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samba-mirror/python/samba/domain_update.py
Andrew Bartlett 2854ef29b8 provision: Match Windows 2022 and set msDS-ExpirePasswordsOnSmartCardOnlyAccounts by default 
We do this by telling the Domain Functional Level upgrade code that
this is a new install.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Jo Sutton <josutton@catalyst.net.nz>
2024-06-10 04:27:31 +00:00

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# Samba4 Domain update checker
#
# Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 <http://www.gnu.org/licenses/>.
#
import ldb
from base64 import b64encode
from samba import sd_utils
from samba.dcerpc import security
from samba.descriptor import (
get_managed_service_accounts_descriptor,
)
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 = 75
MAX_UPDATE = 89
update_map = {
# Missing updates from 2008 R2 - version 5
75: "5e1574f6-55df-493e-a671-aaeffca6a100",
76: "d262aae8-41f7-48ed-9f35-56bbb677573d",
77: "82112ba0-7e4c-4a44-89d9-d46c9612bf91",
# Windows Server 2012 - version 9
78: "c3c927a6-cc1d-47c0-966b-be8f9b63d991",
79: "54afcfb9-637a-4251-9f47-4d50e7021211",
80: "f4728883-84dd-483c-9897-274f2ebcf11e",
81: "ff4f9d27-7157-4cb0-80a9-5d6f2b14c8ff",
# Windows Server 2012 R2 - version 10
# No updates
# Windows Server 2016 - version 15
82: "83c53da7-427e-47a4-a07a-a324598b88f7",
# from the documentation and a fresh installation
# 83 is this:
# c81fc9cc-0130-4fd1-b272-634d74818133
# adprep will use this on the wire:
# c81fc9cc-0130-f4d1-b272-634d74818133
83: "c81fc9cc-0130-4fd1-b272-634d74818133",
84: "e5f9e791-d96d-4fc9-93c9-d53e1dc439ba",
85: "e6d5fd00-385d-4e65-b02d-9da3493ed850",
86: "3a6b3fbf-3168-4312-a10d-dd5b3393952d",
87: "7f950403-0ab3-47f9-9730-5d7b0269f9bd",
88: "434bb40d-dbc9-4fe7-81d4-d57229f7b080",
# Windows Server 2016 - version 16
89: "a0c238ba-9e30-4ee6-80a6-43f731e9a5cd",
}
functional_level_to_max_update = {
DS_DOMAIN_FUNCTION_2008: 74,
DS_DOMAIN_FUNCTION_2008_R2: 77,
DS_DOMAIN_FUNCTION_2012: 81,
DS_DOMAIN_FUNCTION_2012_R2: 81,
DS_DOMAIN_FUNCTION_2016: 89,
}
functional_level_to_version = {
DS_DOMAIN_FUNCTION_2008: 3,
DS_DOMAIN_FUNCTION_2008_R2: 5,
DS_DOMAIN_FUNCTION_2012: 9,
DS_DOMAIN_FUNCTION_2012_R2: 10,
DS_DOMAIN_FUNCTION_2016: 16,
}
# No update numbers have been skipped over
missing_updates = []
class DomainUpdateException(Exception):
pass
class DomainUpdate(object):
"""Check and update a SAM database for domain updates"""
def __init__(self, samdb, fix=False,
new_install=False,
add_update_container=True):
"""
:param samdb: LDB database
:param fix: Apply the update if the container is missing
:param new_install: Apply the update as per a new install (see op 88)
:param add_update_container: Add the container at the end of the change
:raise DomainUpdateException:
"""
self.samdb = samdb
self.fix = fix
self.new_install = new_install
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.domainupdate_container = self.samdb.get_root_basedn()
try:
self.domainupdate_container.add_child("CN=Operations,CN=DomainUpdates,CN=System")
except ldb.LdbError:
raise DomainUpdateException("Failed to add domain update container child")
self.revision_object = self.samdb.get_root_basedn()
try:
self.revision_object.add_child("CN=ActiveDirectoryUpdate,CN=DomainUpdates,CN=System")
except ldb.LdbError:
raise DomainUpdateException("Failed to add revision object child")
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 DomainUpdateException:
"""
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 DomainUpdateException("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 DomainUpdateException:
"""
for op in iterator:
if op < MIN_UPDATE or op > MAX_UPDATE:
raise DomainUpdateException("Update number invalid.")
# 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 DomainUpdateException:
"""
op = start
if start < MIN_UPDATE or start > end or end > MAX_UPDATE:
raise DomainUpdateException("Update number invalid.")
while op <= end:
if op not in missing_updates:
# 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
"""
update_dn = "CN=%s,%s" % (update_map[op], self.domainupdate_container)
try:
res = self.samdb.search(base=update_dn,
scope=ldb.SCOPE_BASE,
attrs=[])
except ldb.LdbError as e:
(num, msg) = e.args
if num != ldb.ERR_NO_SUCH_OBJECT:
raise
return False
assert len(res) == 1
print("Skip Domain Update %u: %s" % (op, update_map[op]))
return True
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.domainupdate_container)))
print("Applied Domain Update %u: %s" % (op, update_map[op]))
def raise_if_not_fix(self, op):
"""
Raises an exception if not set to fix.
:param op: Integer operation
:raise DomainUpdateException:
"""
if not self.fix:
raise DomainUpdateException("Missing operation %d. Fix is currently set to False" % op)
# Create a new object CN=TPM Devices in the Domain partition.
def operation_78(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
self.samdb.add_ldif("""dn: CN=TPM Devices,%s
objectClass: top
objectClass: msTPM-InformationObjectsContainer
""" % self.domain_dn,
controls=["relax:0", "provision:0"])
if self.add_update_container:
self.update_add(op)
# Created an access control entry for the TPM service.
def operation_79(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)"
self.sd_utils.update_aces_in_dacl(self.domain_dn, add_aces=[ace])
if self.add_update_container:
self.update_add(op)
# Grant "Clone DC" extended right to Cloneable Domain Controllers group
def operation_80(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
ace = "(OA;;CR;3e0f7e18-2c7a-4c10-ba82-4d926db99a3e;;CN)"
self.sd_utils.update_aces_in_dacl(self.domain_dn, add_aces=[ace])
if self.add_update_container:
self.update_add(op)
# Grant ms-DS-Allowed-To-Act-On-Behalf-Of-Other-Identity to Principal Self
# on all objects
def operation_81(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
ace = "(OA;CIOI;RPWP;3f78c3e5-f79a-46bd-a0b8-9d18116ddc79;;PS)"
self.sd_utils.update_aces_in_dacl(self.domain_dn, add_aces=[ace])
if self.add_update_container:
self.update_add(op)
#
# THE FOLLOWING ARE MISSING UPDATES FROM 2008 R2
#
# Add Managed Service Accounts container
def operation_75(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
descriptor = get_managed_service_accounts_descriptor(self.domain_sid)
managedservice_descr = b64encode(descriptor).decode('utf8')
managed_service_dn = "CN=Managed Service Accounts,%s" % \
str(self.domain_dn)
self.samdb.modify_ldif("""dn: %s
changetype: add
objectClass: container
description: Default container for managed service accounts
showInAdvancedViewOnly: FALSE
nTSecurityDescriptor:: %s""" % (managed_service_dn, managedservice_descr),
controls=["relax:0", "provision:0"])
if self.add_update_container:
self.update_add(op)
# Add the otherWellKnownObjects reference to MSA
def operation_76(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
managed_service_dn = "CN=Managed Service Accounts,%s" % \
str(self.domain_dn)
self.samdb.modify_ldif("""dn: %s
changetype: modify
add: otherWellKnownObjects
otherWellKnownObjects: B:32:1EB93889E40C45DF9F0C64D23BBB6237:%s
""" % (str(self.domain_dn), managed_service_dn), controls=["relax:0",
"provision:0"])
if self.add_update_container:
self.update_add(op)
# Add the PSPs object in the System container
def operation_77(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
self.samdb.add_ldif("""dn: CN=PSPs,CN=System,%s
objectClass: top
objectClass: msImaging-PSPs
""" % str(self.domain_dn), controls=["relax:0", "provision:0"])
if self.add_update_container:
self.update_add(op)
## ## Windows Server 2016: Domain-wide updates
##
## After the operations that are performed by domainprep in Windows
## Server 2016 (operations 82-88) complete, the revision attribute for the
## CN=ActiveDirectoryUpdate,CN=DomainUpdates,CN=System,DC=ForestRootDomain
## object is set to 15.
## Operation 82: {83c53da7-427e-47a4-a07a-a324598b88f7}
##
## Create CN=Keys container at root of domain
##
## - objectClass: container
## - description: Default container for key credential objects
## - ShowInAdvancedViewOnly: TRUE
##
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;EA)
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;DA)
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;SY)
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;DD)
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;ED)
##
def operation_82(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
keys_dn = "CN=Keys,%s" % str(self.domain_dn)
sddl = "O:DA"
sddl += "D:"
sddl += "(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;EA)"
sddl += "(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;DA)"
sddl += "(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;SY)"
sddl += "(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;DD)"
sddl += "(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;ED)"
ldif = """
dn: %s
objectClass: container
description: Default container for key credential objects
ShowInAdvancedViewOnly: TRUE
nTSecurityDescriptor: %s
""" % (keys_dn, sddl)
self.samdb.add_ldif(ldif)
if self.add_update_container:
self.update_add(op)
## Operation 83: {c81fc9cc-0130-4fd1-b272-634d74818133}
##
## Add Full Control allow aces to CN=Keys container for "domain\Key Admins"
## and "rootdomain\Enterprise Key Admins".
##
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;Key Admins)
## (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;Enterprise Key Admins)
##
def operation_83(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
keys_dn = "CN=Keys,%s" % str(self.domain_dn)
aces = ["(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;KA)"]
aces += ["(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;EK)"]
self.sd_utils.update_aces_in_dacl(keys_dn, add_aces=aces)
if self.add_update_container:
self.update_add(op)
## Operation 84: {e5f9e791-d96d-4fc9-93c9-d53e1dc439ba}
##
## Modify otherWellKnownObjects attribute to point to the CN=Keys container.
##
## - otherWellKnownObjects: B:32:683A24E2E8164BD3AF86AC3C2CF3F981:CN=Keys,%ws
def operation_84(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
keys_dn = "CN=Keys,%s" % str(self.domain_dn)
ldif = """
dn: %s
changetype: modify
add: otherWellKnownObjects
otherWellKnownObjects: B:32:683A24E2E8164BD3AF86AC3C2CF3F981:%s
""" % (str(self.domain_dn), keys_dn)
self.samdb.modify_ldif(ldif)
if self.add_update_container:
self.update_add(op)
## Operation 85: {e6d5fd00-385d-4e65-b02d-9da3493ed850}
##
## Modify the domain NC to permit "domain\Key Admins" and
## "rootdomain\Enterprise Key Admins"
## to modify the msds-KeyCredentialLink attribute.
##
## (OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;Key Admins)
## (OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;Enterprise Key Admins)
## in root domain, but in non-root domains resulted in a bogus domain-relative
## ACE with a non-resolvable -527 SID
##
def operation_85(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
aces = ["(OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;KA)"]
# we use an explicit sid in order to replay the windows mistake
aces += ["(OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;%s-527)" %
str(self.domain_sid)]
self.sd_utils.update_aces_in_dacl(self.domain_dn, add_aces=aces)
if self.add_update_container:
self.update_add(op)
## Operation 86: {3a6b3fbf-3168-4312-a10d-dd5b3393952d}
##
## Grant the DS-Validated-Write-Computer CAR to creator owner and self
##
## (OA;CIIO;SW;9b026da6-0d3c-465c-8bee-5199d7165cba;bf967a86-0de6-11d0-a285-00aa003049e2;PS)
## (OA;CIIO;SW;9b026da6-0d3c-465c-8bee-5199d7165cba;bf967a86-0de6-11d0-a285-00aa003049e2;CO)
##
def operation_86(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
aces = ["(OA;CIIO;SW;9b026da6-0d3c-465c-8bee-5199d7165cba;bf967a86-0de6-11d0-a285-00aa003049e2;PS)"]
aces += ["(OA;CIIO;SW;9b026da6-0d3c-465c-8bee-5199d7165cba;bf967a86-0de6-11d0-a285-00aa003049e2;CO)"]
self.sd_utils.update_aces_in_dacl(self.domain_dn, add_aces=aces)
if self.add_update_container:
self.update_add(op)
## Operation 87: {7f950403-0ab3-47f9-9730-5d7b0269f9bd}
##
## Delete the ACE granting Full Control to the incorrect
## domain-relative Enterprise Key Admins group, and add
## an ACE granting Full Control to Enterprise Key Admins group.
##
## Delete (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;Enterprise Key Admins)
## Add (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;Enterprise Key Admins)
##
def operation_87(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
# we use an explicit sid in order to replay the windows mistake
# note this is also strange for a 2nd reason because it doesn't
# delete: ["(OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;%s-527)"
# which was added in operation_85, so the del is basically a noop
# and the result is one additional ace
del_aces = ["(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;%s-527)" %
str(self.domain_sid)]
add_aces = ["(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;EK)"]
self.sd_utils.update_aces_in_dacl(self.domain_dn,
del_aces=del_aces,
add_aces=add_aces)
if self.add_update_container:
self.update_add(op)
## Operation 88: {434bb40d-dbc9-4fe7-81d4-d57229f7b080}
##
## Add "msDS-ExpirePasswordsOnSmartCardOnlyAccounts" on the domain NC object
## and set default value to FALSE (upgrades) or TRUE (new installs)
##
## See
## https://learn.microsoft.com/en-us/windows-server/get-started/whats-new-in-windows-server-2016#rolling-public-key-only-users-ntlm-secrets
## for justification of the observed behaviour that new installs
## have this set to TRUE
##
def operation_88(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
if self.new_install:
expire_value = "TRUE"
else:
expire_value = "FALSE"
ldif = f"""
dn: {self.domain_dn}
changetype: modify
add: msDS-ExpirePasswordsOnSmartCardOnlyAccounts
msDS-ExpirePasswordsOnSmartCardOnlyAccounts: {expire_value}
"""
self.samdb.modify_ldif(ldif)
if self.add_update_container:
self.update_add(op)
## Windows Server 2016 (operation 89) complete, the **revision** attribute for the
## CN=ActiveDirectoryUpdate,CN=DomainUpdates,CN=System,DC=ForestRootDomain object
## is set to **16**.
##
## Operation 89: {a0c238ba-9e30-4ee6-80a6-43f731e9a5cd}
##
## Delete the ACE granting Full Control to Enterprise Key Admins and
## add an ACE granting Enterprise Key Admins Full Control over just
## the msdsKeyCredentialLink attribute.
##
## Delete (A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;Enterprise Key Admins)
## Add (OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;Enterprise Key Admins)|
##
def operation_89(self, op):
if self.update_exists(op):
return
self.raise_if_not_fix(op)
# Note this only fixes the mistake from operation_87
# but leaves the mistake of operation_85 if we're
# not in the root domain...
del_aces = ["(A;CI;RPWPCRLCLOCCDCRCWDWOSDDTSW;;;EK)"]
add_aces = ["(OA;CI;RPWP;5b47d60f-6090-40b2-9f37-2a4de88f3063;;EK)"]
self.sd_utils.update_aces_in_dacl(self.domain_dn,
del_aces=del_aces,
add_aces=add_aces)
if self.add_update_container:
self.update_add(op)
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