mirror of
https://salsa.debian.org/freeipa-team/freeipa.git
synced 2025-01-05 22:03:01 -06:00
2efc08a6fc
This replace the former ipactl script, as well as replace the current way ipa components are started. Instead of enabling each service in the system init scripts, enable only the ipa script, and then let it start all components based on the configuration read from the LDAP tree. resolves: https://fedorahosted.org/freeipa/ticket/294
428 lines
15 KiB
Python
428 lines
15 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
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 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 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(unattended):
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if unattended:
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return False
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return ipautil.user_input("Do you want to configure the reverse zone?", False)
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def dns_container_exists(fqdn, realm):
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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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suffix = util.realm_to_suffix(realm)
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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):
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tmp = ip_address.split(".")
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tmp.reverse()
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name = tmp.pop(0)
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zone = ".".join(tmp) + ".in-addr.arpa"
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return zone, name
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def add_zone(name, update_policy=None, zonemgr=None, dns_backup=None):
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if not update_policy:
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update_policy = "grant %s krb5-self * A;" % api.env.realm
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try:
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api.Command.dns_add(unicode(name),
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idnssoamname=unicode(api.env.host+"."),
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idnssoarname=unicode(zonemgr),
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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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add_rr(name, "@", "NS", api.env.host+".", dns_backup)
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return name
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def add_reverze_zone(ip_address, update_policy=None, dns_backup=None):
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zone, name = get_reverse_zone(ip_address)
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if not update_policy:
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update_policy = "grant %s krb5-subdomain %s. PTR;" % (api.env.realm, zone)
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try:
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api.Command.dns_add(unicode(zone),
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idnssoamname=unicode(api.env.host+"."),
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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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add_rr(zone, "@", "NS", api.env.host+".", dns_backup)
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return zone
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def add_rr(zone, name, type, rdata, dns_backup=None):
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try:
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api.Command.dns_add_rr(unicode(zone), unicode(name),
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unicode(type), unicode(rdata))
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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_ptr_rr(ip_address, fqdn, dns_backup=None):
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zone, name = get_reverse_zone(ip_address)
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add_rr(zone, name, "PTR", fqdn+".", dns_backup)
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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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api.Command.dns_del_rr(unicode(zone), unicode(host),
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unicode(type), unicode(rdata))
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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.fqdn = 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.create_reverse = False
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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, 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.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.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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tmp = ip_address.split(".")
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tmp.reverse()
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self.reverse_host = tmp.pop(0)
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self.reverse_subnet = ".".join(tmp)
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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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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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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 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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resource_records = (
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(self.host, "A", self.ip_address),
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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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zone = add_zone(self.domain, zonemgr=self.zonemgr, dns_backup=self.dns_backup)
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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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def __setup_reverse_zone(self):
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add_reverze_zone(self.ip_address, dns_backup=self.dns_backup)
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add_ptr_rr(self.ip_address, self.fqdn)
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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
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pent = pwd.getpwnam(self.named_user)
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os.chown("/etc/named.keytab", pent.pw_uid, pent.pw_gid)
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os.chmod("/etc/named.keytab", 0400)
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# modify the principal so that it is marked as an ipa service so that
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# it can host the memberof attribute, then also add it to the
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# dnsserver role group, this way the DNS is allowed to perform
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# DNS Updates
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conn = None
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try:
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conn = ipaldap.IPAdmin("127.0.0.1")
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conn.simple_bind_s("cn=directory manager", self.dm_password)
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except Exception, e:
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logging.critical("Could not connect to the Directory Server on %s" % self.fqdn)
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raise e
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dns_group = "cn=dnsserver,cn=privileges,cn=accounts,%s" % self.suffix
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if isinstance(dns_principal, unicode):
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dns_principal = dns_principal.encode('utf-8')
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mod = [(ldap.MOD_ADD, 'member', dns_principal)]
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try:
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conn.modify_s(dns_group, mod)
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except ldap.TYPE_OR_VALUE_EXISTS:
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pass
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except Exception, e:
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logging.critical("Could not modify principal's %s entry" % dns_principal)
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raise e
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conn.unbind()
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def __setup_named_conf(self):
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self.fstore.backup_file('/etc/named.conf')
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named_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.named.conf.template", self.sub_dict)
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named_fd = open('/etc/named.conf', 'w')
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named_fd.seek(0)
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named_fd.truncate(0)
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named_fd.write(named_txt)
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named_fd.close()
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def __setup_resolv_conf(self):
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self.fstore.backup_file('/etc/resolv.conf')
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resolv_txt = "search "+self.domain+"\nnameserver "+self.ip_address+"\n"
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resolv_fd = open('/etc/resolv.conf', 'w')
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resolv_fd.seek(0)
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resolv_fd.truncate(0)
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resolv_fd.write(resolv_txt)
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resolv_fd.close()
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def uninstall(self):
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if self.is_configured():
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self.print_msg("Unconfiguring %s" % self.service_name)
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running = self.restore_state("running")
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enabled = self.restore_state("enabled")
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self.dns_backup.clear_records(api.Backend.ldap2.isconnected())
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if not running is None:
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self.stop()
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for f in ["/etc/named.conf", "/etc/resolv.conf"]:
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try:
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self.fstore.restore_file(f)
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except ValueError, error:
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logging.debug(error)
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pass
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if not enabled is None and not enabled:
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self.chkconfig_off()
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if not running is None and running:
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self.start()
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