python/samba/drs_utils.py

   1 # DRS utility code
   2 #
   3 # Copyright Andrew Tridgell 2010
   4 # Copyright Andrew Bartlett 2010
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20 from samba.dcerpc import drsuapi, misc
  21 from samba.net import Net
  22 import samba, ldb
  23
  24
  25 class drsException(Exception):
  26     """Base element for drs errors"""
  27
  28     def __init__(self, value):
  29         self.value = value
  30
  31     def __str__(self):
  32         return "drsException: " + self.value
  33
  34
  35 def drsuapi_connect(server, lp, creds):
  36     """Make a DRSUAPI connection to the server.
  37
  38     :param server: the name of the server to connect to
  39     :param lp: a samba line parameter object
  40     :param creds: credential used for the connection
  41     :return: A tuple with the drsuapi bind object, the drsuapi handle
  42                 and the supported extensions.
  43     :raise drsException: if the connection fails
  44     """
  45
  46     binding_options = "seal"
  47     if lp.log_level() >= 5:
  48         binding_options += ",print"
  49     binding_string = "ncacn_ip_tcp:%s[%s]" % (server, binding_options)
  50     try:
  51         drsuapiBind = drsuapi.drsuapi(binding_string, lp, creds)
  52         (drsuapiHandle, bindSupportedExtensions) = drs_DsBind(drsuapiBind)
  53     except Exception, e:
  54         raise drsException("DRS connection to %s failed: %s" % (server, e))
  55
  56     return (drsuapiBind, drsuapiHandle, bindSupportedExtensions)
  57
  58
  59 def sendDsReplicaSync(drsuapiBind, drsuapi_handle, source_dsa_guid,
  60         naming_context, req_option):
  61     """Send DS replica sync request.
  62
  63     :param drsuapiBind: a drsuapi Bind object
  64     :param drsuapi_handle: a drsuapi hanle on the drsuapi connection
  65     :param source_dsa_guid: the guid of the source dsa for the replication
  66     :param naming_context: the DN of the naming context to replicate
  67     :param req_options: replication options for the DsReplicaSync call
  68     :raise drsException: if any error occur while sending and receiving the
  69         reply for the dsReplicaSync
  70     """
  71
  72     nc = drsuapi.DsReplicaObjectIdentifier()
  73     nc.dn = naming_context
  74
  75     req1 = drsuapi.DsReplicaSyncRequest1()
  76     req1.naming_context = nc;
  77     req1.options = req_option
  78     req1.source_dsa_guid = misc.GUID(source_dsa_guid)
  79
  80     try:
  81         drsuapiBind.DsReplicaSync(drsuapi_handle, 1, req1)
  82     except Exception, estr:
  83         raise drsException("DsReplicaSync failed %s" % estr)
  84
  85
  86 def sendRemoveDsServer(drsuapiBind, drsuapi_handle, server_dsa_dn, domain):
  87     """Send RemoveDSServer request.
  88
  89     :param drsuapiBind: a drsuapi Bind object
  90     :param drsuapi_handle: a drsuapi hanle on the drsuapi connection
  91     :param server_dsa_dn: a DN object of the server's dsa that we want to
  92         demote
  93     :param domain: a DN object of the server's domain
  94     :raise drsException: if any error occur while sending and receiving the
  95         reply for the DsRemoveDSServer
  96     """
  97
  98     try:
  99         req1 = drsuapi.DsRemoveDSServerRequest1()
 100         req1.server_dn = str(server_dsa_dn)
 101         req1.domain_dn = str(domain)
 102         req1.commit = 1
 103
 104         drsuapiBind.DsRemoveDSServer(drsuapi_handle, 1, req1)
 105     except Exception, estr:
 106         raise drsException("DsRemoveDSServer failed %s" % estr)
 107
 108
 109 def drs_DsBind(drs):
 110     '''make a DsBind call, returning the binding handle'''
 111     bind_info = drsuapi.DsBindInfoCtr()
 112     bind_info.length = 28
 113     bind_info.info = drsuapi.DsBindInfo28()
 114     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_BASE
 115     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ASYNC_REPLICATION
 116     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_REMOVEAPI
 117     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_MOVEREQ_V2
 118     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHG_COMPRESS
 119     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V1
 120     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_RESTORE_USN_OPTIMIZATION
 121     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_KCC_EXECUTE
 122     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRY_V2
 123     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_LINKED_VALUE_REPLICATION
 124     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V2
 125     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_INSTANCE_TYPE_NOT_REQ_ON_MOD
 126     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_CRYPTO_BIND
 127     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_REPL_INFO
 128     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_STRONG_ENCRYPTION
 129     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_DCINFO_V01
 130     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_TRANSITIVE_MEMBERSHIP
 131     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADD_SID_HISTORY
 132     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_POST_BETA3
 133     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GET_MEMBERSHIPS2
 134     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V6
 135     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_NONDOMAIN_NCS
 136     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V8
 137     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V5
 138     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V6
 139     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_ADDENTRYREPLY_V3
 140     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREPLY_V7
 141     bind_info.info.supported_extensions |= drsuapi.DRSUAPI_SUPPORTED_EXTENSION_VERIFY_OBJECT
 142     (info, handle) = drs.DsBind(misc.GUID(drsuapi.DRSUAPI_DS_BIND_GUID), bind_info)
 143
 144     return (handle, info.info.supported_extensions)
 145
 146
 147 def drs_get_rodc_partial_attribute_set(samdb):
 148     '''get a list of attributes for RODC replication'''
 149     partial_attribute_set = drsuapi.DsPartialAttributeSet()
 150     partial_attribute_set.version = 1
 151
 152     attids = []
 153
 154     # the exact list of attids we send is quite critical. Note that
 155     # we do ask for the secret attributes, but set SPECIAL_SECRET_PROCESSING
 156     # to zero them out
 157     schema_dn = samdb.get_schema_basedn()
 158     res = samdb.search(base=schema_dn, scope=ldb.SCOPE_SUBTREE,
 159                        expression="objectClass=attributeSchema",
 160                        attrs=["lDAPDisplayName", "systemFlags",
 161                               "searchFlags"])
 162
 163     for r in res:
 164         ldap_display_name = r["lDAPDisplayName"][0]
 165         if "systemFlags" in r:
 166             system_flags      = r["systemFlags"][0]
 167             if (int(system_flags) & (samba.dsdb.DS_FLAG_ATTR_NOT_REPLICATED |
 168                                      samba.dsdb.DS_FLAG_ATTR_IS_CONSTRUCTED)):
 169                 continue
 170         if "searchFlags" in r:
 171             search_flags = r["searchFlags"][0]
 172             if (int(search_flags) & samba.dsdb.SEARCH_FLAG_RODC_ATTRIBUTE):
 173                 continue
 174         attid = samdb.get_attid_from_lDAPDisplayName(ldap_display_name)
 175         attids.append(int(attid))
 176
 177     # the attids do need to be sorted, or windows doesn't return
 178     # all the attributes we need
 179     attids.sort()
 180     partial_attribute_set.attids         = attids
 181     partial_attribute_set.num_attids = len(attids)
 182     return partial_attribute_set
 183
 184
 185 class drs_Replicate(object):
 186     '''DRS replication calls'''
 187
 188     def __init__(self, binding_string, lp, creds, samdb, invocation_id):
 189         self.drs = drsuapi.drsuapi(binding_string, lp, creds)
 190         (self.drs_handle, self.supported_extensions) = drs_DsBind(self.drs)
 191         self.net = Net(creds=creds, lp=lp)
 192         self.samdb = samdb
 193         if not isinstance(invocation_id, misc.GUID):
 194             raise RuntimeError("Must supply GUID for invocation_id")
 195         if invocation_id == misc.GUID("00000000-0000-0000-0000-000000000000"):
 196             raise RuntimeError("Must not set GUID 00000000-0000-0000-0000-000000000000 as invocation_id")
 197         self.replication_state = self.net.replicate_init(self.samdb, lp, self.drs, invocation_id)
 198
 199     def replicate(self, dn, source_dsa_invocation_id, destination_dsa_guid,
 200                   schema=False, exop=drsuapi.DRSUAPI_EXOP_NONE, rodc=False,
 201                   replica_flags=None):
 202         '''replicate a single DN'''
 203
 204         # setup for a GetNCChanges call
 205         req8 = drsuapi.DsGetNCChangesRequest8()
 206
 207         req8.destination_dsa_guid = destination_dsa_guid
 208         req8.source_dsa_invocation_id = source_dsa_invocation_id
 209         req8.naming_context = drsuapi.DsReplicaObjectIdentifier()
 210         req8.naming_context.dn = dn
 211         req8.highwatermark = drsuapi.DsReplicaHighWaterMark()
 212         req8.highwatermark.tmp_highest_usn = 0
 213         req8.highwatermark.reserved_usn = 0
 214         req8.highwatermark.highest_usn = 0
 215         req8.uptodateness_vector = None
 216         if replica_flags is not None:
 217             req8.replica_flags = replica_flags
 218         elif exop == drsuapi.DRSUAPI_EXOP_REPL_SECRET:
 219             req8.replica_flags = 0
 220         else:
 221             req8.replica_flags = (drsuapi.DRSUAPI_DRS_INIT_SYNC |
 222                                   drsuapi.DRSUAPI_DRS_PER_SYNC |
 223                                   drsuapi.DRSUAPI_DRS_GET_ANC |
 224                                   drsuapi.DRSUAPI_DRS_NEVER_SYNCED |
 225                                   drsuapi.DRSUAPI_DRS_GET_ALL_GROUP_MEMBERSHIP)
 226             if rodc:
 227                 req8.replica_flags |= (
 228                     drsuapi.DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING)
 229             else:
 230                 req8.replica_flags |= drsuapi.DRSUAPI_DRS_WRIT_REP
 231         req8.max_object_count = 402
 232         req8.max_ndr_size = 402116
 233         req8.extended_op = exop
 234         req8.fsmo_info = 0
 235         req8.partial_attribute_set = None
 236         req8.partial_attribute_set_ex = None
 237         req8.mapping_ctr.num_mappings = 0
 238         req8.mapping_ctr.mappings = None
 239
 240         if not schema and rodc:
 241             req8.partial_attribute_set = drs_get_rodc_partial_attribute_set(self.samdb)
 242
 243         if self.supported_extensions & drsuapi.DRSUAPI_SUPPORTED_EXTENSION_GETCHGREQ_V8:
 244             req_level = 8
 245             req = req8
 246         else:
 247             req_level = 5
 248             req5 = drsuapi.DsGetNCChangesRequest5()
 249             for a in dir(req5):
 250                 if a[0] != '_':
 251                     setattr(req5, a, getattr(req8, a))
 252             req = req5
 253
 254         while True:
 255             (level, ctr) = self.drs.DsGetNCChanges(self.drs_handle, req_level, req)
 256             if ctr.first_object is None and ctr.object_count != 0:
 257                 raise RuntimeError("DsGetNCChanges: NULL first_object with object_count=%u" % (ctr.object_count))
 258             self.net.replicate_chunk(self.replication_state, level, ctr,
 259                 schema=schema, req_level=req_level, req=req)
 260             if ctr.more_data == 0:
 261                 break
 262             req.highwatermark = ctr.new_highwatermark