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
  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 class join_ctx:
  35     '''hold join context variables'''
  36     pass
  37
  38 def join_rodc(server=None, creds=None, lp=None, site=None, netbios_name=None,
  39               targetdir=None):
  40     """join as a RODC"""
  41
  42     if server is None:
  43         raise Exception("You must supply a server for a RODC join")
  44
  45     def del_noerror(samdb, dn):
  46         try:
  47             samdb.delete(dn)
  48             print "Deleted %s" % dn
  49         except:
  50             pass
  51
  52     def cleanup_old_join(ctx):
  53         '''remove any DNs from a previous join'''
  54         try:
  55             # find the krbtgt link
  56             res = ctx.samdb.search(base=ctx.acct_dn, scope=ldb.SCOPE_BASE, attrs=["msDS-krbTgtLink"])
  57             del_noerror(ctx.samdb, ctx.acct_dn)
  58             del_noerror(ctx.samdb, ctx.connection_dn)
  59             del_noerror(ctx.samdb, ctx.krbtgt_dn)
  60             del_noerror(ctx.samdb, ctx.ntds_dn)
  61             del_noerror(ctx.samdb, ctx.server_dn)
  62             del_noerror(ctx.samdb, ctx.topology_dn)
  63             ctx.new_krbtgt_dn = res[0]["msDS-Krbtgtlink"][0]
  64             del_noerror(ctx.samdb, ctx.new_krbtgt_dn)
  65         except:
  66             pass
  67
  68     def get_dsServiceName(samdb):
  69         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["dsServiceName"])
  70         return res[0]["dsServiceName"][0]
  71
  72     def get_dnsHostName(samdb):
  73         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["dnsHostName"])
  74         return res[0]["dnsHostName"][0]
  75
  76     def get_mysid(samdb):
  77         res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["tokenGroups"])
  78         binsid = res[0]["tokenGroups"][0]
  79         return samdb.schema_format_value("objectSID", binsid)
  80
  81     def get_domain_name(samdb):
  82         # this should be done via CLDAP
  83         res = samdb.search(base=samdb.get_default_basedn(), scope=ldb.SCOPE_BASE, attrs=["name"])
  84         return res[0]["name"][0]
  85
  86     def do_DsBind(drs):
  87         '''make a DsBind call, returning the binding handle'''
  88         bind_info = drsuapi.DsBindInfoCtr()
  89         bind_info.length = 28
  90         bind_info.info = drsuapi.DsBindInfo28()
  91         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_BASE;
  92         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ASYNC_REPLICATION;
  93         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_REMOVEAPI;
  94         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_MOVEREQ_V2;
  95         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHG_COMPRESS;
  96         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V1;
  97         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_RESTORE_USN_OPTIMIZATION;
  98         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_KCC_EXECUTE;
  99         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRY_V2;
 100         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_LINKED_VALUE_REPLICATION;
 101         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V2;
 102         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_INSTANCE_TYPE_NOT_REQ_ON_MOD;
 103         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_CRYPTO_BIND;
 104         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_REPL_INFO;
 105         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_STRONG_ENCRYPTION;
 106         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V01;
 107         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_TRANSITIVE_MEMBERSHIP;
 108         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADD_SID_HISTORY;
 109         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_POST_BETA3;
 110         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_MEMBERSHIPS2;
 111         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V6;
 112         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_NONDOMAIN_NCS;
 113         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V8;
 114         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V5;
 115         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V6;
 116         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRYREPLY_V3;
 117         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V7;
 118         bind_info.info.supported_extensions     |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_VERIFY_OBJECT;
 119         (info, handle) = drs.DsBind(misc.GUID(drsuapi.DRSUAPI_DS_BIND_GUID), bind_info)
 120         return handle
 121
 122     def get_rodc_partial_attribute_set(ctx):
 123         '''get a list of attributes for RODC replication'''
 124         partial_attribute_set = drsuapi.DsPartialAttributeSet()
 125         partial_attribute_set.version = 1
 126
 127         ctx.attids = []
 128
 129         # the exact list of attids we send is quite critical. Note that
 130         # we do ask for the secret attributes, but set set SPECIAL_SECRET_PROCESSING
 131         # to zero them out
 132         res = ctx.local_samdb.search(base=ctx.schema_dn, scope=ldb.SCOPE_SUBTREE,
 133                                      expression="objectClass=attributeSchema",
 134                                      attrs=["lDAPDisplayName", "systemFlags",
 135                                             "searchFlags"])
 136
 137         for r in res:
 138             ldap_display_name = r["lDAPDisplayName"][0]
 139             if "systemFlags" in r:
 140                 system_flags      = r["systemFlags"][0]
 141                 if (int(system_flags) & (samba.dsdb.DS_FLAG_ATTR_NOT_REPLICATED |
 142                                          samba.dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED)):
 143                     continue
 144             search_flags = r["searchFlags"][0]
 145             if (int(search_flags) & samba.dsdb.SEARCH_FLAG_RODC_ATTRIBUTE):
 146                 continue
 147             attid = ctx.local_samdb.get_attid_from_lDAPDisplayName(ldap_display_name)
 148             ctx.attids.append(int(attid))
 149
 150         # the attids do need to be sorted, or windows doesn't return
 151         # all the attributes we need
 152         ctx.attids.sort()
 153         partial_attribute_set.attids         = ctx.attids
 154         partial_attribute_set.num_attids = len(ctx.attids)
 155         return partial_attribute_set
 156
 157
 158     def replicate_partition(ctx, dn, schema=False, exop=drsuapi.DRSUAPI_EXOP_NONE):
 159         '''replicate a partition'''
 160
 161         # setup for a GetNCChanges call
 162         req8 = drsuapi.DsGetNCChangesRequest8()
 163
 164         req8.destination_dsa_guid           = ctx.ntds_guid
 165         req8.source_dsa_invocation_id       = misc.GUID(ctx.samdb.get_invocation_id())
 166         req8.naming_context                 = drsuapi.DsReplicaObjectIdentifier()
 167         req8.naming_context.dn              = dn.decode("utf-8")
 168         req8.highwatermark                  = drsuapi.DsReplicaHighWaterMark()
 169         req8.highwatermark.tmp_highest_usn  = 0
 170         req8.highwatermark.reserved_usn     = 0
 171         req8.highwatermark.highest_usn      = 0
 172         req8.uptodateness_vector            = None
 173         if exop == drsuapi.DRSUAPI_EXOP_REPL_SECRET:
 174             req8.replica_flags              = 0
 175         else:
 176             req8.replica_flags              =  (drsuapi.DRSUAPI_DRS_INIT_SYNC |
 177                                                 drsuapi.DRSUAPI_DRS_PER_SYNC |
 178                                                 drsuapi.DRSUAPI_DRS_GET_ANC |
 179                                                 drsuapi.DRSUAPI_DRS_NEVER_SYNCED |
 180                                                 drsuapi.DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING)
 181         req8.max_object_count                = 402
 182         req8.max_ndr_size                    = 402116
 183         req8.extended_op                     = exop
 184         req8.fsmo_info                       = 0
 185         req8.partial_attribute_set           = None
 186         req8.partial_attribute_set_ex        = None
 187         req8.mapping_ctr.num_mappings        = 0
 188         req8.mapping_ctr.mappings            = None
 189
 190         while True:
 191             if not schema:
 192                 req8.partial_attribute_set = get_rodc_partial_attribute_set(ctx)
 193
 194             (level, ctr) = ctx.drs.DsGetNCChanges(ctx.drs_handle, 8, req8)
 195             ctx.net.replicate_chunk(ctx.replication_state, level, ctr, schema=schema)
 196             if ctr.more_data == 0:
 197                 break
 198             req8.highwatermark.tmp_highest_usn = ctr.new_highwatermark.tmp_highest_usn
 199
 200
 201     def join_add_objects(ctx):
 202         '''add the various objects needed for the join'''
 203         print "Adding %s" % ctx.acct_dn
 204         rec = {
 205             "dn" : ctx.acct_dn,
 206             "objectClass": "computer",
 207             "displayname": ctx.samname,
 208             "samaccountname" : ctx.samname,
 209             "useraccountcontrol" : str(samba.dsdb.UF_WORKSTATION_TRUST_ACCOUNT |
 210                                        samba.dsdb.UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION |
 211                                        samba.dsdb.UF_PARTIAL_SECRETS_ACCOUNT),
 212             "managedby" : ctx.admin_dn,
 213             "dnshostname" : ctx.dnshostname,
 214             "msDS-NeverRevealGroup" : ctx.never_reveal_sid,
 215             "msDS-RevealOnDemandGroup" : ctx.reveal_sid}
 216         ctx.samdb.add(rec)
 217
 218         print "Adding %s" % ctx.krbtgt_dn
 219         rec = {
 220             "dn" : ctx.krbtgt_dn,
 221             "objectclass" : "user",
 222             "useraccountcontrol" : str(samba.dsdb.UF_NORMAL_ACCOUNT |
 223                                        samba.dsdb.UF_ACCOUNTDISABLE),
 224             "showinadvancedviewonly" : "TRUE",
 225             "description" : "tricky account"}
 226         ctx.samdb.add(rec, ["rodc_join:1:1"])
 227
 228         # now we need to search for the samAccountName attribute on the krbtgt DN,
 229         # as this will have been magically set to the krbtgt number
 230         res = ctx.samdb.search(base=ctx.krbtgt_dn, scope=ldb.SCOPE_BASE, attrs=["samAccountName"])
 231         ctx.krbtgt_name = res[0]["samAccountName"][0]
 232
 233         print "Got krbtgt_name=%s" % ctx.krbtgt_name
 234
 235         m = ldb.Message()
 236         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 237         m["msDS-krbTgtLink"] = ldb.MessageElement(ctx.krbtgt_dn,
 238                                                   ldb.FLAG_MOD_REPLACE, "msDS-krbTgtLink")
 239         ctx.samdb.modify(m)
 240
 241         ctx.new_krbtgt_dn = "CN=%s,CN=Users,%s" % (ctx.krbtgt_name, ctx.base_dn)
 242         print "Renaming %s to %s" % (ctx.krbtgt_dn, ctx.new_krbtgt_dn)
 243         ctx.samdb.rename(ctx.krbtgt_dn, ctx.new_krbtgt_dn)
 244
 245         print "Adding %s" % ctx.server_dn
 246         rec = {
 247             "dn": ctx.server_dn,
 248             "objectclass" : "server",
 249             "systemFlags" : str(samba.dsdb.SYSTEM_FLAG_CONFIG_ALLOW_RENAME |
 250                                 samba.dsdb.SYSTEM_FLAG_CONFIG_ALLOW_LIMITED_MOVE |
 251                                 samba.dsdb.SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE),
 252             "serverReference" : ctx.acct_dn,
 253             "dnsHostName" : ctx.dnshostname}
 254         ctx.samdb.add(rec)
 255
 256         print "Adding %s" % ctx.ntds_dn
 257         rec = {
 258             "dn" : ctx.ntds_dn,
 259             "objectclass" : "nTDSDSA",
 260             "objectCategory" : "CN=NTDS-DSA-RO,%s" % ctx.schema_dn,
 261             "systemFlags" : str(samba.dsdb.SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE),
 262             "dMDLocation" : ctx.schema_dn,
 263             "options" : "37",
 264             "msDS-Behavior-Version" : "4",
 265             "msDS-HasDomainNCs" : ctx.base_dn,
 266             "msDS-HasFullReplicaNCs" : [ ctx.base_dn, ctx.config_dn, ctx.schema_dn ]}
 267         ctx.samdb.add(rec, ["rodc_join:1:1"])
 268
 269         # find the GUID of our NTDS DN
 270         res = ctx.samdb.search(base=ctx.ntds_dn, scope=ldb.SCOPE_BASE, attrs=["objectGUID"])
 271         ctx.ntds_guid = misc.GUID(ctx.samdb.schema_format_value("objectGUID", res[0]["objectGUID"][0]))
 272
 273         print "Adding %s" % ctx.connection_dn
 274         rec = {
 275             "dn" : ctx.connection_dn,
 276             "objectclass" : "nTDSConnection",
 277             "enabledconnection" : "TRUE",
 278             "options" : "65",
 279             "fromServer" : ctx.dc_ntds_dn}
 280         ctx.samdb.add(rec)
 281
 282         print "Adding %s" % ctx.topology_dn
 283         rec = {
 284             "dn" : ctx.topology_dn,
 285             "objectclass" : "msDFSR-Member",
 286             "msDFSR-ComputerReference" : ctx.acct_dn,
 287             "serverReference" : ctx.ntds_dn}
 288         ctx.samdb.add(rec)
 289
 290         print "Adding HOST SPNs to %s" % ctx.acct_dn
 291         m = ldb.Message()
 292         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 293         SPNs = [ "HOST/%s" % ctx.myname,
 294                  "HOST/%s" % ctx.dnshostname ]
 295         m["servicePrincipalName"] = ldb.MessageElement(SPNs,
 296                                                        ldb.FLAG_MOD_ADD,
 297                                                        "servicePrincipalName")
 298         ctx.samdb.modify(m)
 299
 300         print "Adding RestrictedKrbHost SPNs to %s" % ctx.acct_dn
 301         m = ldb.Message()
 302         m.dn = ldb.Dn(ctx.samdb, ctx.acct_dn)
 303         SPNs = [ "RestrictedKrbHost/%s" % ctx.myname,
 304                  "RestrictedKrbHost/%s" % ctx.dnshostname ]
 305         m["servicePrincipalName"] = ldb.MessageElement(SPNs,
 306                                                        ldb.FLAG_MOD_ADD,
 307                                                        "servicePrincipalName")
 308         ctx.samdb.modify(m)
 309
 310         print "Setting account password for %s" % ctx.samname
 311         ctx.samdb.setpassword("(&(objectClass=user)(sAMAccountName=%s))" % ctx.samname,
 312                               ctx.acct_pass,
 313                               force_change_at_next_login=False,
 314                               username=ctx.samname)
 315
 316
 317     def join_drs_connect(ctx):
 318         '''connect to DRSUAPI'''
 319         print "Doing DsBind as %s" % ctx.samname
 320         ctx.acct_creds = Credentials()
 321         ctx.acct_creds.guess(ctx.lp)
 322         ctx.acct_creds.set_kerberos_state(DONT_USE_KERBEROS)
 323         ctx.acct_creds.set_username(ctx.samname)
 324         ctx.acct_creds.set_password(ctx.acct_pass)
 325
 326         ctx.drs = drsuapi.drsuapi("ncacn_ip_tcp:%s[seal,print]" % ctx.server, ctx.lp, ctx.acct_creds)
 327         ctx.drs_handle = do_DsBind(ctx.drs)
 328
 329
 330     def join_provision(ctx):
 331         '''provision the local SAM'''
 332
 333         print "Calling bare provision"
 334
 335         setup_dir = find_setup_dir()
 336         logger = logging.getLogger("provision")
 337         logger.addHandler(logging.StreamHandler(sys.stdout))
 338         smbconf = lp.configfile
 339
 340         presult = provision(setup_dir, logger, system_session(), None,
 341                             smbconf=smbconf, targetdir=targetdir, samdb_fill=FILL_DRS,
 342                             realm=ctx.realm, rootdn=ctx.root_dn, domaindn=ctx.base_dn,
 343                             schemadn=ctx.schema_dn,
 344                             configdn=ctx.config_dn,
 345                             serverdn=ctx.server_dn, domain=ctx.domain_name,
 346                             hostname=ctx.myname, hostip="127.0.0.1", domainsid=ctx.domsid,
 347                             machinepass=ctx.acct_pass, serverrole="domain controller",
 348                             sitename=ctx.site)
 349         print "Provision OK for domain DN %s" % presult.domaindn
 350         ctx.local_samdb = presult.samdb
 351         ctx.lp          = presult.lp
 352
 353
 354     def join_replicate(ctx):
 355         '''replicate the SAM'''
 356
 357         print "Starting replication"
 358         ctx.local_samdb.transaction_start()
 359
 360         ctx.replication_state = ctx.net.replicate_init(ctx.local_samdb, ctx.lp, ctx.drs)
 361
 362         replicate_partition(ctx, ctx.schema_dn, schema=True)
 363         replicate_partition(ctx, ctx.config_dn)
 364         replicate_partition(ctx, ctx.base_dn)
 365         replicate_partition(ctx, ctx.acct_dn, exop=drsuapi.DRSUAPI_EXOP_REPL_SECRET)
 366         replicate_partition(ctx, ctx.new_krbtgt_dn, exop=drsuapi.DRSUAPI_EXOP_REPL_SECRET)
 367
 368         print "Committing SAM database"
 369         ctx.local_samdb.transaction_commit()
 370
 371
 372     # main join code
 373     ctx = join_ctx()
 374     ctx.creds = creds
 375     ctx.lp = lp
 376     ctx.site = site
 377     ctx.netbios_name = netbios_name
 378     ctx.targetdir = targetdir
 379     ctx.server = server
 380
 381     ctx.creds.set_gensec_features(creds.get_gensec_features() | gensec.FEATURE_SEAL)
 382
 383     ctx.samdb = SamDB(url="ldap://%s" % ctx.server,
 384                       session_info=system_session(),
 385                       credentials=ctx.creds, lp=ctx.lp)
 386     ctx.net = Net(creds=ctx.creds, lp=ctx.lp)
 387
 388     ctx.myname = netbios_name
 389     ctx.samname = "%s$" % ctx.myname
 390     ctx.base_dn = str(ctx.samdb.get_default_basedn())
 391     ctx.root_dn = str(ctx.samdb.get_root_basedn())
 392     ctx.schema_dn = str(ctx.samdb.get_schema_basedn())
 393     ctx.config_dn = str(ctx.samdb.get_config_basedn())
 394     ctx.domsid = ctx.samdb.get_domain_sid()
 395     ctx.domain_name = get_domain_name(ctx.samdb)
 396
 397     ctx.dc_ntds_dn = get_dsServiceName(ctx.samdb)
 398     ctx.dc_dnsHostName = get_dnsHostName(ctx.samdb)
 399     ctx.acct_pass = samba.generate_random_password(12, 32)
 400     ctx.mysid = get_mysid(ctx.samdb)
 401
 402     # work out the DNs of all the objects we will be adding
 403     ctx.admin_dn = "<SID=%s>" % ctx.mysid
 404     ctx.krbtgt_dn = "CN=krbtgt_%s,CN=Users,%s" % (ctx.myname, ctx.base_dn)
 405     ctx.server_dn = "CN=%s,CN=Servers,CN=%s,CN=Sites,%s" % (ctx.myname, ctx.site, ctx.config_dn)
 406     ctx.ntds_dn = "CN=NTDS Settings,%s" % ctx.server_dn
 407     ctx.connection_dn = "CN=RODC Connection (FRS),%s" % ctx.ntds_dn
 408     ctx.topology_dn = "CN=%s,CN=Topology,CN=Domain System Volume,CN=DFSR-GlobalSettings,CN=System,%s" % (ctx.myname, ctx.base_dn)
 409
 410     # setup some defaults for accounts that should be replicated to this RODC
 411     ctx.never_reveal_sid = [ "<SID=%s-%s>" % (ctx.domsid, security.DOMAIN_RID_RODC_DENY),
 412                              "<SID=%s>" % security.SID_BUILTIN_ADMINISTRATORS,
 413                              "<SID=%s>" % security.SID_BUILTIN_SERVER_OPERATORS,
 414                              "<SID=%s>" % security.SID_BUILTIN_BACKUP_OPERATORS,
 415                              "<SID=%s>" % security.SID_BUILTIN_ACCOUNT_OPERATORS ]
 416     ctx.reveal_sid = "<SID=%s-571>" % ctx.domsid;
 417
 418     ctx.dnsdomain = ldb.Dn(ctx.samdb, ctx.base_dn).canonical_str().split('/')[0]
 419     ctx.realm = ctx.dnsdomain
 420     ctx.dnshostname = "%s.%s" % (ctx.myname, ctx.dnsdomain)
 421
 422     ctx.acct_dn = "CN=%s,OU=Domain Controllers,%s" % (ctx.myname, ctx.base_dn)
 423
 424     cleanup_old_join(ctx)
 425     try:
 426         join_add_objects(ctx)
 427         join_drs_connect(ctx)
 428         join_provision(ctx)
 429         join_replicate(ctx)
 430     except:
 431         print "Join failed - cleaning up"
 432         cleanup_old_join(ctx)
 433         raise
 434
 435     print "Joined domain %s (SID %s) as an RODC" % (ctx.domain_name, ctx.domsid)
 436