# Unix SMB/CIFS implementation.
# backend code for provisioning DNS for a Samba4 server
#
# Copyright (C) Kai Blin <kai@samba.org> 2011
# Copyright (C) Amitay Isaacs <amitay@gmail.com> 2011
#
# 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/>.
#
"""DNS-related provisioning"""
import os
import uuid
import shutil
import time
import ldb
from base64 import b64encode
import samba
from samba.ndr import ndr_pack, ndr_unpack
from samba import setup_file
from samba.dcerpc import dnsp, misc, security
from samba.dsdb import (
DS_DOMAIN_FUNCTION_2000,
DS_DOMAIN_FUNCTION_2003,
DS_DOMAIN_FUNCTION_2008_R2
)
from samba.provision.descriptor import (
get_domain_descriptor,
get_dns_partition_descriptor
)
from samba.provision.common import (
setup_path,
setup_add_ldif,
setup_modify_ldif,
setup_ldb
)
def get_domainguid(samdb, domaindn):
res = samdb.search(base=domaindn, scope=ldb.SCOPE_BASE, attrs=["objectGUID"])
domainguid = str(ndr_unpack(misc.GUID, res[0]["objectGUID"][0]))
return domainguid
def get_dnsadmins_sid(samdb, domaindn):
res = samdb.search(base="CN=DnsAdmins,CN=Users,%s" % domaindn, scope=ldb.SCOPE_BASE,
attrs=["objectSid"])
dnsadmins_sid = ndr_unpack(security.dom_sid, res[0]["objectSid"][0])
return dnsadmins_sid
class ARecord(dnsp.DnssrvRpcRecord):
def __init__(self, ip_addr, serial=1, ttl=900, rank=dnsp.DNS_RANK_ZONE):
super(ARecord, self).__init__()
self.wType = dnsp.DNS_TYPE_A
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
self.data = ip_addr
class AAAARecord(dnsp.DnssrvRpcRecord):
def __init__(self, ip6_addr, serial=1, ttl=900, rank=dnsp.DNS_RANK_ZONE):
super(AAAARecord, self).__init__()
self.wType = dnsp.DNS_TYPE_AAAA
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
self.data = ip6_addr
class CNameRecord(dnsp.DnssrvRpcRecord):
def __init__(self, cname, serial=1, ttl=900, rank=dnsp.DNS_RANK_ZONE):
super(CNameRecord, self).__init__()
self.wType = dnsp.DNS_TYPE_CNAME
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
self.data = cname
class NSRecord(dnsp.DnssrvRpcRecord):
def __init__(self, dns_server, serial=1, ttl=900, rank=dnsp.DNS_RANK_ZONE):
super(NSRecord, self).__init__()
self.wType = dnsp.DNS_TYPE_NS
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
self.data = dns_server
class SOARecord(dnsp.DnssrvRpcRecord):
def __init__(self, mname, rname, serial=1, refresh=900, retry=600,
expire=86400, minimum=3600, ttl=3600, rank=dnsp.DNS_RANK_ZONE):
super(SOARecord, self).__init__()
self.wType = dnsp.DNS_TYPE_SOA
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
soa = dnsp.soa()
soa.serial = serial
soa.refresh = refresh
soa.retry = retry
soa.expire = expire
soa.mname = mname
soa.rname = rname
self.data = soa
class SRVRecord(dnsp.DnssrvRpcRecord):
def __init__(self, target, port, priority=0, weight=100, serial=1, ttl=900,
rank=dnsp.DNS_RANK_ZONE):
super(SRVRecord, self).__init__()
self.wType = dnsp.DNS_TYPE_SRV
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
srv = dnsp.srv()
srv.nameTarget = target
srv.wPort = port
srv.wPriority = priority
srv.wWeight = weight
self.data = srv
class TXTRecord(dnsp.DnssrvRpcRecord):
def __init__(self, slist, serial=1, ttl=900, rank=dnsp.DNS_RANK_ZONE):
super(TXTRecord, self).__init__()
self.wType = dnsp.DNS_TYPE_TXT
self.rank = rank
self.dwSerial = serial
self.dwTtlSeconds = ttl
stringlist = dnsp.string_list()
stringlist.count = len(slist)
stringlist.str = slist
self.data = stringlist
class TypeProperty(dnsp.DnsProperty):
def __init__(self, zone_type=dnsp.DNS_ZONE_TYPE_PRIMARY):
super(TypeProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_TYPE
self.data = zone_type
class AllowUpdateProperty(dnsp.DnsProperty):
def __init__(self, allow_update=dnsp.DNS_ZONE_UPDATE_SECURE):
super(AllowUpdateProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_ALLOW_UPDATE
self.data = allow_update
class SecureTimeProperty(dnsp.DnsProperty):
def __init__(self, secure_time=0):
super(SecureTimeProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_SECURE_TIME
self.data = secure_time
class NorefreshIntervalProperty(dnsp.DnsProperty):
def __init__(self, norefresh_interval=0):
super(NorefreshIntervalProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_NOREFRESH_INTERVAL
self.data = norefresh_interval
class RefreshIntervalProperty(dnsp.DnsProperty):
def __init__(self, refresh_interval=0):
super(RefreshIntervalProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_REFRESH_INTERVAL
self.data = refresh_interval
class AgingStateProperty(dnsp.DnsProperty):
def __init__(self, aging_enabled=0):
super(AgingStateProperty, self).__init__()
self.wDataLength = 1
self.version = 1
self.id = dnsp.DSPROPERTY_ZONE_AGING_STATE
self.data = aging_enabled
class AgingEnabledTimeProperty(dnsp.DnsProperty):
def __init__(self, next_cycle_hours=0):
super(AgingEnabledTimeProperty, self).__init__()
self.wDataLength = 1
self.version = 1;
self.id = dnsp.DSPROPERTY_ZONE_AGING_ENABLED_TIME
self.data = next_cycle_hours
def setup_dns_partitions(samdb, domainsid, domaindn, forestdn, configdn,
serverdn):
domainzone_dn = "DC=DomainDnsZones,%s" % domaindn
forestzone_dn = "DC=ForestDnsZones,%s" % forestdn
descriptor = get_dns_partition_descriptor(domainsid)
setup_add_ldif(samdb, setup_path("provision_dnszones_partitions.ldif"), {
"DOMAINZONE_DN": domainzone_dn,
"FORESTZONE_DN": forestzone_dn,
"SECDESC" : b64encode(descriptor)
})
domainzone_guid = get_domainguid(samdb, domainzone_dn)
forestzone_guid = get_domainguid(samdb, forestzone_dn)
domainzone_guid = str(uuid.uuid4())
forestzone_guid = str(uuid.uuid4())
domainzone_dns = ldb.Dn(samdb, domainzone_dn).canonical_ex_str().strip()
forestzone_dns = ldb.Dn(samdb, forestzone_dn).canonical_ex_str().strip()
setup_add_ldif(samdb, setup_path("provision_dnszones_add.ldif"), {
"DOMAINZONE_DN": domainzone_dn,
"FORESTZONE_DN": forestzone_dn,
"DOMAINZONE_GUID": domainzone_guid,
"FORESTZONE_GUID": forestzone_guid,
"DOMAINZONE_DNS": domainzone_dns,
"FORESTZONE_DNS": forestzone_dns,
"CONFIGDN": configdn,
"SERVERDN": serverdn,
})
setup_modify_ldif(samdb, setup_path("provision_dnszones_modify.ldif"), {
"CONFIGDN": configdn,
"SERVERDN": serverdn,
"DOMAINZONE_DN": domainzone_dn,
"FORESTZONE_DN": forestzone_dn,
})
def add_dns_accounts(samdb, domaindn):
setup_add_ldif(samdb, setup_path("provision_dns_accounts_add.ldif"), {
"DOMAINDN": domaindn,
})
def add_dns_container(samdb, domaindn, prefix, domainsid, dnsadmins_sid):
# CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
sddl = "O:SYG:SYD:AI" \
"(A;;RPWPCRCCDCLCLORCWOWDSDDTSW;;;DA)" \
"(A;CI;RPWPCRCCDCLCRCWOWDSDDTSW;;;%s)" \
"(A;;RPWPCRCCDCLCLORCWOWDSDDTSW;;;SY)" \
"(A;CI;RPWPCRCCDCLCRCWOWDSDDTSW;;;ED)" \
"S:AI" % dnsadmins_sid
sec = security.descriptor.from_sddl(sddl, domainsid)
msg = ldb.Message(ldb.Dn(samdb, "CN=MicrosoftDNS,%s,%s" % (prefix, domaindn)))
msg["objectClass"] = ["top", "container"]
msg["nTSecurityDescriptor"] = ldb.MessageElement(ndr_pack(sec), ldb.FLAG_MOD_ADD,
"nTSecurityDescriptor")
samdb.add(msg)
def add_rootservers(samdb, domaindn, prefix):
rootservers = {}
rootservers["a.root-servers.net"] = "198.41.0.4"
rootservers["b.root-servers.net"] = "192.228.79.201"
rootservers["c.root-servers.net"] = "192.33.4.12"
rootservers["d.root-servers.net"] = "128.8.10.90"
rootservers["e.root-servers.net"] = "192.203.230.10"
rootservers["f.root-servers.net"] = "192.5.5.241"
rootservers["g.root-servers.net"] = "192.112.36.4"
rootservers["h.root-servers.net"] = "128.63.2.53"
rootservers["i.root-servers.net"] = "192.36.148.17"
rootservers["j.root-servers.net"] = "192.58.128.30"
rootservers["k.root-servers.net"] = "193.0.14.129"
rootservers["l.root-servers.net"] = "199.7.83.42"
rootservers["m.root-servers.net"] = "202.12.27.33"
rootservers_v6 = {}
rootservers_v6["a.root-servers.net"] = "2001:503:ba3e::2:30"
rootservers_v6["f.root-servers.net"] = "2001:500:2f::f"
rootservers_v6["h.root-servers.net"] = "2001:500:1::803f:235"
rootservers_v6["j.root-servers.net"] = "2001:503:c27::2:30"
rootservers_v6["k.root-servers.net"] = "2001:7fd::1"
rootservers_v6["m.root-servers.net"] = "2001:dc3::35"
container_dn = "DC=RootDNSServers,CN=MicrosoftDNS,%s,%s" % (prefix, domaindn)
# Add DC=RootDNSServers,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
msg = ldb.Message(ldb.Dn(samdb, container_dn))
props = []
props.append(ndr_pack(TypeProperty(zone_type=dnsp.DNS_ZONE_TYPE_CACHE)))
props.append(ndr_pack(AllowUpdateProperty(allow_update=dnsp.DNS_ZONE_UPDATE_OFF)))
props.append(ndr_pack(SecureTimeProperty()))
props.append(ndr_pack(NorefreshIntervalProperty()))
props.append(ndr_pack(RefreshIntervalProperty()))
props.append(ndr_pack(AgingStateProperty()))
props.append(ndr_pack(AgingEnabledTimeProperty()))
msg["objectClass"] = ["top", "dnsZone"]
msg["cn"] = ldb.MessageElement("Zone", ldb.FLAG_MOD_ADD, "cn")
msg["dNSProperty"] = ldb.MessageElement(props, ldb.FLAG_MOD_ADD, "dNSProperty")
samdb.add(msg)
# Add DC=@,DC=RootDNSServers,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
record = []
for rserver in rootservers:
record.append(ndr_pack(NSRecord(rserver, serial=0, ttl=0, rank=dnsp.DNS_RANK_ROOT_HINT)))
msg = ldb.Message(ldb.Dn(samdb, "DC=@,%s" % container_dn))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(record, ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
# Add DC=<rootserver>,DC=RootDNSServers,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
for rserver in rootservers:
record = [ndr_pack(ARecord(rootservers[rserver], serial=0, ttl=0, rank=dnsp.DNS_RANK_ROOT_HINT))]
# Add AAAA record as well (How does W2K* add IPv6 records?)
#if rserver in rootservers_v6:
# record.append(ndr_pack(AAAARecord(rootservers_v6[rserver], serial=0, ttl=0)))
msg = ldb.Message(ldb.Dn(samdb, "DC=%s,%s" % (rserver, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(record, ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_at_record(samdb, container_dn, prefix, hostname, dnsdomain, hostip, hostip6):
fqdn_hostname = "%s.%s" % (hostname, dnsdomain)
at_records = []
# SOA record
at_soa_record = SOARecord(fqdn_hostname, "hostmaster.%s" % dnsdomain)
at_records.append(ndr_pack(at_soa_record))
# NS record
at_ns_record = NSRecord(fqdn_hostname)
at_records.append(ndr_pack(at_ns_record))
if hostip is not None:
# A record
at_a_record = ARecord(hostip)
at_records.append(ndr_pack(at_a_record))
if hostip6 is not None:
# AAAA record
at_aaaa_record = AAAARecord(hostip6)
at_records.append(ndr_pack(at_aaaa_record))
msg = ldb.Message(ldb.Dn(samdb, "DC=@,%s" % container_dn))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(at_records, ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_srv_record(samdb, container_dn, prefix, host, port):
srv_record = SRVRecord(host, port)
msg = ldb.Message(ldb.Dn(samdb, "%s,%s" % (prefix, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(ndr_pack(srv_record), ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_ns_record(samdb, container_dn, prefix, host):
ns_record = NSRecord(host)
msg = ldb.Message(ldb.Dn(samdb, "%s,%s" % (prefix, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(ndr_pack(ns_record), ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_ns_glue_record(samdb, container_dn, prefix, host):
ns_record = NSRecord(host, rank=dnsp.DNS_RANK_NS_GLUE)
msg = ldb.Message(ldb.Dn(samdb, "%s,%s" % (prefix, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(ndr_pack(ns_record), ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_cname_record(samdb, container_dn, prefix, host):
cname_record = CNameRecord(host)
msg = ldb.Message(ldb.Dn(samdb, "%s,%s" % (prefix, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(ndr_pack(cname_record), ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_host_record(samdb, container_dn, prefix, hostip, hostip6):
host_records = []
if hostip:
a_record = ARecord(hostip)
host_records.append(ndr_pack(a_record))
if hostip6:
aaaa_record = AAAARecord(hostip6)
host_records.append(ndr_pack(aaaa_record))
if host_records:
msg = ldb.Message(ldb.Dn(samdb, "%s,%s" % (prefix, container_dn)))
msg["objectClass"] = ["top", "dnsNode"]
msg["dnsRecord"] = ldb.MessageElement(host_records, ldb.FLAG_MOD_ADD, "dnsRecord")
samdb.add(msg)
def add_domain_record(samdb, domaindn, prefix, dnsdomain, domainsid, dnsadmins_sid):
# DC=<DNSDOMAIN>,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
sddl = "O:SYG:BAD:AI" \
"(A;;RPWPCRCCDCLCLORCWOWDSDDTSW;;;DA)" \
"(A;;CC;;;AU)" \
"(A;;RPLCLORC;;;WD)" \
"(A;;RPWPCRCCDCLCLORCWOWDSDDTSW;;;SY)" \
"(A;CI;RPWPCRCCDCLCRCWOWDSDDTSW;;;ED)" \
"(A;CIID;RPWPCRCCDCLCRCWOWDSDDTSW;;;%s)" \
"(A;CIID;RPWPCRCCDCLCRCWOWDSDDTSW;;;ED)" \
"(OA;CIID;RPWPCR;91e647de-d96f-4b70-9557-d63ff4f3ccd8;;PS)" \
"(A;CIID;RPWPCRCCDCLCLORCWOWDSDDTSW;;;EA)" \
"(A;CIID;LC;;;RU)" \
"(A;CIID;RPWPCRCCLCLORCWOWDSDSW;;;BA)" \
"S:AI" % dnsadmins_sid
sec = security.descriptor.from_sddl(sddl, domainsid)
props = []
props.append(ndr_pack(TypeProperty()))
props.append(ndr_pack(AllowUpdateProperty()))
props.append(ndr_pack(SecureTimeProperty()))
props.append(ndr_pack(NorefreshIntervalProperty(norefresh_interval=168)))
props.append(ndr_pack(RefreshIntervalProperty(refresh_interval=168)))
props.append(ndr_pack(AgingStateProperty()))
props.append(ndr_pack(AgingEnabledTimeProperty()))
msg = ldb.Message(ldb.Dn(samdb, "DC=%s,CN=MicrosoftDNS,%s,%s" % (dnsdomain, prefix, domaindn)))
msg["objectClass"] = ["top", "dnsZone"]
msg["ntSecurityDescriptor"] = ldb.MessageElement(ndr_pack(sec), ldb.FLAG_MOD_ADD,
"nTSecurityDescriptor")
msg["dNSProperty"] = ldb.MessageElement(props, ldb.FLAG_MOD_ADD, "dNSProperty")
samdb.add(msg)
def add_msdcs_record(samdb, forestdn, prefix, dnsforest):
# DC=_msdcs.<DNSFOREST>,CN=MicrosoftDNS,<PREFIX>,<FORESTDN>
msg = ldb.Message(ldb.Dn(samdb, "DC=_msdcs.%s,CN=MicrosoftDNS,%s,%s" %
(dnsforest, prefix, forestdn)))
msg["objectClass"] = ["top", "dnsZone"]
samdb.add(msg)
def add_dc_domain_records(samdb, domaindn, prefix, site, dnsdomain, hostname,
hostip, hostip6):
fqdn_hostname = "%s.%s" % (hostname, dnsdomain)
# Set up domain container - DC=<DNSDOMAIN>,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
domain_container_dn = ldb.Dn(samdb, "DC=%s,CN=MicrosoftDNS,%s,%s" %
(dnsdomain, prefix, domaindn))
# DC=@ record
add_at_record(samdb, domain_container_dn, "DC=@", hostname, dnsdomain,
hostip, hostip6)
# DC=<HOSTNAME> record
add_host_record(samdb, domain_container_dn, "DC=%s" % hostname, hostip,
hostip6)
# DC=_kerberos._tcp record
add_srv_record(samdb, domain_container_dn, "DC=_kerberos._tcp",
fqdn_hostname, 88)
# DC=_kerberos._tcp.<SITENAME>._sites record
add_srv_record(samdb, domain_container_dn, "DC=_kerberos._tcp.%s._sites" %
site, fqdn_hostname, 88)
# DC=_kerberos._udp record
add_srv_record(samdb, domain_container_dn, "DC=_kerberos._udp",
fqdn_hostname, 88)
# DC=_kpasswd._tcp record
add_srv_record(samdb, domain_container_dn, "DC=_kpasswd._tcp",
fqdn_hostname, 464)
# DC=_kpasswd._udp record
add_srv_record(samdb, domain_container_dn, "DC=_kpasswd._udp",
fqdn_hostname, 464)
# DC=_ldap._tcp record
add_srv_record(samdb, domain_container_dn, "DC=_ldap._tcp", fqdn_hostname,
389)
# DC=_ldap._tcp.<SITENAME>._sites record
add_srv_record(samdb, domain_container_dn, "DC=_ldap._tcp.%s._sites" %
site, fqdn_hostname, 389)
# FIXME: The number of SRV records depend on the various roles this DC has.
# _gc and _msdcs records are added if the we are the forest dc and not subdomain dc
#
# Assumption: current DC is GC and add all the entries
# DC=_gc._tcp record
add_srv_record(samdb, domain_container_dn, "DC=_gc._tcp", fqdn_hostname,
3268)
# DC=_gc._tcp.<SITENAME>,_sites record
add_srv_record(samdb, domain_container_dn, "DC=_gc._tcp.%s._sites" % site,
fqdn_hostname, 3268)
# DC=_msdcs record
add_ns_glue_record(samdb, domain_container_dn, "DC=_msdcs", fqdn_hostname)
# FIXME: Following entries are added only if DomainDnsZones and ForestDnsZones partitions
# are created
#
# Assumption: Additional entries won't hurt on os_level = 2000
# DC=_ldap._tcp.<SITENAME>._sites.DomainDnsZones
add_srv_record(samdb, domain_container_dn,
"DC=_ldap._tcp.%s._sites.DomainDnsZones" % site, fqdn_hostname,
389)
# DC=_ldap._tcp.<SITENAME>._sites.ForestDnsZones
add_srv_record(samdb, domain_container_dn,
"DC=_ldap._tcp.%s._sites.ForestDnsZones" % site, fqdn_hostname,
389)
# DC=_ldap._tcp.DomainDnsZones
add_srv_record(samdb, domain_container_dn, "DC=_ldap._tcp.DomainDnsZones",
fqdn_hostname, 389)
# DC=_ldap._tcp.ForestDnsZones
add_srv_record(samdb, domain_container_dn, "DC=_ldap._tcp.ForestDnsZones",
fqdn_hostname, 389)
# DC=DomainDnsZones
add_host_record(samdb, domain_container_dn, "DC=DomainDnsZones", hostip,
hostip6)
# DC=ForestDnsZones
add_host_record(samdb, domain_container_dn, "DC=ForestDnsZones", hostip,
hostip6)
def add_dc_msdcs_records(samdb, forestdn, prefix, site, dnsforest, hostname,
hostip, hostip6, domainguid, ntdsguid):
fqdn_hostname = "%s.%s" % (hostname, dnsforest)
# Set up forest container - DC=<DNSDOMAIN>,CN=MicrosoftDNS,<PREFIX>,<DOMAINDN>
forest_container_dn = ldb.Dn(samdb, "DC=_msdcs.%s,CN=MicrosoftDNS,%s,%s" %
(dnsforest, prefix, forestdn))
# DC=@ record
add_at_record(samdb, forest_container_dn, "DC=@", hostname, dnsforest,
None, None)
# DC=_kerberos._tcp.dc record
add_srv_record(samdb, forest_container_dn, "DC=_kerberos._tcp.dc",
fqdn_hostname, 88)
# DC=_kerberos._tcp.<SITENAME>._sites.dc record
add_srv_record(samdb, forest_container_dn,
"DC=_kerberos._tcp.%s._sites.dc" % site, fqdn_hostname, 88)
# DC=_ldap._tcp.dc record
add_srv_record(samdb, forest_container_dn, "DC=_ldap._tcp.dc",
fqdn_hostname, 389)
# DC=_ldap._tcp.<SITENAME>._sites.dc record
add_srv_record(samdb, forest_container_dn, "DC=_ldap._tcp.%s._sites.dc" %
site, fqdn_hostname, 389)
# DC=_ldap._tcp.<SITENAME>._sites.gc record
add_srv_record(samdb, forest_container_dn, "DC=_ldap._tcp.%s._sites.gc" %
site, fqdn_hostname, 3268)
# DC=_ldap._tcp.gc record
add_srv_record(samdb, forest_container_dn, "DC=_ldap._tcp.gc",
fqdn_hostname, 3268)
# DC=_ldap._tcp.pdc record
add_srv_record(samdb, forest_container_dn, "DC=_ldap._tcp.pdc",
fqdn_hostname, 389)
# DC=gc record
add_host_record(samdb, forest_container_dn, "DC=gc", hostip, hostip6)
# DC=_ldap._tcp.<DOMAINGUID>.domains record
add_srv_record(samdb, forest_container_dn,
"DC=_ldap._tcp.%s.domains" % domainguid, fqdn_hostname, 389)
# DC=<NTDSGUID>
add_cname_record(samdb, forest_container_dn, "DC=%s" % ntdsguid,
fqdn_hostname)
def secretsdb_setup_dns(secretsdb, names, private_dir, realm,
dnsdomain, dns_keytab_path, dnspass):
"""Add DNS specific bits to a secrets database.
:param secretsdb: Ldb Handle to the secrets database
:param names: Names shortcut
:param machinepass: Machine password
"""
try:
os.unlink(os.path.join(private_dir, dns_keytab_path))
except OSError:
pass
setup_ldb(secretsdb, setup_path("secrets_dns.ldif"), {
"REALM": realm,
"DNSDOMAIN": dnsdomain,
"DNS_KEYTAB": dns_keytab_path,
"DNSPASS_B64": b64encode(dnspass),
"HOSTNAME": names.hostname,
"DNSNAME" : '%s.%s' % (
names.netbiosname.lower(), names.dnsdomain.lower())
})
def create_dns_dir(logger, paths):
"""Write out a DNS zone file, from the info in the current database.
:param logger: Logger object
:param paths: paths object
"""
dns_dir = os.path.dirname(paths.dns)
try:
shutil.rmtree(dns_dir, True)
except OSError:
pass
os.mkdir(dns_dir, 0770)
if paths.bind_gid is not None:
try:
os.chown(dns_dir, -1, paths.bind_gid)
# chmod needed to cope with umask
os.chmod(dns_dir, 0770)
except OSError:
if not os.environ.has_key('SAMBA_SELFTEST'):
logger.error("Failed to chown %s to bind gid %u" % (
dns_dir, paths.bind_gid))
def create_zone_file(lp, logger, paths, targetdir, dnsdomain,
hostip, hostip6, hostname, realm, domainguid,
ntdsguid, site):
"""Write out a DNS zone file, from the info in the current database.
:param paths: paths object
:param dnsdomain: DNS Domain name
:param domaindn: DN of the Domain
:param hostip: Local IPv4 IP
:param hostip6: Local IPv6 IP
:param hostname: Local hostname
:param realm: Realm name
:param domainguid: GUID of the domain.
:param ntdsguid: GUID of the hosts nTDSDSA record.
"""
assert isinstance(domainguid, str)
if hostip6 is not None:
hostip6_base_line = " IN AAAA " + hostip6
hostip6_host_line = hostname + " IN AAAA " + hostip6
gc_msdcs_ip6_line = "gc._msdcs IN AAAA " + hostip6
else:
hostip6_base_line = ""
hostip6_host_line = ""
gc_msdcs_ip6_line = ""
if hostip is not None:
hostip_base_line = " IN A " + hostip
hostip_host_line = hostname + " IN A " + hostip
gc_msdcs_ip_line = "gc._msdcs IN A " + hostip
else:
hostip_base_line = ""
hostip_host_line = ""
gc_msdcs_ip_line = ""
# we need to freeze the zone while we update the contents
if targetdir is None:
rndc = ' '.join(lp.get("rndc command"))
os.system(rndc + " freeze " + lp.get("realm"))
setup_file(setup_path("provision.zone"), paths.dns, {
"HOSTNAME": hostname,
"DNSDOMAIN": dnsdomain,
"REALM": realm,
"HOSTIP_BASE_LINE": hostip_base_line,
"HOSTIP_HOST_LINE": hostip_host_line,
"DOMAINGUID": domainguid,
"DATESTRING": time.strftime("%Y%m%d%H"),
"DEFAULTSITE": site,
"NTDSGUID": ntdsguid,
"HOSTIP6_BASE_LINE": hostip6_base_line,
"HOSTIP6_HOST_LINE": hostip6_host_line,
"GC_MSDCS_IP_LINE": gc_msdcs_ip_line,
"GC_MSDCS_IP6_LINE": gc_msdcs_ip6_line,
})
if paths.bind_gid is not None:
try:
os.chown(paths.dns, -1, paths.bind_gid)
# chmod needed to cope with umask
os.chmod(paths.dns, 0664)
except OSError:
if not os.environ.has_key('SAMBA_SELFTEST'):
logger.error("Failed to chown %s to bind gid %u" % (
paths.dns, paths.bind_gid))
if targetdir is None:
os.system(rndc + " unfreeze " + lp.get("realm"))
def tdb_copy(logger, file1, file2):
"""Copy tdb file using tdbbackup utility and rename it
"""
# Find the location of tdbbackup tool
dirs = ["bin", samba.param.bin_dir()] + os.getenv('PATH').split(os.pathsep)
for d in dirs:
toolpath = os.path.join(d, "tdbbackup")
if os.path.exists(toolpath):
break
status = os.system("%s -s '.dns' %s" % (toolpath, file1))
if status == 0:
os.rename("%s.dns" % file1, file2)
else:
raise Exception("Error copying %s" % file1)
def create_samdb_copy(samdb, logger, paths, names, domainsid, domainguid):
"""Create a copy of samdb and give write permissions to named for dns partitions
"""
private_dir = paths.private_dir
samldb_dir = os.path.join(private_dir, "sam.ldb.d")
dns_dir = os.path.dirname(paths.dns)
dns_samldb_dir = os.path.join(dns_dir, "sam.ldb.d")
# Find the partitions and corresponding filenames
partfile = {}
res = samdb.search(base="@PARTITION", scope=ldb.SCOPE_BASE, attrs=["partition"])
for tmp in res[0]["partition"]:
(nc, fname) = tmp.split(':')
partfile[nc.upper()] = fname
# Create empty domain partition
domaindn = names.domaindn.upper()
domainpart_file = os.path.join(dns_dir, partfile[domaindn])
try:
os.mkdir(dns_samldb_dir)
file(domainpart_file, 'w').close()
# Fill the basedn and @OPTION records in domain partition
dom_ldb = samba.Ldb(domainpart_file)
domainguid_line = "objectGUID: %s\n-" % domainguid
descr = b64encode(get_domain_descriptor(domainsid))
setup_add_ldif(dom_ldb, setup_path("provision_basedn.ldif"), {
"DOMAINDN" : names.domaindn,
"DOMAINGUID" : domainguid_line,
"DOMAINSID" : str(domainsid),
"DESCRIPTOR" : descr})
setup_add_ldif(dom_ldb,
setup_path("provision_basedn_options.ldif"), None)
except:
logger.error(
"Failed to setup database for BIND, AD based DNS cannot be used")
raise
del partfile[domaindn]
# Link dns partitions and metadata
domainzonedn = "DC=DOMAINDNSZONES,%s" % names.domaindn.upper()
forestzonedn = "DC=FORESTDNSZONES,%s" % names.rootdn.upper()
domainzone_file = partfile[domainzonedn]
forestzone_file = partfile[forestzonedn]
metadata_file = "metadata.tdb"
try:
os.link(os.path.join(samldb_dir, metadata_file),
os.path.join(dns_samldb_dir, metadata_file))
os.link(os.path.join(private_dir, domainzone_file),
os.path.join(dns_dir, domainzone_file))
os.link(os.path.join(private_dir, forestzone_file),
os.path.join(dns_dir, forestzone_file))
except OSError:
logger.error(
"Failed to setup database for BIND, AD based DNS cannot be used")
raise
del partfile[domainzonedn]
del partfile[forestzonedn]
# Copy root, config, schema partitions (and any other if any)
# Since samdb is open in the current process, copy them in a child process
try:
tdb_copy(logger,
os.path.join(private_dir, "sam.ldb"),
os.path.join(dns_dir, "sam.ldb"))
for nc in partfile:
pfile = partfile[nc]
tdb_copy(logger,
os.path.join(private_dir, pfile),
os.path.join(dns_dir, pfile))
except:
logger.error(
"Failed to setup database for BIND, AD based DNS cannot be used")
raise
# Give bind read/write permissions dns partitions
if paths.bind_gid is not None:
try:
os.chown(samldb_dir, -1, paths.bind_gid)
os.chmod(samldb_dir, 0750)
for dirname, dirs, files in os.walk(dns_dir):
for d in dirs:
dpath = os.path.join(dirname, d)
os.chown(dpath, -1, paths.bind_gid)
os.chmod(dpath, 0770)
for f in files:
if f.endswith('.ldb') or f.endswith('.tdb'):
fpath = os.path.join(dirname, f)
os.chown(fpath, -1, paths.bind_gid)
os.chmod(fpath, 0660)
except OSError:
if not os.environ.has_key('SAMBA_SELFTEST'):
logger.error(
"Failed to set permissions to sam.ldb* files, fix manually")
else:
if not os.environ.has_key('SAMBA_SELFTEST'):
logger.warning("""Unable to find group id for BIND,
set permissions to sam.ldb* files manually""")
def create_dns_update_list(lp, logger, paths):
"""Write out a dns_update_list file"""
# note that we use no variable substitution on this file
# the substitution is done at runtime by samba_dnsupdate, samba_spnupdate
setup_file(setup_path("dns_update_list"), paths.dns_update_list, None)
setup_file(setup_path("spn_update_list"), paths.spn_update_list, None)
def create_named_conf(paths, realm, dnsdomain, dns_backend):
"""Write out a file containing zone statements suitable for inclusion in a
named.conf file (including GSS-TSIG configuration).
:param paths: all paths
:param realm: Realm name
:param dnsdomain: DNS Domain name
:param dns_backend: DNS backend type
:param keytab_name: File name of DNS keytab file
"""
if dns_backend == "BIND9_FLATFILE":
setup_file(setup_path("named.conf"), paths.namedconf, {
"DNSDOMAIN": dnsdomain,
"REALM": realm,
"ZONE_FILE": paths.dns,
"REALM_WC": "*." + ".".join(realm.split(".")[1:]),
"NAMED_CONF": paths.namedconf,
"NAMED_CONF_UPDATE": paths.namedconf_update
})
setup_file(setup_path("named.conf.update"), paths.namedconf_update)
elif dns_backend == "BIND9_DLZ":
setup_file(setup_path("named.conf.dlz"), paths.namedconf, {
"NAMED_CONF": paths.namedconf,
"MODULESDIR" : samba.param.modules_dir(),
})
def create_named_txt(path, realm, dnsdomain, dnsname, private_dir,
keytab_name):
"""Write out a file containing zone statements suitable for inclusion in a
named.conf file (including GSS-TSIG configuration).
:param path: Path of the new named.conf file.
:param realm: Realm name
:param dnsdomain: DNS Domain name
:param private_dir: Path to private directory
:param keytab_name: File name of DNS keytab file
"""
setup_file(setup_path("named.txt"), path, {
"DNSDOMAIN": dnsdomain,
"DNSNAME" : dnsname,
"REALM": realm,
"DNS_KEYTAB": keytab_name,
"DNS_KEYTAB_ABS": os.path.join(private_dir, keytab_name),
"PRIVATE_DIR": private_dir
})
def is_valid_dns_backend(dns_backend):
return dns_backend in ("BIND9_FLATFILE", "BIND9_DLZ", "SAMBA_INTERNAL", "NONE")
def is_valid_os_level(os_level):
return DS_DOMAIN_FUNCTION_2000 <= os_level <= DS_DOMAIN_FUNCTION_2008_R2
def create_dns_legacy(samdb, domainsid, forestdn, dnsadmins_sid):
# Set up MicrosoftDNS container
add_dns_container(samdb, forestdn, "CN=System", domainsid, dnsadmins_sid)
# Add root servers
add_rootservers(samdb, forestdn, "CN=System")
def fill_dns_data_legacy(samdb, domainsid, forestdn, dnsdomain, site, hostname,
hostip, hostip6, dnsadmins_sid):
# Add domain record
add_domain_record(samdb, forestdn, "CN=System", dnsdomain, domainsid,
dnsadmins_sid)
# Add DNS records for a DC in domain
add_dc_domain_records(samdb, forestdn, "CN=System", site, dnsdomain,
hostname, hostip, hostip6)
def create_dns_partitions(samdb, domainsid, names, domaindn, forestdn,
dnsadmins_sid):
# Set up additional partitions (DomainDnsZones, ForstDnsZones)
setup_dns_partitions(samdb, domainsid, domaindn, forestdn,
names.configdn, names.serverdn)
# Set up MicrosoftDNS containers
add_dns_container(samdb, domaindn, "DC=DomainDnsZones", domainsid,
dnsadmins_sid)
add_dns_container(samdb, forestdn, "DC=ForestDnsZones", domainsid,
dnsadmins_sid)
def fill_dns_data_partitions(samdb, domainsid, site, domaindn, forestdn,
dnsdomain, dnsforest, hostname, hostip, hostip6,
domainguid, ntdsguid, dnsadmins_sid, autofill=True):
"""Fill data in various AD partitions
:param samdb: LDB object connected to sam.ldb file
:param domainsid: Domain SID (as dom_sid object)
:param site: Site name to create hostnames in
:param domaindn: DN of the domain
:param forestdn: DN of the forest
:param dnsdomain: DNS name of the domain
:param dnsforest: DNS name of the forest
:param hostname: Host name of this DC
:param hostip: IPv4 addresses
:param hostip6: IPv6 addresses
:param domainguid: Domain GUID
:param ntdsguid: NTDS GUID
:param dnsadmins_sid: SID for DnsAdmins group
:param autofill: Create DNS records (using fixed template)
"""
##### Set up DC=DomainDnsZones,<DOMAINDN>
# Add rootserver records
add_rootservers(samdb, domaindn, "DC=DomainDnsZones")
# Add domain record
add_domain_record(samdb, domaindn, "DC=DomainDnsZones", dnsdomain,
domainsid, dnsadmins_sid)
# Add DNS records for a DC in domain
if autofill:
add_dc_domain_records(samdb, domaindn, "DC=DomainDnsZones", site,
dnsdomain, hostname, hostip, hostip6)
##### Set up DC=ForestDnsZones,<DOMAINDN>
# Add _msdcs record
add_msdcs_record(samdb, forestdn, "DC=ForestDnsZones", dnsforest)
# Add DNS records for a DC in forest
if autofill:
add_dc_msdcs_records(samdb, forestdn, "DC=ForestDnsZones", site,
dnsforest, hostname, hostip, hostip6,
domainguid, ntdsguid)
def setup_ad_dns(samdb, secretsdb, domainsid, names, paths, lp, logger,
dns_backend, os_level, site, dnspass=None, hostip=None, hostip6=None,
targetdir=None):
"""Provision DNS information (assuming GC role)
:param samdb: LDB object connected to sam.ldb file
:param secretsdb: LDB object connected to secrets.ldb file
:param domainsid: Domain SID (as dom_sid object)
:param names: Names shortcut
:param paths: Paths shortcut
:param lp: Loadparm object
:param logger: Logger object
:param dns_backend: Type of DNS backend
:param os_level: Functional level (treated as os level)
:param site: Site to create hostnames in
:param dnspass: Password for bind's DNS account
:param hostip: IPv4 address
:param hostip6: IPv6 address
:param targetdir: Target directory for creating DNS-related files for BIND9
"""
if not is_valid_dns_backend(dns_backend):
raise Exception("Invalid dns backend: %r" % dns_backend)
if not is_valid_os_level(os_level):
raise Exception("Invalid os level: %r" % os_level)
if dns_backend == "NONE":
logger.info("No DNS backend set, not configuring DNS")
return
# Add dns accounts (DnsAdmins, DnsUpdateProxy) in domain
logger.info("Adding DNS accounts")
add_dns_accounts(samdb, names.domaindn)
# If dns_backend is BIND9_FLATFILE
# Populate only CN=MicrosoftDNS,CN=System,<FORESTDN>
#
# If dns_backend is SAMBA_INTERNAL or BIND9_DLZ
# Populate DNS partitions
# If os_level < 2003 (DS_DOMAIN_FUNCTION_2000)
# All dns records are in CN=MicrosoftDNS,CN=System,<FORESTDN>
#
# If os_level >= 2003 (DS_DOMAIN_FUNCTION_2003, DS_DOMAIN_FUNCTION_2008,
# DS_DOMAIN_FUNCTION_2008_R2)
# Root server records are in CN=MicrosoftDNS,CN=System,<FORESTDN>
# Domain records are in CN=MicrosoftDNS,CN=System,<FORESTDN>
# Domain records are in CN=MicrosoftDNS,DC=DomainDnsZones,<DOMAINDN>
# Forest records are in CN=MicrosoftDNS,DC=ForestDnsZones,<FORESTDN>
domaindn = names.domaindn
forestdn = samdb.get_root_basedn().get_linearized()
dnsdomain = names.dnsdomain.lower()
dnsforest = dnsdomain
hostname = names.netbiosname.lower()
dnsadmins_sid = get_dnsadmins_sid(samdb, domaindn)
domainguid = get_domainguid(samdb, domaindn)
# Create CN=System
logger.info("Creating CN=MicrosoftDNS,CN=System,%s" % forestdn)
create_dns_legacy(samdb, domainsid, forestdn, dnsadmins_sid)
if os_level == DS_DOMAIN_FUNCTION_2000:
# Populating legacy dns
logger.info("Populating CN=MicrosoftDNS,CN=System,%s" % forestdn)
fill_dns_data_legacy(samdb, domainsid, forestdn, dnsdomain, site,
hostname, hostip, hostip6, dnsadmins_sid)
elif dns_backend in ("SAMBA_INTERNAL", "BIND9_DLZ") and \
os_level >= DS_DOMAIN_FUNCTION_2003:
# Create DNS partitions
logger.info("Creating DomainDnsZones and ForestDnsZones partitions")
create_dns_partitions(samdb, domainsid, names, domaindn, forestdn,
dnsadmins_sid)
# Populating dns partitions
logger.info("Populating DomainDnsZones and ForestDnsZones partitions")
fill_dns_data_partitions(samdb, domainsid, site, domaindn, forestdn,
dnsdomain, dnsforest, hostname, hostip, hostip6,
domainguid, names.ntdsguid, dnsadmins_sid)
if dns_backend.startswith("BIND9_"):
setup_bind9_dns(samdb, secretsdb, domainsid, names, paths, lp, logger,
dns_backend, os_level, site=site, dnspass=dnspass, hostip=hostip,
hostip6=hostip6, targetdir=targetdir)
def setup_bind9_dns(samdb, secretsdb, domainsid, names, paths, lp, logger,
dns_backend, os_level, site=None, dnspass=None, hostip=None,
hostip6=None, targetdir=None):
"""Provision DNS information (assuming BIND9 backend in DC role)
:param samdb: LDB object connected to sam.ldb file
:param secretsdb: LDB object connected to secrets.ldb file
:param domainsid: Domain SID (as dom_sid object)
:param names: Names shortcut
:param paths: Paths shortcut
:param lp: Loadparm object
:param logger: Logger object
:param dns_backend: Type of DNS backend
:param os_level: Functional level (treated as os level)
:param site: Site to create hostnames in
:param dnspass: Password for bind's DNS account
:param hostip: IPv4 address
:param hostip6: IPv6 address
:param targetdir: Target directory for creating DNS-related files for BIND9
"""
if (not is_valid_dns_backend(dns_backend) or
not dns_backend.startswith("BIND9_")):
raise Exception("Invalid dns backend: %r" % dns_backend)
if not is_valid_os_level(os_level):
raise Exception("Invalid os level: %r" % os_level)
domaindn = names.domaindn
domainguid = get_domainguid(samdb, domaindn)
secretsdb_setup_dns(secretsdb, names,
paths.private_dir, realm=names.realm,
dnsdomain=names.dnsdomain,
dns_keytab_path=paths.dns_keytab, dnspass=dnspass)
create_dns_dir(logger, paths)
if dns_backend == "BIND9_FLATFILE":
create_zone_file(lp, logger, paths, targetdir, site=site,
dnsdomain=names.dnsdomain, hostip=hostip,
hostip6=hostip6, hostname=names.hostname,
realm=names.realm, domainguid=domainguid,
ntdsguid=names.ntdsguid)
if dns_backend == "BIND9_DLZ" and os_level >= DS_DOMAIN_FUNCTION_2003:
create_samdb_copy(samdb, logger, paths, names, domainsid, domainguid)
create_named_conf(paths, realm=names.realm,
dnsdomain=names.dnsdomain, dns_backend=dns_backend)
create_named_txt(paths.namedtxt,
realm=names.realm, dnsdomain=names.dnsdomain,
dnsname = "%s.%s" % (names.hostname, names.dnsdomain),
private_dir=paths.private_dir,
keytab_name=paths.dns_keytab)
logger.info("See %s for an example configuration include file for BIND",
paths.namedconf)
logger.info("and %s for further documentation required for secure DNS "
"updates", paths.namedtxt)