Coverage for ipaserver/install/bindinstance: 15%

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# Authors: Simo Sorce <ssorce@redhat.com>

# 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, either version 3 of the License, or

# (at your option) any later version.

# 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, see <http://www.gnu.org/licenses/>.

import tempfile

import os

import pwd

import netaddr

import installutils

import ldap

import service

from ipaserver import ipaldap

from ipaserver.install.dsinstance import realm_to_serverid

from ipaserver.install.installutils import resolve_host

from ipapython import sysrestore

from ipapython import ipautil

from ipalib.constants import DNS_ZONE_REFRESH

from ipalib.parameters import IA5Str

from ipalib.util import validate_zonemgr, normalize_zonemgr, gen_dns_update_policy

from ipapython.ipa_log_manager import *

import ipalib

from ipalib import api, util, errors

def check_inst(unattended):

has_bind = True

# 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'):

print "BIND was not found on this system"

print "Please install the 'bind' package and start the installation again"

has_bind = 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'):

print "The BIND LDAP plug-in was not found on this system"

print "Please install the 'bind-dyndb-ldap' package and start the installation again"

has_bind = False

if not has_bind:

return False

if not unattended and os.path.exists('/etc/named.conf'):

msg = "Existing BIND configuration detected, overwrite?"

return ipautil.user_input(msg, False)

return True

def normalize_zone(zone):

if zone[-1] != '.':

return zone + '.'

else:

return zone

def create_reverse():

return ipautil.user_input("Do you want to configure the reverse zone?", True)

def named_conf_exists():

named_fd = open('/etc/named.conf', 'r')

lines = named_fd.readlines()

named_fd.close()

for line in lines:

if line.startswith('dynamic-db "ipa"'):

return True

return False

def dns_container_exists(fqdn, suffix, dm_password=None, ldapi=False, realm=None):

"""

Test whether the dns container exists.

"""

def object_exists(dn):

"""

Test whether the given object exists in LDAP.

"""

try:

conn.search_ext_s(dn, ldap.SCOPE_BASE)

except ldap.NO_SUCH_OBJECT:

return False

else:

return True

try:

# At install time we may need to use LDAPI to avoid chicken/egg

# issues with SSL certs and truting CAs

if ldapi:

conn = ipaldap.IPAdmin(host=fqdn, ldapi=True, realm=realm)

else:

conn = ipaldap.IPAdmin(host=fqdn, port=636, cacert=service.CACERT)

if dm_password:

conn.do_simple_bind(bindpw=dm_password)

else:

conn.do_sasl_gssapi_bind()

except ldap.SERVER_DOWN:

raise RuntimeError('LDAP server on %s is not responding. Is IPA installed?' % fqdn)

ret = object_exists("cn=dns,%s" % suffix)

conn.unbind_s()

return ret

def dns_zone_exists(name):

try:

zone = api.Command.dnszone_show(unicode(name))

except ipalib.errors.NotFound:

return False

if len(zone) == 0:

return False

else:

return True

def get_reverse_record_name(zone, ip_address):

ip = netaddr.IPAddress(ip_address)

rev = '.' + normalize_zone(zone)

fullrev = '.' + normalize_zone(ip.reverse_dns)

if not fullrev.endswith(rev):

raise ValueError("IP address does not match reverse zone")

return fullrev[1:-len(rev)]

def verify_reverse_zone(zone, ip_address):

try:

get_reverse_record_name(zone, ip_address)

except ValueError:

print "Invalid reverse zone %s" % zone

return False

return True

def get_reverse_zone_default(ip_address):

ip = netaddr.IPAddress(ip_address)

items = ip.reverse_dns.split('.')

if ip.version == 4:

items = items[1:] # /24 for IPv4

elif ip.version == 6:

items = items[16:] # /64 for IPv6

return normalize_zone('.'.join(items))

def find_reverse_zone(ip_address):

ip = netaddr.IPAddress(ip_address)

zone = normalize_zone(ip.reverse_dns)

while len(zone) > 0:

if dns_zone_exists(zone):

return zone

foo, bar, zone = zone.partition('.')

return None

def get_reverse_zone(ip_address):

return find_reverse_zone(ip_address) or get_reverse_zone_default(ip_address)

def read_reverse_zone(default, ip_address):

while True:

zone = ipautil.user_input("Please specify the reverse zone name", default=default)

if not zone:

return None

if verify_reverse_zone(zone, ip_address):

break

return normalize_zone(zone)

def add_zone(name, zonemgr=None, dns_backup=None, ns_hostname=None, ns_ip_address=None,

update_policy=None):

if update_policy is None:

update_policy = gen_dns_update_policy(api.env.realm)

if zonemgr is None:

zonemgr = 'hostmaster.%s' % name

if ns_hostname is None:

# automatically retrieve list of DNS masters

dns_masters = api.Object.dnsrecord.get_dns_masters()

if not dns_masters:

raise errors.NotFound("No IPA server with DNS support found!")

ns_main = dns_masters.pop(0)

ns_replicas = dns_masters

addresses = resolve_host(ns_main)

if len(addresses) > 0:

# use the first address

ns_ip_address = addresses[0]

else:

ns_ip_address = None

else:

ns_main = ns_hostname

ns_replicas = []

try:

api.Command.dnszone_add(unicode(name),

idnssoamname=unicode(ns_main+'.'),

idnssoarname=unicode(zonemgr),

ip_address=unicode(ns_ip_address),

idnsallowdynupdate=True,

idnsupdatepolicy=unicode(update_policy),

idnsallowquery=u'any',

idnsallowtransfer=u'none',)

except (errors.DuplicateEntry, errors.EmptyModlist):

pass

nameservers = ns_replicas + [ns_main]

for hostname in nameservers:

add_ns_rr(name, hostname, dns_backup=None, force=True)

def add_reverse_zone(zone, ns_hostname=None, ns_ip_address=None,

ns_replicas=[], update_policy=None, dns_backup=None):

zone = normalize_zone(zone)

if update_policy is None:

update_policy = "grant %s krb5-subdomain %s PTR;" % (api.env.realm, zone)

if ns_hostname is None:

# automatically retrieve list of DNS masters

dns_masters = api.Object.dnsrecord.get_dns_masters()

if not dns_masters:

raise errors.NotFound("No IPA server with DNS support found!")

ns_main = dns_masters.pop(0)

ns_replicas = dns_masters

addresses = resolve_host(ns_main)

if len(addresses) > 0:

# use the first address

ns_ip_address = addresses[0]

else:

ns_ip_address = None

else:

ns_main = ns_hostname

ns_replicas = []

try:

api.Command.dnszone_add(unicode(zone),

idnssoamname=unicode(ns_main+'.'),

idnsallowdynupdate=True,

ip_address=unicode(ns_ip_address),

idnsupdatepolicy=unicode(update_policy),

idnsallowquery=u'any',

idnsallowtransfer=u'none',)

except (errors.DuplicateEntry, errors.EmptyModlist):

pass

nameservers = ns_replicas + [ns_main]

for hostname in nameservers:

add_ns_rr(zone, hostname, dns_backup=None, force=True)

def add_rr(zone, name, type, rdata, dns_backup=None, **kwargs):

addkw = { '%srecord' % str(type.lower()) : unicode(rdata) }

addkw.update(kwargs)

try:

api.Command.dnsrecord_add(unicode(zone), unicode(name), **addkw)

except (errors.DuplicateEntry, errors.EmptyModlist):

pass

if dns_backup:

dns_backup.add(zone, type, name, rdata)

def add_fwd_rr(zone, host, ip_address):

addr = netaddr.IPAddress(ip_address)

if addr.version == 4:

add_rr(zone, host, "A", ip_address)

elif addr.version == 6:

add_rr(zone, host, "AAAA", ip_address)

def add_ptr_rr(zone, ip_address, fqdn, dns_backup=None):

name = get_reverse_record_name(zone, ip_address)

add_rr(zone, name, "PTR", fqdn+".", dns_backup)

def add_ns_rr(zone, hostname, dns_backup=None, force=True):

add_rr(zone, "@", "NS", hostname+'.', dns_backup=dns_backup,

force=force)

def del_rr(zone, name, type, rdata):

delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }

try:

api.Command.dnsrecord_del(unicode(zone), unicode(name), **delkw)

except (errors.NotFound, errors.EmptyModlist):

pass

def get_rr(zone, name, type):

rectype = '%srecord' % unicode(type.lower())

ret = api.Command.dnsrecord_find(unicode(zone), unicode(name))

if ret['count'] > 0:

for r in ret['result']:

if rectype in r:

return r[rectype]

return []

def zonemgr_callback(option, opt_str, value, parser):

"""

Properly validate and convert --zonemgr Option to IA5String

"""

# validate the value first

try:

validate_zonemgr(value)

except ValueError, e:

parser.error("invalid zonemgr: " + unicode(e))

parser.values.zonemgr = value

class DnsBackup(object):

def __init__(self, service):

self.service = service

self.zones = {}

def add(self, zone, record_type, host, rdata):

"""

Backup a DNS record in the file store so it can later be removed.

"""

if zone not in self.zones:

zone_id = len(self.zones)

self.zones[zone] = (zone_id, 0)

self.service.backup_state("dns_zone_%s" % zone_id, zone)

(zone_id, record_id) = self.zones[zone]

self.service.backup_state("dns_record_%s_%s" % (zone_id, record_id),

"%s %s %s" % (record_type, host, rdata))

self.zones[zone] = (zone_id, record_id + 1)

def clear_records(self, have_ldap):

"""

Remove all records from the file store. If we are connected to

ldap, we will also remove them there.

"""

i = 0

while True:

zone = self.service.restore_state("dns_zone_%s" % i)

if not zone:

return

j = 0

while True:

dns_record = self.service.restore_state("dns_record_%s_%s" % (i, j))

if not dns_record:

break

if have_ldap:

type, host, rdata = dns_record.split(" ", 2)

try:

delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }

api.Command.dnsrecord_del(unicode(zone), unicode(host), **delkw)

except:

pass

j += 1

i += 1

class BindInstance(service.Service):

def __init__(self, fstore=None, dm_password=None):

service.Service.__init__(self, "named", dm_password=dm_password)

self.dns_backup = DnsBackup(self)

self.named_user = None

self.domain = None

self.host = None

self.ip_address = None

self.realm = None

self.forwarders = None

self.sub_dict = None

self.reverse_zone = None

self.dm_password = dm_password

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, ntp,

reverse_zone, named_user="named", zonemgr=None,

zone_refresh=DNS_ZONE_REFRESH, zone_notif=False):

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)

self.ntp = ntp

self.reverse_zone = reverse_zone

self.zone_refresh = zone_refresh

self.zone_notif = zone_notif

if not zonemgr:

self.zonemgr = 'hostmaster.%s' % self.domain

else:

self.zonemgr = normalize_zonemgr(zonemgr)

self.__setup_sub_dict()

@property

def host_domain(self):

return '.'.join(self.fqdn.split(".")[1:])

@property

def host_in_rr(self):

# when a host is not in a default domain, it needs to be referred

# with FQDN and not in a domain-relative host name

if not self.host_in_default_domain():

return normalize_zone(self.fqdn)

return self.host

def host_in_default_domain(self):

return normalize_zone(self.host_domain) == normalize_zone(self.domain)

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

# get a connection to the DS

self.ldap_connect()

if installutils.record_in_hosts(self.ip_address, self.fqdn) is None:

installutils.add_record_to_hosts(self.ip_address, self.fqdn)

if not dns_container_exists(self.fqdn, self.suffix, realm=self.realm,

ldapi=True, dm_password=self.dm_password):

self.step("adding DNS container", self.__setup_dns_container)

if dns_zone_exists(self.domain):

self.step("adding NS record to the zone", self.__add_self_ns)

else:

self.step("setting up our zone", self.__setup_zone)

if self.reverse_zone is not None:

self.step("setting up reverse zone", self.__setup_reverse_zone)

self.step("setting up our own record", self.__add_self)

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 __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())

# We do not let the system start IPA components on its own,

# Instead we reply on the IPA init script to start only enabled

# components as found in our LDAP configuration tree

self.ldap_enable('DNS', self.fqdn, self.dm_password, self.suffix)

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 = " "

if self.ntp:

optional_ntp = "\n;ntp server\n"

optional_ntp += "_ntp._udp\t\tIN SRV 0 100 123\t%s""" % self.host_in_rr

else:

optional_ntp = ""

self.sub_dict = dict(FQDN=self.fqdn,

IP=self.ip_address,

DOMAIN=self.domain,

HOST=self.host,

REALM=self.realm,

SERVER_ID=realm_to_serverid(self.realm),

FORWARDERS=fwds,

SUFFIX=self.suffix,

OPTIONAL_NTP=optional_ntp,

ZONEMGR=self.zonemgr,

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 not self.host_in_default_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_in_rr),

("_kerberos", "TXT", self.realm),

("_kerberos._tcp", "SRV", "0 100 88 %s" % self.host_in_rr),

("_kerberos._udp", "SRV", "0 100 88 %s" % self.host_in_rr),

("_kerberos-master._tcp", "SRV", "0 100 88 %s" % self.host_in_rr),

("_kerberos-master._udp", "SRV", "0 100 88 %s" % self.host_in_rr),

("_kpasswd._tcp", "SRV", "0 100 464 %s" % self.host_in_rr),

("_kpasswd._udp", "SRV", "0 100 464 %s" % self.host_in_rr),

)

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_in_rr)

# Add forward and reverse records to self

add_fwd_rr(self.host_domain, 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()

Coverage for ipaserver/install/bindinstance : 15%

443 statements 66 run 377 missing 0 excluded