# Samba4 Forest update checker # # Copyright (C) Andrew Bartlett 2017 # # 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 . # import ldb import samba from samba import sd_utils from samba.ndr import ndr_unpack, ndr_pack from samba.dcerpc import security from samba.dcerpc.security import SECINFO_DACL from samba.provision.common import setup_path from samba.dsdb import ( DS_DOMAIN_FUNCTION_2008, DS_DOMAIN_FUNCTION_2008_R2, DS_DOMAIN_FUNCTION_2012, DS_DOMAIN_FUNCTION_2012_R2, DS_DOMAIN_FUNCTION_2016, ) MIN_UPDATE = 45 MAX_UPDATE = 135 update_map = { # Missing updates from 2008 + 2008 R2 53: "134428a8-0043-48a6-bcda-63310d9ec4dd", 79: "21ae657c-6649-43c4-bbb3-7f184fdf58c1", 80: "dca8f425-baae-47cd-b424-e3f6c76ed08b", 81: "a662b036-dbbe-4166-b4ba-21abea17f9cc", 82: "9d17b863-18c3-497d-9bde-45ddb95fcb65", 83: "11c39bed-4bee-45f5-b195-8da0e05b573a", # Windows Server 2012 - version 11 84: "4664e973-cb20-4def-b3d5-559d6fe123e0", 85: "2972d92d-a07a-44ac-9cb0-bf243356f345", 86: "09a49cb3-6c54-4b83-ab20-8370838ba149", 87: "77283e65-ce02-4dc3-8c1e-bf99b22527c2", 88: "0afb7f53-96bd-404b-a659-89e65c269420", 89: "c7f717ef-fdbe-4b4b-8dfc-fa8b839fbcfa", 90: "00232167-f3a4-43c6-b503-9acb7a81b01c", 91: "73a9515b-511c-44d2-822b-444a33d3bd33", 92: "e0c60003-2ed7-4fd3-8659-7655a7e79397", 93: "ed0c8cca-80ab-4b6b-ac5a-59b1d317e11f", 94: "b6a6c19a-afc9-476b-8994-61f5b14b3f05", 95: "defc28cd-6cb6-4479-8bcb-aabfb41e9713", 96: "d6bd96d4-e66b-4a38-9c6b-e976ff58c56d", 97: "bb8efc40-3090-4fa2-8a3f-7cd1d380e695", 98: "2d6abe1b-4326-489e-920c-76d5337d2dc5", 99: "6b13dfb5-cecc-4fb8-b28d-0505cea24175", 100: "92e73422-c68b-46c9-b0d5-b55f9c741410", 101: "c0ad80b4-8e84-4cc4-9163-2f84649bcc42", 102: "992fe1d0-6591-4f24-a163-c820fcb7f308", 103: "ede85f96-7061-47bf-b11b-0c0d999595b5", 104: "ee0f3271-eb51-414a-bdac-8f9ba6397a39", 105: "587d52e0-507e-440e-9d67-e6129f33bb68", 106: "ce24f0f6-237e-43d6-ac04-1e918ab04aac", 107: "7f77d431-dd6a-434f-ae4d-ce82928e498f", 108: "ba14e1f6-7cd1-4739-804f-57d0ea74edf4", 109: "156ffa2a-e07c-46fb-a5c4-fbd84a4e5cce", 110: "7771d7dd-2231-4470-aa74-84a6f56fc3b6", 111: "49b2ae86-839a-4ea0-81fe-9171c1b98e83", 112: "1b1de989-57ec-4e96-b933-8279a8119da4", 113: "281c63f0-2c9a-4cce-9256-a238c23c0db9", 114: "4c47881a-f15a-4f6c-9f49-2742f7a11f4b", 115: "2aea2dc6-d1d3-4f0c-9994-66c1da21de0f", 116: "ae78240c-43b9-499e-ae65-2b6e0f0e202a", 117: "261b5bba-3438-4d5c-a3e9-7b871e5f57f0", 118: "3fb79c05-8ea1-438c-8c7a-81f213aa61c2", 119: "0b2be39a-d463-4c23-8290-32186759d3b1", 120: "f0842b44-bc03-46a1-a860-006e8527fccd", 121: "93efec15-4dd9-4850-bc86-a1f2c8e2ebb9", 122: "9e108d96-672f-40f0-b6bd-69ee1f0b7ac4", 123: "1e269508-f862-4c4a-b01f-420d26c4ff8c", 125: "e1ab17ed-5efb-4691-ad2d-0424592c5755", 126: "0e848bd4-7c70-48f2-b8fc-00fbaa82e360", 127: "016f23f7-077d-41fa-a356-de7cfdb01797", 128: "49c140db-2de3-44c2-a99a-bab2e6d2ba81", 129: "e0b11c80-62c5-47f7-ad0d-3734a71b8312", 130: "2ada1a2d-b02f-4731-b4fe-59f955e24f71", # Windows Server 2012 R2 - version 15 131: "b83818c1-01a6-4f39-91b7-a3bb581c3ae3", 132: "bbbb9db0-4009-4368-8c40-6674e980d3c3", 133: "f754861c-3692-4a7b-b2c2-d0fa28ed0b0b", 134: "d32f499f-3026-4af0-a5bd-13fe5a331bd2", 135: "38618886-98ee-4e42-8cf1-d9a2cd9edf8b", # Windows Server 2016 - version 16 136: "328092FB-16E7-4453-9AB8-7592DB56E9C4", 137: "3A1C887F-DF0A-489F-B3F2-2D0409095F6E", 138: "232E831F-F988-4444-8E3E-8A352E2FD411", 139: "DDDDCF0C-BEC9-4A5A-AE86-3CFE6CC6E110", 140: "A0A45AAC-5550-42DF-BB6A-3CC5C46B52F2", 141: "3E7645F3-3EA5-4567-B35A-87630449C70C", 142: "E634067B-E2C4-4D79-B6E8-73C619324D5E" } functional_level_to_max_update = { DS_DOMAIN_FUNCTION_2008: 78, DS_DOMAIN_FUNCTION_2008_R2: 83, DS_DOMAIN_FUNCTION_2012: 130, DS_DOMAIN_FUNCTION_2012_R2: 135, DS_DOMAIN_FUNCTION_2016: 142, } functional_level_to_version = { DS_DOMAIN_FUNCTION_2008: 2, DS_DOMAIN_FUNCTION_2008_R2: 5, DS_DOMAIN_FUNCTION_2012: 11, DS_DOMAIN_FUNCTION_2012_R2: 15, DS_DOMAIN_FUNCTION_2016: 16, } # Documentation says that this update was deprecated missing_updates = [124] class ForestUpdateException(Exception): pass class ForestUpdate(object): """Check and update a SAM database for forest updates""" def __init__(self, samdb, verbose=False, fix=False, add_update_container=True): """ :param samdb: LDB database :param verbose: Show the ldif changes :param fix: Apply the update if the container is missing :param add_update_container: Add the container at the end of the change :raise ForestUpdateException: """ from samba.ms_forest_updates_markdown import read_ms_markdown self.samdb = samdb self.fix = fix self.verbose = verbose self.add_update_container = add_update_container # TODO In future we should check for inconsistencies when it claims it has been done self.check_update_applied = False self.config_dn = self.samdb.get_config_basedn() self.domain_dn = self.samdb.domain_dn() self.schema_dn = self.samdb.get_schema_basedn() self.sd_utils = sd_utils.SDUtils(samdb) self.domain_sid = security.dom_sid(samdb.get_domain_sid()) self.forestupdate_container = self.samdb.get_config_basedn() if not self.forestupdate_container.add_child("CN=Operations,CN=ForestUpdates"): raise ForestUpdateException("Failed to add forest update container child") self.revision_object = self.samdb.get_config_basedn() if not self.revision_object.add_child("CN=ActiveDirectoryUpdate,CN=ForestUpdates"): raise ForestUpdateException("Failed to add revision object child") # Store the result of parsing the markdown in a dictionary self.stored_ldif = {} read_ms_markdown(setup_path("adprep/WindowsServerDocs/Forest-Wide-Updates.md"), out_dict=self.stored_ldif) def check_updates_functional_level(self, functional_level, old_functional_level=None, update_revision=False): """ Apply all updates for a given old and new functional level :param functional_level: constant :param old_functional_level: constant :param update_revision: modify the stored version :raise ForestUpdateException: """ res = self.samdb.search(base=self.revision_object, attrs=["revision"], scope=ldb.SCOPE_BASE) expected_update = functional_level_to_max_update[functional_level] if old_functional_level: min_update = functional_level_to_max_update[old_functional_level] min_update += 1 else: min_update = MIN_UPDATE self.check_updates_range(min_update, expected_update) expected_version = functional_level_to_version[functional_level] found_version = int(res[0]['revision'][0]) if update_revision and found_version < expected_version: if not self.fix: raise ForestUpdateException("Revision is not high enough. Fix is set to False." "\nExpected: %dGot: %d" % (expected_version, found_version)) self.samdb.modify_ldif("""dn: %s changetype: modify replace: revision revision: %d """ % (str(self.revision_object), expected_version)) def check_updates_iterator(self, iterator): """ Apply a list of updates which must be within the valid range of updates :param iterator: Iterable specifying integer update numbers to apply :raise ForestUpdateException: """ for op in iterator: if op < MIN_UPDATE or op > MAX_UPDATE: raise ForestUpdateException("Update number invalid.") if 84 <= op <= 87: self.operation_ldif(op) elif 91 <= op <= 126: self.operation_ldif(op) elif 131 <= op <= 134: self.operation_ldif(op) else: # No LDIF file exists for the change getattr(self, "operation_%d" % op)(op) def check_updates_range(self, start=0, end=0): """ Apply a range of updates which must be within the valid range of updates :param start: integer update to begin :param end: integer update to end (inclusive) :raise ForestUpdateException: """ op = start if start < MIN_UPDATE or start > end or end > MAX_UPDATE: raise ForestUpdateException("Update number invalid.") while op <= end: if op in missing_updates: pass elif 84 <= op <= 87: self.operation_ldif(op) elif 91 <= op <= 126: self.operation_ldif(op) elif 131 <= op <= 134: self.operation_ldif(op) else: # No LDIF file exists for the change getattr(self, "operation_%d" % op)(op) op += 1 def update_exists(self, op): """ :param op: Integer update number :return: True if update exists else False """ try: res = self.samdb.search(base=self.forestupdate_container, expression="(CN=%s)" % update_map[op]) except ldb.LdbError: return False return len(res) == 1 def update_add(self, op): """ Add the corresponding container object for the given update :param op: Integer update """ self.samdb.add_ldif("""dn: CN=%s,%s objectClass: container """ % (update_map[op], str(self.forestupdate_container))) def operation_ldif(self, op): if self.update_exists(op): # Assume we have applied it (we have no double checks for these) return True ldif = self.stored_ldif[update_map[op]] sub_ldif = samba.substitute_var(ldif, {"CONFIG_DN": str(self.config_dn), "FOREST_ROOT_DOMAIN": str(self.domain_dn), "SCHEMA_DN": str(self.schema_dn)}) if self.verbose: print("UPDATE (LDIF) ------ OPERATION %d" % op) print(sub_ldif) self.samdb.modify_ldif(sub_ldif) if self.add_update_container: self.update_add(op) def insert_ace_into_dacl(self, dn, existing_sddl, ace): """ Add an ACE to a DACL, checking if it already exists with a simple string search. :param dn: DN to modify :param existing_sddl: existing sddl as string :param ace: string ace to insert :return: True if modified else False """ index = existing_sddl.rfind("S:") if index != -1: new_sddl = existing_sddl[:index] + ace + existing_sddl[index:] else: # Insert it at the end if no S: section new_sddl = existing_sddl + ace if ace in existing_sddl: return False self.sd_utils.modify_sd_on_dn(dn, new_sddl, controls=["sd_flags:1:%d" % SECINFO_DACL]) return True def insert_ace_into_string(self, dn, ace, attr): """ Insert an ACE into a string attribute like defaultSecurityDescriptor. This also checks if it already exists using a simple string search. :param dn: DN to modify :param ace: string ace to insert :param attr: attribute to modify :return: True if modified else False """ msg = self.samdb.search(base=dn, attrs=[attr], controls=["search_options:1:2"]) assert len(msg) == 1 existing_sddl = str(msg[0][attr][0]) index = existing_sddl.rfind("S:") if index != -1: new_sddl = existing_sddl[:index] + ace + existing_sddl[index:] else: # Insert it at the end if no S: section new_sddl = existing_sddl + ace if ace in existing_sddl: return False m = ldb.Message() m.dn = dn m[attr] = ldb.MessageElement(new_sddl, ldb.FLAG_MOD_REPLACE, attr) self.samdb.modify(m, controls=["relax:0"]) return True def raise_if_not_fix(self, op): """ Raises an exception if not set to fix. :param op: Integer operation :raise ForestUpdateException: """ if not self.fix: raise ForestUpdateException("Missing operation %d. Fix is currently set to False" % op) # # Created a new object CN=Sam-Domain in the Schema partition # # Created the following access control entry (ACE) to grant Write Property # to Principal Self on the object: ... # def operation_88(self, op): if self.update_exists(op): return self.raise_if_not_fix(op) ace = "(OA;CIIO;WP;ea1b7b93-5e48-46d5-bc6c-4df4fda78a35;bf967a86-0de6-11d0-a285-00aa003049e2;PS)" schema_dn = ldb.Dn(self.samdb, "CN=Sam-Domain,%s" % str(self.schema_dn)) self.insert_ace_into_string(schema_dn, ace, attr="defaultSecurityDescriptor") res = self.samdb.search(expression="(objectClass=samDomain)", attrs=["nTSecurityDescriptor"], controls=["search_options:1:2"]) for msg in res: existing_sd = ndr_unpack(security.descriptor, msg["nTSecurityDescriptor"][0]) existing_sddl = existing_sd.as_sddl(self.domain_sid) self.insert_ace_into_dacl(msg.dn, existing_sddl, ace) if self.add_update_container: self.update_add(op) # # Created a new object CN=Domain-DNS in the Schema partition # # Created the following access control entry (ACE) to grant Write Property # to Principal Self on the object: ... # def operation_89(self, op): if self.update_exists(op): return self.raise_if_not_fix(op) ace = "(OA;CIIO;WP;ea1b7b93-5e48-46d5-bc6c-4df4fda78a35;bf967a86-0de6-11d0-a285-00aa003049e2;PS)" schema_dn = ldb.Dn(self.samdb, "CN=Domain-DNS,%s" % str(self.schema_dn)) self.insert_ace_into_string(schema_dn, ace, attr="defaultSecurityDescriptor") res = self.samdb.search(expression="(objectClass=domainDNS)", attrs=["nTSecurityDescriptor"], controls=["search_options:1:2", "sd_flags:1:%d" % SECINFO_DACL]) for msg in res: existing_sd = ndr_unpack(security.descriptor, msg["nTSecurityDescriptor"][0]) existing_sddl = existing_sd.as_sddl(self.domain_sid) self.insert_ace_into_dacl(msg.dn, existing_sddl, ace) if self.add_update_container: self.update_add(op) # Update display specifiers def operation_90(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) # Update display specifiers def operation_127(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) # Update appears to already be applied in documentation def operation_128(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) # Grant ACE (OA;CIOI;RPWP;3f78c3e5-f79a-46bd-a0b8-9d18116ddc79;;PS) to samDomain def operation_129(self, op): if self.update_exists(op): return self.raise_if_not_fix(op) ace = "(OA;CIOI;RPWP;3f78c3e5-f79a-46bd-a0b8-9d18116ddc79;;PS)" schema_dn = ldb.Dn(self.samdb, "CN=Sam-Domain,%s" % str(self.schema_dn)) self.insert_ace_into_string(schema_dn, ace, attr='defaultSecurityDescriptor') res = self.samdb.search(expression="(objectClass=samDomain)", attrs=["nTSecurityDescriptor"], controls=["search_options:1:2"]) for msg in res: existing_sd = ndr_unpack(security.descriptor, msg["nTSecurityDescriptor"][0]) existing_sddl = existing_sd.as_sddl(self.domain_sid) self.insert_ace_into_dacl(msg.dn, existing_sddl, ace) if self.add_update_container: self.update_add(op) # Grant ACE (OA;CIOI;RPWP;3f78c3e5-f79a-46bd-a0b8-9d18116ddc79;;PS) to domainDNS def operation_130(self, op): if self.update_exists(op): return self.raise_if_not_fix(op) ace = "(OA;CIOI;RPWP;3f78c3e5-f79a-46bd-a0b8-9d18116ddc79;;PS)" schema_dn = ldb.Dn(self.samdb, "CN=Domain-DNS,%s" % str(self.schema_dn)) self.insert_ace_into_string(schema_dn, ace, attr='defaultSecurityDescriptor') res = self.samdb.search(expression="(objectClass=domainDNS)", attrs=["nTSecurityDescriptor"], controls=["search_options:1:2"]) for msg in res: existing_sd = ndr_unpack(security.descriptor, msg["nTSecurityDescriptor"][0]) existing_sddl = existing_sd.as_sddl(self.domain_sid) self.insert_ace_into_dacl(msg.dn, existing_sddl, ace) if self.add_update_container: self.update_add(op) # Set msDS-ClaimIsValueSpaceRestricted on ad://ext/AuthenticationSilo to FALSE def operation_135(self, op): if self.update_exists(op): return self.raise_if_not_fix(op) self.samdb.modify_ldif("""dn: CN=ad://ext/AuthenticationSilo,CN=Claim Types,CN=Claims Configuration,CN=Services,%s changetype: modify replace: msDS-ClaimIsValueSpaceRestricted msDS-ClaimIsValueSpaceRestricted: FALSE """ % self.config_dn, controls=["relax:0", "provision:0"]) if self.add_update_container: self.update_add(op) # # THE FOLLOWING ARE MISSING UPDATES FROM 2008 + 2008 R2 # def operation_53(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) def operation_79(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) def operation_80(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) def operation_81(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) def operation_82(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op) def operation_83(self, op): if self.add_update_container and not self.update_exists(op): self.update_add(op)