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https://salsa.debian.org/freeipa-team/freeipa.git
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ceb7c9cf4b
Create DNS domain for IPA server hostname first so that it's forward record can be added. This results in 2 forward DNS zones created when server hostname doesn't equal server domain. https://fedorahosted.org/freeipa/ticket/1194
582 lines
21 KiB
Python
582 lines
21 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 logging
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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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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 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):
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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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server.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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server = ldap.initialize("ldap://" + fqdn)
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server.simple_bind_s()
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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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server.unbind_s()
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return ret
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def get_reverse_zone(ip_address_str, ip_prefixlen):
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ip = netaddr.IPAddress(ip_address_str)
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items = ip.reverse_dns.split('.')
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if ip.version == 4:
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pos = 4 - ip_prefixlen / 8
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elif ip.version == 6:
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pos = 32 - ip_prefixlen / 4
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else:
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raise ValueError('Bad address format?')
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name = '.'.join(items[:pos])
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zone = '.'.join(items[pos:])
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return unicode(zone), unicode(name)
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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 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 = "grant %(realm)s krb5-self * A; grant %(realm)s krb5-self * AAAA;" % dict(realm=api.env.realm)
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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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ns_ip_address = resolve_host(ns_main)
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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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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(ip_address, ip_prefixlen, ns_hostname=None, ns_ip_address=None,
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ns_replicas=[], update_policy=None, dns_backup=None):
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zone, name = get_reverse_zone(ip_address, ip_prefixlen)
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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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ns_ip_address = resolve_host(ns_main)
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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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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(ip_address, ip_prefixlen, fqdn, dns_backup=None):
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zone, name = get_reverse_zone(ip_address, ip_prefixlen)
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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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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.ip_prefixlen = 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.create_reverse = True
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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, ip_prefixlen, realm_name, domain_name, forwarders, ntp, create_reverse, named_user="named", zonemgr=None):
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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.ip_prefixlen = ip_prefixlen
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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.create_reverse = create_reverse
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if zonemgr:
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self.zonemgr = zonemgr.replace('@','.')
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else:
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self.zonemgr = 'root.%s.%s' % (self.host, self.domain)
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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 not installutils.record_in_hosts(self.ip_address, self.fqdn):
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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):
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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.create_reverse:
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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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def __setup_dns_container(self):
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self._ldap_mod("dns.ldif", self.sub_dict)
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def __setup_zone(self):
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if self.host_domain != self.domain:
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# add DNS domain for host first
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logging.debug("Host domain (%s) is different from DNS domain (%s)!" \
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% (self.host_domain, self.domain))
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logging.debug("Add DNS zone for host first.")
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add_zone(self.host_domain, self.zonemgr, dns_backup=self.dns_backup,
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ns_hostname=api.env.host, ns_ip_address=self.ip_address)
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add_zone(self.domain, self.zonemgr, dns_backup=self.dns_backup,
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ns_hostname=api.env.host, ns_ip_address=self.ip_address)
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def __add_self_ns(self):
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add_ns_rr(self.domain, api.env.host, self.dns_backup, force=True)
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def __add_self(self):
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zone = self.domain
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resource_records = (
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("_ldap._tcp", "SRV", "0 100 389 %s" % self.host),
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("_kerberos", "TXT", self.realm),
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("_kerberos._tcp", "SRV", "0 100 88 %s" % self.host),
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("_kerberos._udp", "SRV", "0 100 88 %s" % self.host),
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("_kerberos-master._tcp", "SRV", "0 100 88 %s" % self.host),
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("_kerberos-master._udp", "SRV", "0 100 88 %s" % self.host),
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("_kpasswd._tcp", "SRV", "0 100 464 %s" % self.host),
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("_kpasswd._udp", "SRV", "0 100 464 %s" % self.host),
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)
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for (host, type, rdata) in resource_records:
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if type == "SRV":
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add_rr(zone, host, type, rdata, self.dns_backup)
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else:
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add_rr(zone, host, type, rdata)
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if self.ntp:
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add_rr(zone, "_ntp._udp", "SRV", "0 100 123 %s" % self.host)
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# Add forward and reverse records to self
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add_fwd_rr(zone, self.host, self.ip_address)
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if dns_zone_exists(get_reverse_zone(self.ip_address, self.ip_prefixlen)[0]):
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add_ptr_rr(self.ip_address, self.ip_prefixlen, self.fqdn)
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def __setup_reverse_zone(self):
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add_reverse_zone(self.ip_address, self.ip_prefixlen, ns_hostname=api.env.host,
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ns_ip_address=self.ip_address, dns_backup=self.dns_backup)
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def __setup_principal(self):
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dns_principal = "DNS/" + self.fqdn + "@" + self.realm
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installutils.kadmin_addprinc(dns_principal)
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# Store the keytab on disk
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self.fstore.backup_file("/etc/named.keytab")
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installutils.create_keytab("/etc/named.keytab", dns_principal)
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p = self.move_service(dns_principal)
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if p is None:
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# the service has already been moved, perhaps we're doing a DNS reinstall
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dns_principal = "krbprincipalname=%s,cn=services,cn=accounts,%s" % (dns_principal, self.suffix)
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else:
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dns_principal = p
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# 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:
|
|
logging.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, ip_prefixlen,
|
|
realm_name, domain_name, ntp=False):
|
|
self.fqdn = fqdn
|
|
self.ip_address = ip_address
|
|
self.ip_prefixlen = ip_prefixlen
|
|
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.__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)
|
|
|
|
ip = netaddr.IPAddress(rdata)
|
|
rzone = ip.reverse_dns
|
|
record = ''
|
|
|
|
while True:
|
|
part, dot, rzone = rzone.partition('.')
|
|
if len(rzone) == 0:
|
|
break
|
|
record = (record + '.' + part).lstrip('.')
|
|
|
|
if dns_zone_exists(rzone):
|
|
del_rr(rzone, record, "PTR", fqdn+".")
|
|
# remove also master NS record from the reverse zone
|
|
del_rr(rzone, "@", "NS", fqdn+".")
|
|
break
|
|
|
|
|
|
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:
|
|
logging.debug(error)
|
|
pass
|
|
|
|
if not enabled is None and not enabled:
|
|
self.chkconfig_off()
|
|
|
|
if not running is None and running:
|
|
self.start()
|