source4/scripting/python/samba/join.py

   1 #!/usr/bin/env python
   2 #
   3 # python join code
   4 # Copyright Andrew Tridgell 2010
   5 # Copyright Andrew Bartlett 2010
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 import samba.getopt as options
  22 from samba.auth import system_session
  23 from samba.samdb import SamDB
  24 from samba import gensec, Ldb
  25 import ldb, samba, sys
  26 from samba.ndr import ndr_pack, ndr_unpack, ndr_print
  27 from samba.dcerpc import security
  28 from samba.dcerpc import drsuapi, misc, netlogon
  29 from samba.credentials import Credentials, DONT_USE_KERBEROS
  30 from samba.provision import secretsdb_self_join, provision, FILL_DRS, find_setup_dir
  31 from samba.net import Net
  32 import logging
  33
  34 # this makes debugging easier
  35 samba.talloc_enable_null_tracking()
  36
  37 class join_ctx:
  38     '''hold join context variables'''
  39     pass
  40
  41 def join_rodc(server=None, creds=None, lp=None, site=None, netbios_name=None,
  42               targetdir=None):
  43     """join as a RODC"""
  44
  45     if server is None:
  46         raise Exception("You must supply a server for a RODC join")
  47
  48     def del_noerror(samdb, dn):
  49         try:
  50             samdb.delete(dn)
  51             print "Deleted %s" % dn
  52         except:
  53             pass
  54
  55     def cleanup_old_join(ctx):
  56         '''remove any DNs from a previous join'''
  57         try:
  58             # find the krbtgt link
  59             res = ctx.samdb.search(base=ctx.acct_dn, scope=ldb.SCOPE_BASE, attrs=["msDS-krbTgtLink"])
  60             del_noerror(ctx.samdb, ctx.acct_dn)
  61             del_noerror(ctx.samdb, ctx.connection_dn)
  62             del_noerror(ctx.samdb, ctx.krbtgt_dn)
  63             del_noerror(ctx.samdb, ctx.ntds_dn)
  64             del_noerror(ctx.samdb, ctx.server_dn)
  65             del_noerror(ctx.samdb, ctx.topology_dn)
  66             ctx.new_krbtgt_dn = res[0]["msDS-Krbtgtlink"][0]
  67             del_noerror(ctx.samdb, ctx.new_krbtgt_dn)
  68         except:
  69             pass
  70
  71     def get_dsServiceName(samdb):
  72         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["dsServiceName"])
  73         return res[0]["dsServiceName"][0]
  74
  75     def get_dnsHostName(samdb):
  76         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["dnsHostName"])
  77         return res[0]["dnsHostName"][0]
  78
  79     def get_mysid(samdb):
  80         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["tokenGroups"])
  81         binsid = res[0]["tokenGroups"][0]
  82         return samdb.schema_format_value("objectSID", binsid)
  83
  84     def get_domain_name(samdb):
  85         # this should be done via CLDAP
  86         res = samdb.search(base=samdb.get_default_basedn(), scope=ldb.SCOPE_BASE, attrs=["name"])
  87         return res[0]["name"][0]
  88
  89     def do_DsBind(drs):
  90         '''make a DsBind call, returning the binding handle'''
  91         bind_info = drsuapi.DsBindInfoCtr()
  92         bind_info.length = 28
  93         bind_info.info = drsuapi.DsBindInfo28()
  94         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_BASE;
  95         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ASYNC_REPLICATION;
  96         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_REMOVEAPI;
  97         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_MOVEREQ_V2;
  98         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHG_COMPRESS;
  99         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V1;
 100         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_RESTORE_USN_OPTIMIZATION;
 101         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_KCC_EXECUTE;
 102         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRY_V2;
 103         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_LINKED_VALUE_REPLICATION;
 104         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V2;
 105         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_INSTANCE_TYPE_NOT_REQ_ON_MOD;
 106         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_CRYPTO_BIND;
 107         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_REPL_INFO;
 108         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_STRONG_ENCRYPTION;
 109         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V01;
 110         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_TRANSITIVE_MEMBERSHIP;
 111         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADD_SID_HISTORY;
 112         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_POST_BETA3;
 113         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_MEMBERSHIPS2;
 114         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V6;
 115         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_NONDOMAIN_NCS;
 116         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V8;
 117         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V5;
 118         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V6;
 119         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRYREPLY_V3;
 120         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V7;
 121         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_VERIFY_OBJECT;
 122         (info, handle) = drs.DsBind(misc.GUID(drsuapi.DRSUAPI_DS_BIND_GUID), bind_info)
 123         return handle
 124
 125     def get_rodc_partial_attribute_set(ctx):
 126         '''get a list of attributes for RODC replication'''
 127         partial_attribute_set = drsuapi.DsPartialAttributeSet()
 128         partial_attribute_set.version = 1
 129
 130         ctx.attids = []
 131
 132         # the exact list of attids we send is quite critical. Note that
 133         # we do ask for the secret attributes, but set set SPECIAL_SECRET_PROCESSING
 134         # to zero them out
 135         res = ctx.local_samdb.search(base=ctx.schema_dn, scope=ldb.SCOPE_SUBTREE,
 136                                      expression="objectClass=attributeSchema",
 137                                      attrs=["lDAPDisplayName", "systemFlags",
 138                                             "searchFlags"])
 139
 140         for r in res:
 141             ldap_display_name = r["lDAPDisplayName"][0]
 142             if "systemFlags" in r:
 143                 system_flags      = r["systemFlags"][0]
 144                 if (int(system_flags) & (samba.dsdb.DS_FLAG_ATTR_NOT_REPLICATED |
 145                                          samba.dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED)):
 146                     continue
 147             search_flags = r["searchFlags"][0]
 148             if (int(search_flags) & samba.dsdb.SEARCH_FLAG_RODC_ATTRIBUTE):
 149                 continue
 150             attid = ctx.local_samdb.get_attid_from_lDAPDisplayName(ldap_display_name)
 151             ctx.attids.append(int(attid))
 152
 153         # the attids do need to be sorted, or windows doesn't return
 154         # all the attributes we need
 155         ctx.attids.sort()
 156         partial_attribute_set.attids         = ctx.attids
 157         partial_attribute_set.num_attids = len(ctx.attids)
 158         return partial_attribute_set
 159
 160
 161     def replicate_partition(ctx, dn, schema=False, exop=drsuapi.DRSUAPI_EXOP_NONE):
 162         '''replicate a partition'''
 163
 164         # setup for a GetNCChanges call
 165         req8 = drsuapi.DsGetNCChangesRequest8()
 166
 167         req8.destination_dsa_guid           = ctx.ntds_guid
 168         req8.source_dsa_invocation_id       = misc.GUID(ctx.samdb.get_invocation_id())
 169         req8.naming_context                 = drsuapi.DsReplicaObjectIdentifier()
 170         req8.naming_context.dn              = dn.decode("utf-8")
 171         req8.highwatermark                  = drsuapi.DsReplicaHighWaterMark()
 172         req8.highwatermark.tmp_highest_usn  = 0
 173         req8.highwatermark.reserved_usn     = 0
 174         req8.highwatermark.highest_usn      = 0
 175         req8.uptodateness_vector            = None
 176         if exop == drsuapi.DRSUAPI_EXOP_REPL_SECRET:
 177             req8.replica_flags              = 0
 178         else:
 179             req8.replica_flags              =  (drsuapi.DRSUAPI_DRS_INIT_SYNC |
 180                                                 drsuapi.DRSUAPI_DRS_PER_SYNC |
 181                                                 drsuapi.DRSUAPI_DRS_GET_ANC |
 182                                                 drsuapi.DRSUAPI_DRS_NEVER_SYNCED |
 183                                                 drsuapi.DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING)
 184         req8.max_object_count                = 402
 185         req8.max_ndr_size                    = 402116
 186         req8.extended_op                     = exop
 187         req8.fsmo_info                       = 0
 188         req8.partial_attribute_set           = None
 189         req8.partial_attribute_set_ex        = None
 190         req8.mapping_ctr.num_mappings        = 0
 191         req8.mapping_ctr.mappings            = None
 192
 193         if not schema:
 194             req8.partial_attribute_set = get_rodc_partial_attribute_set(ctx)
 195
 196         while True:
 197             (level, ctr) = ctx.drs.DsGetNCChanges(ctx.drs_handle, 8, req8)
 198             ctx.net.replicate_chunk(ctx.replication_state, level, ctr, schema=schema)
 199             if ctr.more_data == 0:
 200                 break
 201             req8.highwatermark.tmp_highest_usn = ctr.new_highwatermark.tmp_highest_usn
 202
 203
 204     def join_add_objects(ctx):
 205         '''add the various objects needed for the join'''
 206         print "Adding %s" % ctx.acct_dn
 207         rec = {
 208             "dn" : ctx.acct_dn,
 209             "objectClass": "computer",
 210             "displayname": ctx.samname,
 211             "samaccountname" : ctx.samname,
 212             "useraccountcontrol" : str(samba.dsdb.UF_WORKSTATION_TRUST_ACCOUNT |
 213                                        samba.dsdb.UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION |
 214                                        samba.dsdb.UF_PARTIAL_SECRETS_ACCOUNT),
 215             "managedby" : ctx.admin_dn,
 216             "dnshostname" : ctx.dnshostname,
 217             "msDS-NeverRevealGroup" : ctx.never_reveal_sid,
 218             "msDS-RevealOnDemandGroup" : ctx.reveal_sid}
 219         ctx.samdb.add(rec)
 220
 221         print "Adding %s" % ctx.krbtgt_dn
 222         rec = {
 223             "dn" : ctx.krbtgt_dn,
 224             "objectclass" : "user",
 225             "useraccountcontrol" : str(samba.dsdb.UF_NORMAL_ACCOUNT |
 226                                        samba.dsdb.UF_ACCOUNTDISABLE),
 227             "showinadvancedviewonly" : "TRUE",
 228             "description" : "tricky account"}
 229         ctx.samdb.add(rec, ["rodc_join:1:1"])
 230
 231         # now we need to search for the samAccountName attribute on the krbtgt DN,
 232         # as this will have been magically set to the krbtgt number
 233         res = ctx.samdb.search(base=ctx.krbtgt_dn, scope=ldb.SCOPE_BASE, attrs=["samAccountName"])
 234         ctx.krbtgt_name = res[0]["samAccountName"][0]
 235
 236         print "Got krbtgt_name=%s" % ctx.krbtgt_name
 237
 238         m = ldb.Message()
 239         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 240         m["msDS-krbTgtLink"] = ldb.MessageElement(ctx.krbtgt_dn,
 241                                                   ldb.FLAG_MOD_REPLACE, "msDS-krbTgtLink")
 242         ctx.samdb.modify(m)
 243
 244         ctx.new_krbtgt_dn = "CN=%s,CN=Users,%s" % (ctx.krbtgt_name, ctx.base_dn)
 245         print "Renaming %s to %s" % (ctx.krbtgt_dn, ctx.new_krbtgt_dn)
 246         ctx.samdb.rename(ctx.krbtgt_dn, ctx.new_krbtgt_dn)
 247
 248         print "Adding %s" % ctx.server_dn
 249         rec = {
 250             "dn": ctx.server_dn,
 251             "objectclass" : "server",
 252             "systemFlags" : str(samba.dsdb.SYSTEM_FLAG_CONFIG_ALLOW_RENAME |
 253                                 samba.dsdb.SYSTEM_FLAG_CONFIG_ALLOW_LIMITED_MOVE |
 254                                 samba.dsdb.SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE),
 255             "serverReference" : ctx.acct_dn,
 256             "dnsHostName" : ctx.dnshostname}
 257         ctx.samdb.add(rec)
 258
 259         print "Adding %s" % ctx.ntds_dn
 260         rec = {
 261             "dn" : ctx.ntds_dn,
 262             "objectclass" : "nTDSDSA",
 263             "objectCategory" : "CN=NTDS-DSA-RO,%s" % ctx.schema_dn,
 264             "systemFlags" : str(samba.dsdb.SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE),
 265             "dMDLocation" : ctx.schema_dn,
 266             "options" : "37",
 267             "msDS-Behavior-Version" : "4",
 268             "msDS-HasDomainNCs" : ctx.base_dn,
 269             "msDS-HasFullReplicaNCs" : [ ctx.base_dn, ctx.config_dn, ctx.schema_dn ]}
 270         ctx.samdb.add(rec, ["rodc_join:1:1"])
 271
 272         # find the GUID of our NTDS DN
 273         res = ctx.samdb.search(base=ctx.ntds_dn, scope=ldb.SCOPE_BASE, attrs=["objectGUID"])
 274         ctx.ntds_guid = misc.GUID(ctx.samdb.schema_format_value("objectGUID", res[0]["objectGUID"][0]))
 275
 276         print "Adding %s" % ctx.connection_dn
 277         rec = {
 278             "dn" : ctx.connection_dn,
 279             "objectclass" : "nTDSConnection",
 280             "enabledconnection" : "TRUE",
 281             "options" : "65",
 282             "fromServer" : ctx.dc_ntds_dn}
 283         ctx.samdb.add(rec)
 284
 285         print "Adding %s" % ctx.topology_dn
 286         rec = {
 287             "dn" : ctx.topology_dn,
 288             "objectclass" : "msDFSR-Member",
 289             "msDFSR-ComputerReference" : ctx.acct_dn,
 290             "serverReference" : ctx.ntds_dn}
 291         ctx.samdb.add(rec)
 292
 293         print "Adding HOST SPNs to %s" % ctx.acct_dn
 294         m = ldb.Message()
 295         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 296         SPNs = [ "HOST/%s" % ctx.myname,
 297                  "HOST/%s" % ctx.dnshostname ]
 298         m["servicePrincipalName"] = ldb.MessageElement(SPNs,
 299                                                        ldb.FLAG_MOD_ADD,
 300                                                        "servicePrincipalName")
 301         ctx.samdb.modify(m)
 302
 303         print "Adding RestrictedKrbHost SPNs to %s" % ctx.acct_dn
 304         m = ldb.Message()
 305         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 306         SPNs = [ "RestrictedKrbHost/%s" % ctx.myname,
 307                  "RestrictedKrbHost/%s" % ctx.dnshostname ]
 308         m["servicePrincipalName"] = ldb.MessageElement(SPNs,
 309                                                        ldb.FLAG_MOD_ADD,
 310                                                        "servicePrincipalName")
 311         ctx.samdb.modify(m)
 312
 313         print "Setting account password for %s" % ctx.samname
 314         ctx.samdb.setpassword("(&(objectClass=user)(sAMAccountName=%s))" % ctx.samname,
 315                               ctx.acct_pass,
 316                               force_change_at_next_login=False,
 317                               username=ctx.samname)
 318
 319
 320     def join_drs_connect(ctx):
 321         '''connect to DRSUAPI'''
 322         print "Doing DsBind as %s" % ctx.samname
 323         ctx.acct_creds = Credentials()
 324         ctx.acct_creds.guess(ctx.lp)
 325         ctx.acct_creds.set_kerberos_state(DONT_USE_KERBEROS)
 326         ctx.acct_creds.set_username(ctx.samname)
 327         ctx.acct_creds.set_password(ctx.acct_pass)
 328
 329         ctx.drs = drsuapi.drsuapi("ncacn_ip_tcp:%s[seal,print]" % ctx.server, ctx.lp, ctx.acct_creds)
 330         ctx.drs_handle = do_DsBind(ctx.drs)
 331
 332
 333     def join_provision(ctx):
 334         '''provision the local SAM'''
 335
 336         print "Calling bare provision"
 337
 338         setup_dir = find_setup_dir()
 339         logger = logging.getLogger("provision")
 340         logger.addHandler(logging.StreamHandler(sys.stdout))
 341         smbconf = lp.configfile
 342
 343         presult = provision(setup_dir, logger, system_session(), None,
 344                             smbconf=smbconf, targetdir=targetdir, samdb_fill=FILL_DRS,
 345                             realm=ctx.realm, rootdn=ctx.root_dn, domaindn=ctx.base_dn,
 346                             schemadn=ctx.schema_dn,
 347                             configdn=ctx.config_dn,
 348                             serverdn=ctx.server_dn, domain=ctx.domain_name,
 349                             hostname=ctx.myname, hostip="127.0.0.1", domainsid=ctx.domsid,
 350                             machinepass=ctx.acct_pass, serverrole="domain controller",
 351                             sitename=ctx.site)
 352         print "Provision OK for domain DN %s" % presult.domaindn
 353         ctx.local_samdb = presult.samdb
 354         ctx.lp          = presult.lp
 355         ctx.paths       = presult.paths
 356
 357
 358     def join_replicate(ctx):
 359         '''replicate the SAM'''
 360
 361         print "Starting replication"
 362         ctx.local_samdb.transaction_start()
 363
 364         ctx.replication_state = ctx.net.replicate_init(ctx.local_samdb, ctx.lp, ctx.drs)
 365
 366         replicate_partition(ctx, ctx.schema_dn, schema=True)
 367         replicate_partition(ctx, ctx.config_dn)
 368         replicate_partition(ctx, ctx.base_dn)
 369         replicate_partition(ctx, ctx.acct_dn, exop=drsuapi.DRSUAPI_EXOP_REPL_SECRET)
 370         replicate_partition(ctx, ctx.new_krbtgt_dn, exop=drsuapi.DRSUAPI_EXOP_REPL_SECRET)
 371
 372         print "Committing SAM database"
 373         ctx.local_samdb.transaction_commit()
 374
 375
 376     def join_finalise(ctx):
 377         '''finalise the join, mark us synchronised and setup secrets db'''
 378
 379         print "Setting isSynchronized"
 380         m = ldb.Message()
 381         m.dn = ldb.Dn(ctx.samdb, '@ROOTDSE')
 382         m["isSynchronized"] = ldb.MessageElement("TRUE", ldb.FLAG_MOD_REPLACE, "isSynchronized")
 383         ctx.samdb.modify(m)
 384
 385         secrets_ldb = Ldb(ctx.paths.secrets, session_info=system_session(), lp=ctx.lp)
 386
 387         print "Setting up secrets database"
 388         secretsdb_self_join(secrets_ldb, domain=ctx.domain_name,
 389                             realm=ctx.realm,
 390                             dnsdomain=ctx.dnsdomain,
 391                             netbiosname=ctx.myname,
 392                             domainsid=security.dom_sid(ctx.domsid),
 393                             machinepass=ctx.acct_pass,
 394                             secure_channel_type=misc.SEC_CHAN_RODC)
 395
 396
 397
 398     # main join code
 399     ctx = join_ctx()
 400     ctx.creds = creds
 401     ctx.lp = lp
 402     ctx.site = site
 403     ctx.netbios_name = netbios_name
 404     ctx.targetdir = targetdir
 405     ctx.server = server
 406
 407     ctx.creds.set_gensec_features(creds.get_gensec_features() | gensec.FEATURE_SEAL)
 408
 409     ctx.samdb = SamDB(url="ldap://%s" % ctx.server,
 410                       session_info=system_session(),
 411                       credentials=ctx.creds, lp=ctx.lp)
 412     ctx.net = Net(creds=ctx.creds, lp=ctx.lp)
 413
 414     ctx.myname = netbios_name
 415     ctx.samname = "%s$" % ctx.myname
 416     ctx.base_dn = str(ctx.samdb.get_default_basedn())
 417     ctx.root_dn = str(ctx.samdb.get_root_basedn())
 418     ctx.schema_dn = str(ctx.samdb.get_schema_basedn())
 419     ctx.config_dn = str(ctx.samdb.get_config_basedn())
 420     ctx.domsid = ctx.samdb.get_domain_sid()
 421     ctx.domain_name = get_domain_name(ctx.samdb)
 422
 423     ctx.dc_ntds_dn = get_dsServiceName(ctx.samdb)
 424     ctx.dc_dnsHostName = get_dnsHostName(ctx.samdb)
 425     ctx.acct_pass = samba.generate_random_password(12, 32)
 426     ctx.mysid = get_mysid(ctx.samdb)
 427
 428     # work out the DNs of all the objects we will be adding
 429     ctx.admin_dn = "<SID=%s>" % ctx.mysid
 430     ctx.krbtgt_dn = "CN=krbtgt_%s,CN=Users,%s" % (ctx.myname, ctx.base_dn)
 431     ctx.server_dn = "CN=%s,CN=Servers,CN=%s,CN=Sites,%s" % (ctx.myname, ctx.site, ctx.config_dn)
 432     ctx.ntds_dn = "CN=NTDS Settings,%s" % ctx.server_dn
 433     ctx.connection_dn = "CN=RODC Connection (FRS),%s" % ctx.ntds_dn
 434     ctx.topology_dn = "CN=%s,CN=Topology,CN=Domain System Volume,CN=DFSR-GlobalSettings,CN=System,%s" % (ctx.myname, ctx.base_dn)
 435
 436     # setup some defaults for accounts that should be replicated to this RODC
 437     ctx.never_reveal_sid = [ "<SID=%s-%s>" % (ctx.domsid, security.DOMAIN_RID_RODC_DENY),
 438                              "<SID=%s>" % security.SID_BUILTIN_ADMINISTRATORS,
 439                              "<SID=%s>" % security.SID_BUILTIN_SERVER_OPERATORS,
 440                              "<SID=%s>" % security.SID_BUILTIN_BACKUP_OPERATORS,
 441                              "<SID=%s>" % security.SID_BUILTIN_ACCOUNT_OPERATORS ]
 442     ctx.reveal_sid = "<SID=%s-%s>" % (ctx.domsid, security.DOMAIN_RID_RODC_ALLOW)
 443
 444     ctx.dnsdomain = ldb.Dn(ctx.samdb, ctx.base_dn).canonical_str().split('/')[0]
 445     ctx.realm = ctx.dnsdomain
 446     ctx.dnshostname = "%s.%s" % (ctx.myname, ctx.dnsdomain)
 447
 448     ctx.acct_dn = "CN=%s,OU=Domain Controllers,%s" % (ctx.myname, ctx.base_dn)
 449
 450     cleanup_old_join(ctx)
 451     try:
 452         join_add_objects(ctx)
 453         join_drs_connect(ctx)
 454         join_provision(ctx)
 455         join_replicate(ctx)
 456         join_finalise(ctx)
 457     except:
 458         print "Join failed - cleaning up"
 459         cleanup_old_join(ctx)
 460         raise
 461
 462     print "Joined domain %s (SID %s) as an RODC" % (ctx.domain_name, ctx.domsid)
 463