python/samba/schema.py

   1 #
   2 # Unix SMB/CIFS implementation.
   3 # backend code for provisioning a Samba4 server
   4 #
   5 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   6 # Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008-2009
   7 # Copyright (C) Oliver Liebel <oliver@itc.li> 2008-2009
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 3 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 """Functions for setting up a Samba Schema."""
  24
  25 from base64 import b64encode
  26 from samba import read_and_sub_file, substitute_var, check_all_substituted
  27 from samba.dcerpc import security
  28 from samba.ms_schema import read_ms_schema
  29 from samba.ndr import ndr_pack
  30 from samba.samdb import SamDB
  31 from samba.compat import get_string
  32 from samba import dsdb
  33 from ldb import SCOPE_SUBTREE, SCOPE_ONELEVEL
  34
  35
  36 def get_schema_descriptor(domain_sid, name_map={}):
  37     sddl = "O:SAG:SAD:AI(OA;;CR;e12b56b6-0a95-11d1-adbb-00c04fd8d5cd;;SA)" \
  38            "(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
  39            "(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
  40            "(OA;;CR;1131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
  41            "(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
  42            "(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
  43            "(OA;;CR;1131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
  44            "(A;CI;RPLCLORC;;;AU)" \
  45            "(A;CI;RPWPCRCCLCLORCWOWDSW;;;SA)" \
  46            "(A;CI;RPWPCRCCDCLCLORCWOWDSDDTSW;;;SY)" \
  47            "(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
  48            "(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;ED)" \
  49            "(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
  50            "(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;BA)" \
  51            "(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;ER)" \
  52            "(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;ER)" \
  53            "(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;ER)" \
  54            "S:(AU;SA;WPCCDCWOWDSDDTSW;;;WD)" \
  55            "(AU;CISA;WP;;;WD)" \
  56            "(AU;SA;CR;;;BA)" \
  57            "(AU;SA;CR;;;DU)" \
  58            "(OU;SA;CR;e12b56b6-0a95-11d1-adbb-00c04fd8d5cd;;WD)" \
  59            "(OU;SA;CR;45ec5156-db7e-47bb-b53f-dbeb2d03c40f;;WD)"
  60     sec = security.descriptor.from_sddl(sddl, domain_sid)
  61     return ndr_pack(sec)
  62
  63
  64 class Schema(object):
  65
  66     # the schema files (and corresponding object version) that we know about
  67     base_schemas = {
  68         "2008_R2_old": ("MS-AD_Schema_2K8_R2_Attributes.txt",
  69                         "MS-AD_Schema_2K8_R2_Classes.txt",
  70                         47),
  71        "2008_R2": ("Attributes_for_AD_DS__Windows_Server_2008_R2.ldf",
  72                    "Classes_for_AD_DS__Windows_Server_2008_R2.ldf",
  73                    47),
  74        "2012": ("AD_DS_Attributes__Windows_Server_2012.ldf",
  75                 "AD_DS_Classes__Windows_Server_2012.ldf",
  76                 56),
  77        "2012_R2": ("AD_DS_Attributes__Windows_Server_2012_R2.ldf",
  78                    "AD_DS_Classes__Windows_Server_2012_R2.ldf",
  79                    69),
  80     }
  81
  82     def __init__(self, domain_sid, invocationid=None, schemadn=None,
  83                  files=None, override_prefixmap=None, additional_prefixmap=None,
  84                  base_schema=None):
  85         from samba.provision import setup_path
  86
  87         """Load schema for the SamDB from the AD schema files and
  88         samba4_schema.ldif
  89
  90         :param samdb: Load a schema into a SamDB.
  91         :param schemadn: DN of the schema
  92
  93         Returns the schema data loaded, to avoid double-parsing when then
  94         needing to add it to the db
  95         """
  96
  97         if base_schema is None:
  98             base_schema = Schema.default_base_schema()
  99
 100         self.base_schema = base_schema
 101
 102         self.schemadn = schemadn
 103         # We need to have the am_rodc=False just to keep some warnings quiet -
 104         # this isn't a real SAM, so it's meaningless.
 105         self.ldb = SamDB(global_schema=False, am_rodc=False)
 106         if invocationid is not None:
 107             self.ldb.set_invocation_id(invocationid)
 108
 109         self.schema_data = read_ms_schema(
 110             setup_path('ad-schema/%s' % Schema.base_schemas[base_schema][0]),
 111             setup_path('ad-schema/%s' % Schema.base_schemas[base_schema][1]))
 112
 113         if files is not None:
 114             for file in files:
 115                 data = get_string(open(file, 'rb').read())
 116                 self.schema_data += data
 117
 118         self.schema_data = substitute_var(self.schema_data,
 119                                           {"SCHEMADN": schemadn})
 120         check_all_substituted(self.schema_data)
 121
 122         schema_version = str(Schema.get_version(base_schema))
 123         self.schema_dn_modify = read_and_sub_file(
 124             setup_path("provision_schema_basedn_modify.ldif"),
 125             {"SCHEMADN": schemadn, "OBJVERSION": schema_version})
 126
 127         descr = b64encode(get_schema_descriptor(domain_sid)).decode('utf8')
 128         self.schema_dn_add = read_and_sub_file(
 129             setup_path("provision_schema_basedn.ldif"),
 130             {"SCHEMADN": schemadn, "DESCRIPTOR": descr})
 131
 132         if override_prefixmap is not None:
 133             self.prefixmap_data = override_prefixmap
 134         else:
 135             self.prefixmap_data = open(setup_path("prefixMap.txt"), 'rb').read()
 136
 137         if additional_prefixmap is not None:
 138             for map in additional_prefixmap:
 139                 self.prefixmap_data += "%s\n" % map
 140
 141         self.prefixmap_data = b64encode(self.prefixmap_data).decode('utf8')
 142
 143         # We don't actually add this ldif, just parse it
 144         prefixmap_ldif = "dn: %s\nprefixMap:: %s\n\n" % (self.schemadn, self.prefixmap_data)
 145         self.set_from_ldif(prefixmap_ldif, self.schema_data, self.schemadn)
 146
 147     @staticmethod
 148     def default_base_schema():
 149         """Returns the default base schema to use"""
 150         return "2008_R2"
 151
 152     @staticmethod
 153     def get_version(base_schema):
 154         """Returns the base schema's object version, e.g. 47 for 2008_R2"""
 155         return Schema.base_schemas[base_schema][2]
 156
 157     def set_from_ldif(self, pf, df, dn):
 158         dsdb._dsdb_set_schema_from_ldif(self.ldb, pf, df, dn)
 159
 160     def write_to_tmp_ldb(self, schemadb_path):
 161         self.ldb.connect(url=schemadb_path)
 162         self.ldb.transaction_start()
 163         try:
 164             # These are actually ignored, as the schema has been forced
 165             # when the ldb object was created, and that overrides this
 166             self.ldb.add_ldif("""dn: @ATTRIBUTES
 167 linkID: INTEGER
 168
 169 dn: @INDEXLIST
 170 @IDXATTR: linkID
 171 @IDXATTR: attributeSyntax
 172 @IDXGUID: objectGUID
 173 """)
 174
 175             schema_dn_add = self.schema_dn_add \
 176                 + "objectGUID: 24e2ca70-b093-4ae8-84c0-2d7ac652a1b8\n"
 177
 178             # These bits of LDIF are supplied when the Schema object is created
 179             self.ldb.add_ldif(schema_dn_add)
 180             self.ldb.modify_ldif(self.schema_dn_modify)
 181             self.ldb.add_ldif(self.schema_data)
 182         except:
 183             self.ldb.transaction_cancel()
 184             raise
 185         else:
 186             self.ldb.transaction_commit()
 187
 188     # Return a hash with the forward attribute as a key and the back as the
 189     # value
 190     def linked_attributes(self):
 191         return get_linked_attributes(self.schemadn, self.ldb)
 192
 193     def dnsyntax_attributes(self):
 194         return get_dnsyntax_attributes(self.schemadn, self.ldb)
 195
 196     def convert_to_openldap(self, target, mapping):
 197         return dsdb._dsdb_convert_schema_to_openldap(self.ldb, target, mapping)
 198
 199
 200 # Return a hash with the forward attribute as a key and the back as the value
 201 def get_linked_attributes(schemadn, schemaldb):
 202     attrs = ["linkID", "lDAPDisplayName"]
 203     res = schemaldb.search(
 204         expression="(&(linkID=*)"
 205                    "(!(linkID:1.2.840.113556.1.4.803:=1))"
 206                    "(objectclass=attributeSchema)"
 207                    "(attributeSyntax=2.5.5.1))",
 208         base=schemadn, scope=SCOPE_ONELEVEL, attrs=attrs)
 209     attributes = {}
 210     for i in range(0, len(res)):
 211         expression = ("(&(objectclass=attributeSchema)(linkID=%d)"
 212                       "(attributeSyntax=2.5.5.1))" %
 213                       (int(res[i]["linkID"][0]) + 1))
 214         target = schemaldb.searchone(basedn=schemadn,
 215                                      expression=expression,
 216                                      attribute="lDAPDisplayName",
 217                                      scope=SCOPE_SUBTREE)
 218         if target is not None:
 219             attributes[str(res[i]["lDAPDisplayName"])] = str(target)
 220
 221     return attributes
 222
 223
 224 def get_dnsyntax_attributes(schemadn, schemaldb):
 225     res = schemaldb.search(
 226         expression="(&(!(linkID=*))(objectclass=attributeSchema)(attributeSyntax=2.5.5.1))",
 227         base=schemadn, scope=SCOPE_ONELEVEL,
 228         attrs=["linkID", "lDAPDisplayName"])
 229     attributes = []
 230     for i in range(0, len(res)):
 231         attributes.append(str(res[i]["lDAPDisplayName"]))
 232     return attributes
 233
 234
 235 def ldb_with_schema(schemadn="cn=schema,cn=configuration,dc=example,dc=com",
 236                     domainsid=None,
 237                     override_prefixmap=None):
 238     """Load schema for the SamDB from the AD schema files and samba4_schema.ldif
 239
 240     :param schemadn: DN of the schema
 241     :param serverdn: DN of the server
 242
 243     Returns the schema data loaded as an object, with .ldb being a
 244     new ldb with the schema loaded.  This allows certain tests to
 245     operate without a remote or local schema.
 246     """
 247
 248     if domainsid is None:
 249         domainsid = security.random_sid()
 250     else:
 251         domainsid = security.dom_sid(domainsid)
 252     return Schema(domainsid, schemadn=schemadn,
 253                   override_prefixmap=override_prefixmap)