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idnsallowquery=u'any',
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idnsallowtransfer=u'none',)
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except (errors.DuplicateEntry, errors.EmptyModlist):
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pass
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nameservers = ns_replicas + [ns_main]
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for hostname in nameservers:
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add_ns_rr(zone, hostname, dns_backup=None, force=True)
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def add_rr(zone, name, type, rdata, dns_backup=None, **kwargs):
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addkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
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addkw.update(kwargs)
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try:
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api.Command.dnsrecord_add(unicode(zone), unicode(name), **addkw)
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except (errors.DuplicateEntry, errors.EmptyModlist):
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pass
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if dns_backup:
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dns_backup.add(zone, type, name, rdata)
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def add_fwd_rr(zone, host, ip_address):
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addr = netaddr.IPAddress(ip_address)
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if addr.version == 4:
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add_rr(zone, host, "A", ip_address)
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elif addr.version == 6:
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add_rr(zone, host, "AAAA", ip_address)
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def add_ptr_rr(zone, ip_address, fqdn, dns_backup=None):
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name = get_reverse_record_name(zone, ip_address)
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add_rr(zone, name, "PTR", fqdn+".", dns_backup)
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def add_ns_rr(zone, hostname, dns_backup=None, force=True):
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add_rr(zone, "@", "NS", hostname+'.', dns_backup=dns_backup,
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force=force)
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def del_rr(zone, name, type, rdata):
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delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
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try:
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api.Command.dnsrecord_del(unicode(zone), unicode(name), **delkw)
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except (errors.NotFound, errors.EmptyModlist):
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pass
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def get_rr(zone, name, type):
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rectype = '%srecord' % unicode(type.lower())
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ret = api.Command.dnsrecord_find(unicode(zone), unicode(name))
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if ret['count'] > 0:
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for r in ret['result']:
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if rectype in r:
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return r[rectype]
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return []
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def zonemgr_callback(option, opt_str, value, parser):
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"""
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Properly validate and convert --zonemgr Option to IA5String
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"""
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# validate the value first
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try:
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validate_zonemgr(value)
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except ValueError, e:
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parser.error("invalid zonemgr: " + unicode(e))
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parser.values.zonemgr = value
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class DnsBackup(object):
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def __init__(self, service):
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self.service = service
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self.zones = {}
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def add(self, zone, record_type, host, rdata):
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"""
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Backup a DNS record in the file store so it can later be removed.
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"""
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if zone not in self.zones:
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zone_id = len(self.zones)
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self.zones[zone] = (zone_id, 0)
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self.service.backup_state("dns_zone_%s" % zone_id, zone)
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(zone_id, record_id) = self.zones[zone]
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self.service.backup_state("dns_record_%s_%s" % (zone_id, record_id),
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"%s %s %s" % (record_type, host, rdata))
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self.zones[zone] = (zone_id, record_id + 1)
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def clear_records(self, have_ldap):
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"""
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Remove all records from the file store. If we are connected to
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ldap, we will also remove them there.
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"""
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i = 0
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while True:
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zone = self.service.restore_state("dns_zone_%s" % i)
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if not zone:
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return
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j = 0
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while True:
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dns_record = self.service.restore_state("dns_record_%s_%s" % (i, j))
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if not dns_record:
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break
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if have_ldap:
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type, host, rdata = dns_record.split(" ", 2)
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try:
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delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
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api.Command.dnsrecord_del(unicode(zone), unicode(host), **delkw)
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except:
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pass
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j += 1
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i += 1
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class BindInstance(service.Service):
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def __init__(self, fstore=None, dm_password=None):
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service.Service.__init__(self, "named", dm_password=dm_password)
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self.dns_backup = DnsBackup(self)
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self.named_user = None
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self.domain = None
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self.host = None
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self.ip_address = None
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self.realm = None
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self.forwarders = None
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self.sub_dict = None
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self.reverse_zone = None
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self.dm_password = dm_password
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if fstore:
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self.fstore = fstore
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else:
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self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
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def setup(self, fqdn, ip_address, realm_name, domain_name, forwarders, ntp,
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reverse_zone, named_user="named", zonemgr=None,
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zone_refresh=DNS_ZONE_REFRESH, zone_notif=False):
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self.named_user = named_user
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self.fqdn = fqdn
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self.ip_address = ip_address
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self.realm = realm_name
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self.domain = domain_name
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self.forwarders = forwarders
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self.host = fqdn.split(".")[0]
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self.host_domain = '.'.join(fqdn.split(".")[1:])
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self.suffix = util.realm_to_suffix(self.realm)
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self.ntp = ntp
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self.reverse_zone = reverse_zone
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self.zone_refresh = zone_refresh
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self.zone_notif = zone_notif
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if not zonemgr:
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self.zonemgr = 'hostmaster.%s' % self.domain
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else:
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self.zonemgr = normalize_zonemgr(zonemgr)
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self.__setup_sub_dict()
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def create_sample_bind_zone(self):
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bind_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.zone.db.template", self.sub_dict)
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[bind_fd, bind_name] = tempfile.mkstemp(".db","sample.zone.")
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os.write(bind_fd, bind_txt)
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os.close(bind_fd)
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print "Sample zone file for bind has been created in "+bind_name
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def create_instance(self):
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try:
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self.stop()
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except:
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pass
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# get a connection to the DS
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self.ldap_connect()
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if installutils.record_in_hosts(self.ip_address, self.fqdn) is None:
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installutils.add_record_to_hosts(self.ip_address, self.fqdn)
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if not dns_container_exists(self.fqdn, self.suffix, realm=self.realm,
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ldapi=True, dm_password=self.dm_password):
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self.step("adding DNS container", self.__setup_dns_container)
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if dns_zone_exists(self.domain):
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self.step("adding NS record to the zone", self.__add_self_ns)
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else:
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self.step("setting up our zone", self.__setup_zone)
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if self.reverse_zone is not None:
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self.step("setting up reverse zone", self.__setup_reverse_zone)
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self.step("setting up our own record", self.__add_self)
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self.step("setting up kerberos principal", self.__setup_principal)
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self.step("setting up named.conf", self.__setup_named_conf)
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self.step("restarting named", self.__start)
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self.step("configuring named to start on boot", self.__enable)
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self.step("changing resolv.conf to point to ourselves", self.__setup_resolv_conf)
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self.start_creation("Configuring named:")
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def __start(self):
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try:
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self.backup_state("running", self.is_running())
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self.restart()
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except:
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print "named service failed to start"
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def __enable(self):
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self.backup_state("enabled", self.is_running())
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# We do not let the system start IPA components on its own,
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# Instead we reply on the IPA init script to start only enabled
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# components as found in our LDAP configuration tree
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self.ldap_enable('DNS', self.fqdn, self.dm_password, self.suffix)
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def __setup_sub_dict(self):
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if self.forwarders:
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fwds = "\n"
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for forwarder in self.forwarders:
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fwds += "\t\t%s;\n" % forwarder
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fwds += "\t"
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else:
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fwds = " "
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if self.ntp:
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optional_ntp = "\n;ntp server\n"
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optional_ntp += "_ntp._udp\t\tIN SRV 0 100 123\t%s""" % self.host
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else:
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optional_ntp = ""
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self.sub_dict = dict(FQDN=self.fqdn,
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IP=self.ip_address,
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DOMAIN=self.domain,
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HOST=self.host,
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REALM=self.realm,
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SERVER_ID=realm_to_serverid(self.realm),
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FORWARDERS=fwds,
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SUFFIX=self.suffix,
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OPTIONAL_NTP=optional_ntp,
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ZONEMGR=self.zonemgr,
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ZONE_REFRESH=self.zone_refresh,
|
|
PERSISTENT_SEARCH=self.zone_notif and "yes" or "no")
|
|
|
|
def __setup_dns_container(self):
|
|
self._ldap_mod("dns.ldif", self.sub_dict)
|
|
|
|
def __setup_zone(self):
|
|
if self.host_domain != self.domain:
|
|
# add DNS domain for host first
|
|
root_logger.debug("Host domain (%s) is different from DNS domain (%s)!" \
|
|
% (self.host_domain, self.domain))
|
|
root_logger.debug("Add DNS zone for host first.")
|
|
|
|
add_zone(self.host_domain, self.zonemgr, dns_backup=self.dns_backup,
|
|
ns_hostname=api.env.host, ns_ip_address=self.ip_address)
|
|
add_zone(self.domain, self.zonemgr, dns_backup=self.dns_backup,
|
|
ns_hostname=api.env.host, ns_ip_address=self.ip_address)
|
|
|
|
def __add_self_ns(self):
|
|
add_ns_rr(self.domain, api.env.host, self.dns_backup, force=True)
|
|
|
|
def __add_self(self):
|
|
zone = self.domain
|
|
resource_records = (
|
|
("_ldap._tcp", "SRV", "0 100 389 %s" % self.host),
|
|
("_kerberos", "TXT", self.realm),
|
|
("_kerberos._tcp", "SRV", "0 100 88 %s" % self.host),
|
|
("_kerberos._udp", "SRV", "0 100 88 %s" % self.host),
|
|
("_kerberos-master._tcp", "SRV", "0 100 88 %s" % self.host),
|
|
("_kerberos-master._udp", "SRV", "0 100 88 %s" % self.host),
|
|
("_kpasswd._tcp", "SRV", "0 100 464 %s" % self.host),
|
|
("_kpasswd._udp", "SRV", "0 100 464 %s" % self.host),
|
|
)
|
|
|
|
for (host, type, rdata) in resource_records:
|
|
if type == "SRV":
|
|
add_rr(zone, host, type, rdata, self.dns_backup)
|
|
else:
|
|
add_rr(zone, host, type, rdata)
|
|
if self.ntp:
|
|
add_rr(zone, "_ntp._udp", "SRV", "0 100 123 %s" % self.host)
|
|
|
|
# Add forward and reverse records to self
|
|
add_fwd_rr(zone, self.host, self.ip_address)
|
|
if self.reverse_zone is not None and dns_zone_exists(self.reverse_zone):
|
|
add_ptr_rr(self.reverse_zone, self.ip_address, self.fqdn)
|
|
|
|
def __setup_reverse_zone(self):
|
|
add_reverse_zone(self.reverse_zone, ns_hostname=api.env.host,
|
|
ns_ip_address=self.ip_address, dns_backup=self.dns_backup)
|
|
|
|
def __setup_principal(self):
|
|
dns_principal = "DNS/" + self.fqdn + "@" + self.realm
|
|
installutils.kadmin_addprinc(dns_principal)
|
|
|
|
# Store the keytab on disk
|
|
self.fstore.backup_file("/etc/named.keytab")
|
|
installutils.create_keytab("/etc/named.keytab", dns_principal)
|
|
p = self.move_service(dns_principal)
|
|
if p is None:
|
|
# the service has already been moved, perhaps we're doing a DNS reinstall
|
|
dns_principal = "krbprincipalname=%s,cn=services,cn=accounts,%s" % (dns_principal, self.suffix)
|
|
else:
|
|
dns_principal = p
|
|
|
|
# Make sure access is strictly reserved to the named user
|
|
pent = pwd.getpwnam(self.named_user)
|
|
os.chown("/etc/named.keytab", pent.pw_uid, pent.pw_gid)
|
|
os.chmod("/etc/named.keytab", 0400)
|
|
|
|
# modify the principal so that it is marked as an ipa service so that
|
|
# it can host the memberof attribute, then also add it to the
|
|
# dnsserver role group, this way the DNS is allowed to perform
|
|
# DNS Updates
|
|
dns_group = "cn=DNS Servers,cn=privileges,cn=pbac,%s" % self.suffix
|
|
if isinstance(dns_principal, unicode):
|
|
dns_principal = dns_principal.encode('utf-8')
|
|
mod = [(ldap.MOD_ADD, 'member', dns_principal)]
|
|
|
|
try:
|
|
self.admin_conn.modify_s(dns_group, mod)
|
|
except ldap.TYPE_OR_VALUE_EXISTS:
|
|
pass
|
|
except Exception, e:
|
|
root_logger.critical("Could not modify principal's %s entry" % dns_principal)
|
|
raise e
|
|
|
|
def __setup_named_conf(self):
|
|
self.fstore.backup_file('/etc/named.conf')
|
|
named_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.named.conf.template", self.sub_dict)
|
|
named_fd = open('/etc/named.conf', 'w')
|
|
named_fd.seek(0)
|
|
named_fd.truncate(0)
|
|
named_fd.write(named_txt)
|
|
named_fd.close()
|
|
|
|
def __setup_resolv_conf(self):
|
|
self.fstore.backup_file('/etc/resolv.conf')
|
|
resolv_txt = "search "+self.domain+"\nnameserver "+self.ip_address+"\n"
|
|
resolv_fd = open('/etc/resolv.conf', 'w')
|
|
resolv_fd.seek(0)
|
|
resolv_fd.truncate(0)
|
|
resolv_fd.write(resolv_txt)
|
|
resolv_fd.close()
|
|
|
|
def add_master_dns_records(self, fqdn, ip_address, realm_name, domain_name,
|
|
reverse_zone, ntp=False):
|
|
self.fqdn = fqdn
|
|
self.ip_address = ip_address
|
|
self.realm = realm_name
|
|
self.domain = domain_name
|
|
self.host = fqdn.split(".")[0]
|
|
self.suffix = util.realm_to_suffix(self.realm)
|
|
self.ntp = ntp
|
|
self.reverse_zone = reverse_zone
|
|
|
|
self.__add_self()
|
|
|
|
def remove_master_dns_records(self, fqdn, realm_name, domain_name):
|
|
host = fqdn.split(".")[0]
|
|
suffix = util.realm_to_suffix(realm_name)
|
|
|
|
zone = domain_name
|
|
resource_records = (
|
|
("_ldap._tcp", "SRV", "0 100 389 %s" % host),
|
|
("_kerberos._tcp", "SRV", "0 100 88 %s" % host),
|
|
("_kerberos._udp", "SRV", "0 100 88 %s" % host),
|
|
("_kerberos-master._tcp", "SRV", "0 100 88 %s" % host),
|
|
("_kerberos-master._udp", "SRV", "0 100 88 %s" % host),
|
|
("_kpasswd._tcp", "SRV", "0 100 464 %s" % host),
|
|
("_kpasswd._udp", "SRV", "0 100 464 %s" % host),
|
|
("_ntp._udp", "SRV", "0 100 123 %s" % host),
|
|
("@", "NS", fqdn+"."),
|
|
)
|
|
|
|
for (record, type, rdata) in resource_records:
|
|
del_rr(zone, record, type, rdata)
|
|
|
|
areclist = [("A", x) for x in get_rr(zone, host, "A")] + [("AAAA", x) for x in get_rr(zone, host, "AAAA")]
|
|
for (type, rdata) in areclist:
|
|
del_rr(zone, host, type, rdata)
|
|
|
|
rzone = find_reverse_zone(rdata)
|
|
if rzone is not None:
|
|
record = get_reverse_record_name(rzone, rdata)
|
|
del_rr(rzone, record, "PTR", fqdn+".")
|
|
# remove also master NS record from the reverse zone
|
|
del_rr(rzone, "@", "NS", fqdn+".")
|
|
|
|
def check_global_configuration(self):
|
|
"""
|
|
Check global DNS configuration in LDAP server and inform user when it
|
|
set and thus overrides his configured options in named.conf.
|
|
"""
|
|
result = api.Command.dnsconfig_show()
|
|
global_conf_set = any(param in result['result'] for \
|
|
param in api.Object['dnsconfig'].params)
|
|
|
|
if not global_conf_set:
|
|
print "Global DNS configuration in LDAP server is empty"
|
|
print "You can use 'dnsconfig-mod' command to set global DNS options that"
|
|
print "would override settings in local named.conf files"
|
|
return
|
|
|
|
print "Global DNS configuration in LDAP server is not empty"
|
|
print "The following configuration options override local settings in named.conf:"
|
|
print ""
|
|
textui = ipalib.cli.textui()
|
|
api.Command.dnsconfig_show.output_for_cli(textui, result, None, reverse=False)
|
|
|
|
def uninstall(self):
|
|
if self.is_configured():
|
|
self.print_msg("Unconfiguring %s" % self.service_name)
|
|
|
|
running = self.restore_state("running")
|
|
enabled = self.restore_state("enabled")
|
|
|
|
self.dns_backup.clear_records(api.Backend.ldap2.isconnected())
|
|
|
|
if not running is None:
|
|
self.stop()
|
|
|
|
for f in ["/etc/named.conf", "/etc/resolv.conf"]:
|
|
try:
|
|
self.fstore.restore_file(f)
|
|
except ValueError, error:
|
|
root_logger.debug(error)
|
|
pass
|
|
|
|
if not enabled is None and not enabled:
|
|
self.disable()
|
|
|
|
if not running is None and running:
|
|
self.start()
|