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#
# Unix SMB/CIFS implementation.
# backend code for provisioning a Samba4 server
#
# Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008-2009
# Copyright (C) Oliver Liebel <oliver@itc.li> 2008-2009
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""Functions for setting up a Samba Schema."""
from base64 import b64encode
from samba import read_and_sub_file, substitute_var, check_all_substituted
from samba.dcerpc import security
from samba.ms_schema import read_ms_schema
from samba.ndr import ndr_pack
from samba.samdb import SamDB
from samba.common import get_string
from samba import dsdb
from ldb import SCOPE_SUBTREE, SCOPE_ONELEVEL
def get_schema_descriptor(domain_sid, name_map=None):
if name_map is None:
name_map = {}
sddl = "O:SAG:SAD:AI(OA;;CR;e12b56b6-0a95-11d1-adbb-00c04fd8d5cd;;SA)" \
"(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
"(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
"(OA;;CR;1131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
"(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
"(OA;;CR;1131f6ab-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
"(OA;;CR;1131f6ac-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
"(A;CI;RPLCLORC;;;AU)" \
"(A;CI;RPWPCRCCLCLORCWOWDSW;;;SA)" \
"(A;CI;RPWPCRCCDCLCLORCWOWDSDDTSW;;;SY)" \
"(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;ED)" \
"(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;ED)" \
"(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;BA)" \
"(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;BA)" \
"(OA;;CR;1131f6aa-9c07-11d1-f79f-00c04fc2dcd2;;RO)" \
"(OA;;CR;1131f6ad-9c07-11d1-f79f-00c04fc2dcd2;;RO)" \
"(OA;;CR;89e95b76-444d-4c62-991a-0facbeda640c;;RO)" \
"S:(AU;SA;WPCCDCWOWDSDDTSW;;;WD)" \
"(AU;CISA;WP;;;WD)" \
"(AU;SA;CR;;;BA)" \
"(AU;SA;CR;;;DU)" \
"(OU;SA;CR;e12b56b6-0a95-11d1-adbb-00c04fd8d5cd;;WD)" \
"(OU;SA;CR;45ec5156-db7e-47bb-b53f-dbeb2d03c40f;;WD)"
sec = security.descriptor.from_sddl(sddl, domain_sid)
return ndr_pack(sec)
class Schema(object):
# the schema files (and corresponding object version) that we know about
base_schemas = {
"2008_R2_old": ("MS-AD_Schema_2K8_R2_Attributes.txt",
"MS-AD_Schema_2K8_R2_Classes.txt",
47),
"2008_R2": ("Attributes_for_AD_DS__Windows_Server_2008_R2.ldf",
"Classes_for_AD_DS__Windows_Server_2008_R2.ldf",
47),
"2012": ("Attributes_for_AD_DS__Windows_Server_2012.ldf",
"Classes_for_AD_DS__Windows_Server_2012.ldf",
56),
"2012_R2": ("AD_DS_Attributes__Windows_Server_2012_R2.ldf",
"AD_DS_Classes__Windows_Server_2012_R2.ldf",
69),
"2016": ("AD_DS_Attributes__Windows_Server_v1803.ldf",
"AD_DS_Classes__Windows_Server_v1803.ldf",
87),
"2019": ("AD_DS_Attributes_Windows_Server_v1903.ldf",
"AD_DS_Classes_Windows_Server_v1903.ldf",
88),
}
def __init__(self, domain_sid, invocationid=None, schemadn=None,
files=None, override_prefixmap=None, additional_prefixmap=None,
base_schema=None):
from samba.provision import setup_path
"""Load schema for the SamDB from the AD schema files and
samba4_schema.ldif
:param samdb: Load a schema into a SamDB.
:param schemadn: DN of the schema
Returns the schema data loaded, to avoid double-parsing when then
needing to add it to the db
"""
if base_schema is None:
base_schema = Schema.default_base_schema()
self.base_schema = base_schema
self.schemadn = schemadn
# We need to have the am_rodc=False just to keep some warnings quiet -
# this isn't a real SAM, so it's meaningless.
self.ldb = SamDB(global_schema=False, am_rodc=False)
if invocationid is not None:
self.ldb.set_invocation_id(invocationid)
self.schema_data = read_ms_schema(
setup_path('ad-schema/%s' % Schema.base_schemas[base_schema][0]),
setup_path('ad-schema/%s' % Schema.base_schemas[base_schema][1]))
def read_file(file):
with open(file, 'rb') as data_file:
return data_file.read()
if files is not None:
self.schema_data = "".join(get_string(read_file(file))
for file in files)
self.schema_data = substitute_var(self.schema_data,
{"SCHEMADN": schemadn})
check_all_substituted(self.schema_data)
schema_version = str(Schema.get_version(base_schema))
self.schema_dn_modify = read_and_sub_file(
setup_path("provision_schema_basedn_modify.ldif"),
{"SCHEMADN": schemadn, "OBJVERSION": schema_version})
descr = b64encode(get_schema_descriptor(domain_sid)).decode('utf8')
self.schema_dn_add = read_and_sub_file(
setup_path("provision_schema_basedn.ldif"),
{"SCHEMADN": schemadn, "DESCRIPTOR": descr})
if override_prefixmap is not None:
self.prefixmap_data = override_prefixmap
else:
self.prefixmap_data = read_file(setup_path("prefixMap.txt"))
if additional_prefixmap is not None:
self.prefixmap_data += "".join("%s\n" % map for map in additional_prefixmap)
self.prefixmap_data = b64encode(self.prefixmap_data).decode('utf8')
# We don't actually add this ldif, just parse it
prefixmap_ldif = "dn: %s\nprefixMap:: %s\n\n" % (self.schemadn, self.prefixmap_data)
self.set_from_ldif(prefixmap_ldif, self.schema_data, self.schemadn)
@staticmethod
def default_base_schema():
"""Returns the default base schema to use"""
return "2012_R2"
@staticmethod
def get_version(base_schema):
"""Returns the base schema's object version, e.g. 47 for 2008_R2"""
return Schema.base_schemas[base_schema][2]
def set_from_ldif(self, pf, df, dn):
dsdb._dsdb_set_schema_from_ldif(self.ldb, pf, df, dn)
def write_to_tmp_ldb(self, schemadb_path):
self.ldb.connect(url=schemadb_path)
self.ldb.transaction_start()
try:
# These are actually ignored, as the schema has been forced
# when the ldb object was created, and that overrides this
self.ldb.add_ldif("""dn: @ATTRIBUTES
linkID: INTEGER
dn: @INDEXLIST
@IDXATTR: linkID
@IDXATTR: attributeSyntax
@IDXGUID: objectGUID
""")
schema_dn_add = self.schema_dn_add \
+ "objectGUID: 24e2ca70-b093-4ae8-84c0-2d7ac652a1b8\n"
# These bits of LDIF are supplied when the Schema object is created
self.ldb.add_ldif(schema_dn_add)
self.ldb.modify_ldif(self.schema_dn_modify)
self.ldb.add_ldif(self.schema_data)
except:
self.ldb.transaction_cancel()
raise
else:
self.ldb.transaction_commit()
# Return a hash with the forward attribute as a key and the back as the
# value
def linked_attributes(self):
return get_linked_attributes(self.schemadn, self.ldb)
def dnsyntax_attributes(self):
return get_dnsyntax_attributes(self.schemadn, self.ldb)
def convert_to_openldap(self, target, mapping):
return dsdb._dsdb_convert_schema_to_openldap(self.ldb, target, mapping)
# Return a hash with the forward attribute as a key and the back as the value
def get_linked_attributes(schemadn, schemaldb):
attrs = ["linkID", "lDAPDisplayName"]
res = schemaldb.search(
expression="(&(linkID=*)"
"(!(linkID:1.2.840.113556.1.4.803:=1))"
"(objectclass=attributeSchema)"
"(attributeSyntax=2.5.5.1))",
base=schemadn, scope=SCOPE_ONELEVEL, attrs=attrs)
attributes = {}
for i in range(0, len(res)):
expression = ("(&(objectclass=attributeSchema)(linkID=%d)"
"(attributeSyntax=2.5.5.1))" %
(int(res[i]["linkID"][0]) + 1))
target = schemaldb.searchone(basedn=schemadn,
expression=expression,
attribute="lDAPDisplayName",
scope=SCOPE_SUBTREE)
if target is not None:
attributes[str(res[i]["lDAPDisplayName"])] = target.decode('utf-8')
return attributes
def get_dnsyntax_attributes(schemadn, schemaldb):
res = schemaldb.search(
expression="(&(!(linkID=*))(objectclass=attributeSchema)(attributeSyntax=2.5.5.1))",
base=schemadn, scope=SCOPE_ONELEVEL,
attrs=["linkID", "lDAPDisplayName"])
attributes = []
for i in range(0, len(res)):
attributes.append(str(res[i]["lDAPDisplayName"]))
return attributes
def ldb_with_schema(schemadn="cn=schema,cn=configuration,dc=example,dc=com",
domainsid=None,
override_prefixmap=None):
"""Load schema for the SamDB from the AD schema files and samba4_schema.ldif
:param schemadn: DN of the schema
:param serverdn: DN of the server
Returns the schema data loaded as an object, with .ldb being a
new ldb with the schema loaded. This allows certain tests to
operate without a remote or local schema.
"""
if domainsid is None:
domainsid = security.random_sid()
else:
domainsid = security.dom_sid(domainsid)
return Schema(domainsid, schemadn=schemadn,
override_prefixmap=override_prefixmap)
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