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4e5a68397a102f0be193470257ed331baf57dc3c
freeipa/ipaserver/install/bindinstance.py
T
Martin Nagy 4e5a68397a Use DNS forwarders in /etc/named.conf 
This patch adds options --forwarder and --no-forwarders. At least one of
them must be used if you are doing a setup with DNS server. They are
also mutually exclusive. The --forwarder option can be used more than
once to specify more servers. If the installer runs in interactive mode,
it will prompt the user if none of these option was given at the command
line.
2009-09-02 19:09:28 +02:00

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8.6 KiB
Python
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# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import tempfile
import os
import pwd
import logging
import installutils
import ldap
import service
from ipaserver import ipaldap
from ipapython import sysrestore
from ipapython import ipautil
from ipalib import util
def check_inst():
# So far this file is always present in both RHEL5 and Fedora if all the necessary
# bind packages are installed (RHEL5 requires also the pkg: caching-nameserver)
if not os.path.exists('/etc/named.rfc1912.zones'):
return False
# Also check for the LDAP BIND plug-in
if not os.path.exists('/usr/lib/bind/ldap.so') and \
not os.path.exists('/usr/lib64/bind/ldap.so'):
return False
return True
class BindInstance(service.Service):
def __init__(self, fstore=None, dm_password=None):
service.Service.__init__(self, "named", dm_password=dm_password)
self.named_user = None
self.fqdn = None
self.domain = None
self.host = None
self.ip_address = None
self.realm = None
self.forwarders = None
self.sub_dict = None
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
def setup(self, fqdn, ip_address, realm_name, domain_name, forwarders, named_user="named"):
self.named_user = named_user
self.fqdn = fqdn
self.ip_address = ip_address
self.realm = realm_name
self.domain = domain_name
self.forwarders = forwarders
self.host = fqdn.split(".")[0]
self.suffix = util.realm_to_suffix(self.realm)
tmp = ip_address.split(".")
tmp.reverse()
self.reverse_host = tmp.pop(0)
self.reverse_subnet = ".".join(tmp)
self.__setup_sub_dict()
def create_sample_bind_zone(self):
bind_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.zone.db.template", self.sub_dict)
[bind_fd, bind_name] = tempfile.mkstemp(".db","sample.zone.")
os.write(bind_fd, bind_txt)
os.close(bind_fd)
print "Sample zone file for bind has been created in "+bind_name
def create_instance(self):
try:
self.stop()
except:
pass
self.__add_zone_steps()
self.step("setting up kerberos principal", self.__setup_principal)
self.step("setting up named.conf", self.__setup_named_conf)
self.step("restarting named", self.__start)
self.step("configuring named to start on boot", self.__enable)
self.step("changing resolv.conf to point to ourselves", self.__setup_resolv_conf)
self.start_creation("Configuring named:")
def __add_zone_steps(self):
"""
Add steps necessary to add records and zones, if they don't exist
already.
"""
def object_exists(dn):
"""
Test whether the given object exists in LDAP.
"""
try:
server.search_ext_s(dn, ldap.SCOPE_BASE)
except ldap.NO_SUCH_OBJECT:
return False
else:
return True
zone_dn = "idnsName=%s,cn=dns,%s" % (self.domain, self.suffix)
reverse_zone_dn = "idnsName=%s.in-addr.arpa,cn=dns,%s" % (self.reverse_subnet, self.suffix)
server = ldap.initialize("ldap://" + self.fqdn)
server.simple_bind_s()
if object_exists(zone_dn):
pass # TODO: Add dns records to the zone
else:
self.step("setting up our zone", self.__setup_zone)
if object_exists(reverse_zone_dn):
pass # TODO: Add dns records to the reverse zone
else:
self.step("setting up reverse zone", self.__setup_reverse_zone)
server.unbind_s()
def __start(self):
try:
self.backup_state("running", self.is_running())
self.restart()
except:
print "named service failed to start"
def __enable(self):
self.backup_state("enabled", self.is_running())
self.chkconfig_on()
def __setup_sub_dict(self):
if self.forwarders:
fwds = "\n"
for forwarder in self.forwarders:
fwds += "\t\t%s;\n" % forwarder
fwds += "\t"
else:
fwds = " "
self.sub_dict = dict(FQDN=self.fqdn,
IP=self.ip_address,
DOMAIN=self.domain,
HOST=self.host,
REALM=self.realm,
FORWARDERS=fwds,
SUFFIX=self.suffix,
REVERSE_HOST=self.reverse_host,
REVERSE_SUBNET=self.reverse_subnet)
def __setup_zone(self):
self.backup_state("domain", self.domain)
self._ldap_mod("dns.ldif", self.sub_dict)
def __setup_reverse_zone(self):
self._ldap_mod("dns_reverse.ldif", self.sub_dict)
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)
# 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
conn = None
try:
conn = ipaldap.IPAdmin("127.0.0.1")
conn.simple_bind_s("cn=directory manager", self.dm_password)
except Exception, e:
logging.critical("Could not connect to the Directory Server on %s" % self.fqdn)
raise e
dns_princ_dn = "krbprincipalname=%s,cn=%s,cn=kerberos,%s" % (dns_principal, self.realm, self.suffix)
mod = [(ldap.MOD_ADD, 'objectClass', 'ipaService')]
try:
conn.modify_s(dns_princ_dn, mod)
except Exception, e:
logging.critical("Could not modify principal's %s entry" % dns_principal)
raise e
dns_group = "cn=dnsserver,cn=rolegroups,cn=accounts,%s" % self.suffix
mod = [(ldap.MOD_ADD, 'member', dns_princ_dn)]
try:
conn.modify_s(dns_group, mod)
except Exception, e:
logging.critical("Could not modify principal's %s entry" % dns_principal)
raise e
conn.unbind()
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 uninstall(self):
running = self.restore_state("running")
enabled = self.restore_state("enabled")
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()
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