3 # Unix SMB/CIFS implementation.
4 # Copyright (C) Amitay Isaacs <amitay@gmail.com> 2012
6 # Upgrade DNS provision from BIND9_FLATFILE to BIND9_DLZ or SAMBA_INTERNAL
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
26 from base64 import b64encode
29 sys.path.insert(0, "bin/python")
33 from samba import param
34 from samba.auth import system_session
35 from samba.ndr import (
38 import samba.getopt as options
39 from samba.upgradehelpers import (
42 from samba.dsdb import DS_DOMAIN_FUNCTION_2003
43 from samba.provision import (
44 find_provision_key_parameters,
47 from samba.provision.common import (
50 from samba.provision.sambadns import (
60 create_dns_partitions,
61 fill_dns_data_partitions,
67 from samba.dcerpc import security
69 samba.ensure_external_module("dns", "dnspython")
70 import dns.zone, dns.rdatatype
72 __docformat__ = 'restructuredText'
76 """Find system group id for bind9
78 for name in ["bind", "named"]:
80 return grp.getgrnam(name)[2]
86 def fix_names(pnames):
87 """Convert elements to strings from MessageElement
90 names.rootdn = pnames.rootdn[0]
91 names.domaindn = pnames.domaindn[0]
92 names.configdn = pnames.configdn[0]
93 names.schemadn = pnames.schemadn[0]
94 names.wheel_gid = pnames.wheel_gid[0]
95 names.serverdn = str(pnames.serverdn)
99 def convert_dns_rdata(rdata, serial=1):
100 """Convert resource records in dnsRecord format
102 if rdata.rdtype == dns.rdatatype.A:
103 rec = ARecord(rdata.address, serial=serial)
104 elif rdata.rdtype == dns.rdatatype.AAAA:
105 rec = AAAARecord(rdata.address, serial=serial)
106 elif rdata.rdtype == dns.rdatatype.CNAME:
107 rec = CNameRecord(rdata.target.to_text(), serial=serial)
108 elif rdata.rdtype == dns.rdatatype.NS:
109 rec = NSRecord(rdata.target.to_text(), serial=serial)
110 elif rdata.rdtype == dns.rdatatype.SRV:
111 rec = SRVRecord(rdata.target.to_text(), int(rdata.port),
112 priority=int(rdata.priority), weight=int(rdata.weight),
114 elif rdata.rdtype == dns.rdatatype.TXT:
115 slist = shlex.split(rdata.to_text())
116 rec = TXTRecord(slist, serial=serial)
117 elif rdata.rdtype == dns.rdatatype.SOA:
118 rec = SOARecord(rdata.mname.to_text(), rdata.rname.to_text(),
119 serial=int(rdata.serial),
120 refresh=int(rdata.refresh), retry=int(rdata.retry),
121 expire=int(rdata.expire), minimum=int(rdata.minimum))
127 def import_zone_data(samdb, logger, zone, serial, domaindn, forestdn,
128 dnsdomain, dnsforest):
129 """Insert zone data in DNS partitions
131 labels = dnsdomain.split('.')
133 domain_root = dns.name.Name(labels)
134 domain_prefix = "DC=%s,CN=MicrosoftDNS,DC=DomainDnsZones,%s" % (dnsdomain,
137 tmp = "_msdcs.%s" % dnsforest
138 labels = tmp.split('.')
140 forest_root = dns.name.Name(labels)
141 dnsmsdcs = "_msdcs.%s" % dnsforest
142 forest_prefix = "DC=%s,CN=MicrosoftDNS,DC=ForestDnsZones,%s" % (dnsmsdcs,
146 at_record = zone.get_node(domain_root)
147 zone.delete_node(domain_root)
150 rdset = at_record.get_rdataset(dns.rdataclass.IN, dns.rdatatype.SOA)
151 soa_rec = ndr_pack(convert_dns_rdata(rdset[0]))
152 at_record.delete_rdataset(dns.rdataclass.IN, dns.rdatatype.SOA)
155 rdset = at_record.get_rdataset(dns.rdataclass.IN, dns.rdatatype.NS)
156 ns_rec = ndr_pack(convert_dns_rdata(rdset[0]))
157 at_record.delete_rdataset(dns.rdataclass.IN, dns.rdatatype.NS)
161 for rdset in at_record:
163 rec = convert_dns_rdata(r)
164 ip_recs.append(ndr_pack(rec))
166 # Add @ record for domain
167 dns_rec = [soa_rec, ns_rec] + ip_recs
168 msg = ldb.Message(ldb.Dn(samdb, 'DC=@,%s' % domain_prefix))
169 msg["objectClass"] = ["top", "dnsNode"]
170 msg["dnsRecord"] = ldb.MessageElement(dns_rec, ldb.FLAG_MOD_ADD,
175 logger.error("Failed to add @ record for domain")
177 logger.debug("Added @ record for domain")
179 # Add @ record for forest
180 dns_rec = [soa_rec, ns_rec]
181 msg = ldb.Message(ldb.Dn(samdb, 'DC=@,%s' % forest_prefix))
182 msg["objectClass"] = ["top", "dnsNode"]
183 msg["dnsRecord"] = ldb.MessageElement(dns_rec, ldb.FLAG_MOD_ADD,
188 logger.error("Failed to add @ record for forest")
190 logger.debug("Added @ record for forest")
192 # Add remaining records in domain and forest
193 for node in zone.nodes:
194 name = node.relativize(forest_root).to_text()
195 if name == node.to_text():
196 name = node.relativize(domain_root).to_text()
197 dn = "DC=%s,%s" % (name, domain_prefix)
198 fqdn = "%s.%s" % (name, dnsdomain)
200 dn = "DC=%s,%s" % (name, forest_prefix)
201 fqdn = "%s.%s" % (name, dnsmsdcs)
204 for rdataset in zone.nodes[node]:
205 for rdata in rdataset:
206 rec = convert_dns_rdata(rdata, serial)
208 logger.warn("Unsupported record type (%s) for %s, ignoring" %
209 dns.rdatatype.to_text(rdata.rdatatype), name)
211 dns_rec.append(ndr_pack(rec))
213 msg = ldb.Message(ldb.Dn(samdb, dn))
214 msg["objectClass"] = ["top", "dnsNode"]
215 msg["dnsRecord"] = ldb.MessageElement(dns_rec, ldb.FLAG_MOD_ADD,
220 logger.error("Failed to add DNS record %s" % (fqdn))
222 logger.debug("Added DNS record %s" % (fqdn))
225 # dnsprovision creates application partitions for AD based DNS mainly if the existing
226 # provision was created using earlier snapshots of samba4 which did not have support
229 if __name__ == '__main__':
231 # Setup command line parser
232 parser = optparse.OptionParser("upgradedns [options]")
233 sambaopts = options.SambaOptions(parser)
234 credopts = options.CredentialsOptions(parser)
236 parser.add_option_group(options.VersionOptions(parser))
237 parser.add_option_group(sambaopts)
238 parser.add_option_group(credopts)
240 parser.add_option("--dns-backend", type="choice", metavar="<BIND9_DLZ|SAMBA_INTERNAL>",
241 choices=["SAMBA_INTERNAL", "BIND9_DLZ"], default="BIND9_DLZ",
242 help="The DNS server backend, default BIND9_DLZ")
243 parser.add_option("--migrate", type="choice", metavar="<yes|no>",
244 choices=["yes","no"], default="yes",
245 help="Migrate existing zone data, default yes")
246 parser.add_option("--verbose", help="Be verbose", action="store_true")
248 opts = parser.parse_args()[0]
250 if opts.dns_backend is None:
251 opts.dns_backend = 'DLZ_BIND9'
259 logger = logging.getLogger("upgradedns")
260 logger.addHandler(logging.StreamHandler(sys.stdout))
261 logger.setLevel(logging.INFO)
263 logger.setLevel(logging.DEBUG)
265 lp = sambaopts.get_loadparm()
266 lp.load(lp.configfile)
267 creds = credopts.get_credentials(lp)
269 logger.info("Reading domain information")
270 paths = get_paths(param, smbconf=lp.configfile)
271 paths.bind_gid = find_bind_gid()
272 ldbs = get_ldbs(paths, creds, system_session(), lp)
273 pnames = find_provision_key_parameters(ldbs.sam, ldbs.secrets, ldbs.idmap,
274 paths, lp.configfile, lp)
275 names = fix_names(pnames)
277 if names.domainlevel < DS_DOMAIN_FUNCTION_2003:
278 logger.error("Cannot create AD based DNS for OS level < 2003")
281 logger.info("Looking up IPv4 addresses")
282 hostip = interface_ips_v4(lp)
284 hostip.remove('127.0.0.1')
288 logger.error("No IPv4 addresses found")
292 logger.debug("IPv4 addresses: %s" % hostip)
294 logger.info("Looking up IPv6 addresses")
295 hostip6 = interface_ips_v6(lp, linklocal=False)
300 logger.debug("IPv6 addresses: %s" % hostip6)
302 domaindn = names.domaindn
303 forestdn = names.rootdn
305 dnsdomain = names.dnsdomain.lower()
306 dnsforest = dnsdomain
308 site = names.sitename
309 hostname = names.hostname
310 dnsname = '%s.%s' % (hostname, dnsdomain)
312 domainsid = names.domainsid
313 domainguid = names.domainguid
314 ntdsguid = names.ntdsguid
316 # Check for DNS accounts and create them if required
318 msg = ldbs.sam.search(base=domaindn, scope=ldb.SCOPE_DEFAULT,
319 expression='(sAMAccountName=DnsAdmins)',
321 dnsadmins_sid = ndr_unpack(security.dom_sid, msg[0]['objectSid'][0])
323 logger.info("Adding DNS accounts")
324 add_dns_accounts(ldbs.sam, domaindn)
325 dnsadmins_sid = get_dnsadmins_sid(ldbs.sam, domaindn)
327 logger.info("DNS accounts already exist")
329 # Import dns records from zone file
330 if os.path.exists(paths.dns):
331 logger.info("Reading records from zone file %s" % paths.dns)
333 zone = dns.zone.from_file(paths.dns, relativize=False)
334 rrset = zone.get_rdataset("%s." % dnsdomain, dns.rdatatype.SOA)
335 serial = int(rrset[0].serial)
337 logger.warn("Error parsing DNS data from '%s' (%s)" % (paths.dns, str(e)))
338 logger.warn("DNS records will be automatically created")
341 logger.info("No zone file %s" % paths.dns)
342 logger.warn("DNS records will be automatically created")
345 # Create DNS partitions if missing and fill DNS information
347 expression = '(|(dnsRoot=DomainDnsZones.%s)(dnsRoot=ForestDnsZones.%s))' % \
348 (dnsdomain, dnsforest)
349 msg = ldbs.sam.search(base=names.configdn, scope=ldb.SCOPE_DEFAULT,
350 expression=expression, attrs=['nCName'])
351 ncname = msg[0]['nCName'][0]
353 logger.info("Creating DNS partitions")
354 create_dns_partitions(ldbs.sam, domainsid, names, domaindn, forestdn,
357 logger.info("Populating DNS partitions")
358 fill_dns_data_partitions(ldbs.sam, domainsid, site, domaindn, forestdn,
359 dnsdomain, dnsforest, hostname, hostip, hostip6,
360 domainguid, ntdsguid, dnsadmins_sid,
364 logger.info("Importing records from zone file")
365 import_zone_data(ldbs.sam, logger, zone, serial, domaindn, forestdn,
366 dnsdomain, dnsforest)
368 logger.info("DNS partitions already exist")
370 # Mark that we are hosting DNS partitions
372 dns_nclist = [ 'DC=DomainDnsZones,%s' % domaindn,
373 'DC=ForestDnsZones,%s' % forestdn ]
375 msgs = ldbs.sam.search(base=names.serverdn, scope=ldb.SCOPE_DEFAULT,
376 expression='(objectclass=nTDSDSa)',
377 attrs=['hasPartialReplicaNCs',
378 'msDS-hasMasterNCs'])
382 ncs = msg.get("msDS-hasMasterNCs")
385 master_nclist.append(nc)
388 ncs = msg.get("hasPartialReplicaNCs")
391 partial_nclist.append(nc)
393 modified_master = False
394 modified_partial = False
395 for nc in dns_nclist:
396 if nc not in master_nclist:
397 master_nclist.append(nc)
398 modified_master = True
399 if nc in partial_nclist:
400 partial_nclist.remove(nc)
401 modified_partial = True
403 if modified_master or modified_partial:
404 logger.debug("Updating msDS-hasMasterNCs and hasPartialReplicaNCs attributes")
408 m["msDS-hasMasterNCs"] = ldb.MessageElement(master_nclist,
409 ldb.FLAG_MOD_REPLACE,
413 m["hasPartialReplicaNCs"] = ldb.MessageElement(partial_nclist,
414 ldb.FLAG_MOD_REPLACE,
415 "hasPartialReplicaNCs")
417 m["hasPartialReplicaNCs"] = ldb.MessageElement(ncs,
419 "hasPartialReplicaNCs")
424 # Special stuff for DLZ backend
425 if opts.dns_backend == "BIND9_DLZ":
426 # Check if dns-HOSTNAME account exists and create it if required
428 dn = 'samAccountName=dns-%s,CN=Principals' % hostname
429 msg = ldbs.secrets.search(expression='(dn=%s)' % dn, attrs=['secret'])
430 dnssecret = msg[0]['secret'][0]
432 logger.info("Adding dns-%s account" % hostname)
435 msg = ldbs.sam.search(base=domaindn, scope=ldb.SCOPE_DEFAULT,
436 expression='(sAMAccountName=dns-%s)' % (hostname),
437 attrs=['clearTextPassword'])
443 dnspass = samba.generate_random_password(128, 255)
444 setup_add_ldif(ldbs.sam, setup_path("provision_dns_add_samba.ldif"), {
445 "DNSDOMAIN": dnsdomain,
446 "DOMAINDN": domaindn,
447 "DNSPASS_B64": b64encode(dnspass.encode('utf-16-le')),
448 "HOSTNAME" : hostname,
449 "DNSNAME" : dnsname }
452 secretsdb_setup_dns(ldbs.secrets, names,
453 paths.private_dir, realm=names.realm,
454 dnsdomain=names.dnsdomain,
455 dns_keytab_path=paths.dns_keytab, dnspass=dnspass)
457 logger.info("dns-%s account already exists" % hostname)
459 # This forces a re-creation of dns directory and all the files within
460 # It's an overkill, but it's easier to re-create a samdb copy, rather
461 # than trying to fix a broken copy.
462 create_dns_dir(logger, paths)
464 # Setup a copy of SAM for BIND9
465 create_samdb_copy(ldbs.sam, logger, paths, names, domainsid,
468 create_named_conf(paths, names.realm, dnsdomain, opts.dns_backend)
470 create_named_txt(paths.namedtxt, names.realm, dnsdomain, dnsname,
471 paths.private_dir, paths.dns_keytab)
472 logger.info("See %s for an example configuration include file for BIND", paths.namedconf)
473 logger.info("and %s for further documentation required for secure DNS "
474 "updates", paths.namedtxt)
476 logger.info("Finished upgrading DNS")