# Unix SMB/CIFS implementation.
# Copyright (C) Stefan Metzmacher 2020
# Copyright (C) 2020-2021 Catalyst.Net Ltd
#
# 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 sys
import os
sys.path.insert(0, "bin/python")
os.environ["PYTHONUNBUFFERED"] = "1"
from datetime import datetime, timezone
from functools import partial
import tempfile
import binascii
import collections
import numbers
import secrets
from enum import Enum
from collections import namedtuple
import ldb
from ldb import SCOPE_BASE
from samba import (
NTSTATUSError,
arcfour_encrypt,
common,
generate_random_password,
ntstatus,
)
from samba.auth import system_session
from samba.credentials import (
Credentials,
SPECIFIED,
DONT_USE_KERBEROS,
MUST_USE_KERBEROS,
)
from samba.crypto import des_crypt_blob_16, md4_hash_blob
from samba.dcerpc import (
claims,
drsblobs,
drsuapi,
krb5ccache,
krb5pac,
lsa,
misc,
netlogon,
ntlmssp,
samr,
security,
)
from samba.drs_utils import drs_Replicate, drsuapi_connect
from samba.dsdb import (
DSDB_SYNTAX_BINARY_DN,
DS_DOMAIN_FUNCTION_2000,
DS_DOMAIN_FUNCTION_2008,
DS_GUID_COMPUTERS_CONTAINER,
DS_GUID_DOMAIN_CONTROLLERS_CONTAINER,
DS_GUID_MANAGED_SERVICE_ACCOUNTS_CONTAINER,
DS_GUID_USERS_CONTAINER,
GTYPE_SECURITY_DOMAIN_LOCAL_GROUP,
GTYPE_SECURITY_GLOBAL_GROUP,
GTYPE_SECURITY_UNIVERSAL_GROUP,
UF_WORKSTATION_TRUST_ACCOUNT,
UF_NO_AUTH_DATA_REQUIRED,
UF_NORMAL_ACCOUNT,
UF_NOT_DELEGATED,
UF_PARTIAL_SECRETS_ACCOUNT,
UF_SERVER_TRUST_ACCOUNT,
UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
)
from samba.dcerpc.misc import (
SEC_CHAN_NULL,
SEC_CHAN_WKSTA,
SEC_CHAN_BDC,
)
from samba.join import DCJoinContext
from samba.ndr import ndr_pack, ndr_unpack
from samba import net
from samba.netcmd.domain.models import AuthenticationPolicy, AuthenticationSilo
from samba.samdb import SamDB, dsdb_Dn
rc4_bit = security.KERB_ENCTYPE_RC4_HMAC_MD5
aes256_sk_bit = security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK
from samba.tests import TestCaseInTempDir, delete_force
import samba.tests.krb5.kcrypto as kcrypto
from samba.tests.krb5.raw_testcase import (
KerberosCredentials,
KerberosTicketCreds,
RawKerberosTest
)
import samba.tests.krb5.rfc4120_pyasn1 as krb5_asn1
from samba.tests.krb5.rfc4120_constants import (
AD_IF_RELEVANT,
AD_WIN2K_PAC,
AES256_CTS_HMAC_SHA1_96,
ARCFOUR_HMAC_MD5,
KDC_ERR_PREAUTH_REQUIRED,
KDC_ERR_TGT_REVOKED,
KRB_AS_REP,
KRB_TGS_REP,
KRB_ERROR,
KU_AS_REP_ENC_PART,
KU_ENC_CHALLENGE_CLIENT,
KU_PA_ENC_TIMESTAMP,
KU_TICKET,
NT_PRINCIPAL,
NT_SRV_INST,
PADATA_ENCRYPTED_CHALLENGE,
PADATA_ENC_TIMESTAMP,
PADATA_ETYPE_INFO2,
)
global_asn1_print = False
global_hexdump = False
class GroupType(Enum):
GLOBAL = GTYPE_SECURITY_GLOBAL_GROUP
DOMAIN_LOCAL = GTYPE_SECURITY_DOMAIN_LOCAL_GROUP
UNIVERSAL = GTYPE_SECURITY_UNIVERSAL_GROUP
# This simple class encapsulates the DN and SID of a Principal.
class Principal:
def __init__(self, dn, sid):
if dn is not None and not isinstance(dn, ldb.Dn):
raise AssertionError(f'expected {dn} to be an ldb.Dn')
self.dn = dn
self.sid = sid
class KDCBaseTest(TestCaseInTempDir, RawKerberosTest):
""" Base class for KDC tests.
"""
class AccountType(Enum):
USER = object()
COMPUTER = object()
SERVER = object()
RODC = object()
MANAGED_SERVICE = object()
@classmethod
def setUpClass(cls):
super().setUpClass()
cls._lp = None
cls._ldb = None
cls._rodc_ldb = None
cls._drsuapi_connection = None
cls._functional_level = None
# An identifier to ensure created accounts have unique names. Windows
# caches accounts based on usernames, so account names being different
# across test runs avoids previous test runs affecting the results.
cls.account_base = f'{secrets.token_hex(4)}_'
cls.account_id = 0
# A list containing DNs of accounts created as part of testing.
cls.accounts = []
cls.account_cache = {}
cls.policy_cache = {}
cls.tkt_cache = {}
cls._rodc_ctx = None
cls.ldb_cleanups = []
cls._claim_types_dn = None
cls._authn_policy_config_dn = None
cls._authn_policies_dn = None
cls._authn_silos_dn = None
def get_claim_types_dn(self):
samdb = self.get_samdb()
if self._claim_types_dn is None:
claim_config_dn = samdb.get_config_basedn()
claim_config_dn.add_child('CN=Claims Configuration,CN=Services')
details = {
'dn': claim_config_dn,
'objectClass': 'container',
}
try:
samdb.add(details)
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_ENTRY_ALREADY_EXISTS:
raise
else:
self.accounts.append(str(claim_config_dn))
claim_types_dn = claim_config_dn
claim_types_dn.add_child('CN=Claim Types')
details = {
'dn': claim_types_dn,
'objectClass': 'msDS-ClaimTypes',
}
try:
samdb.add(details)
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_ENTRY_ALREADY_EXISTS:
raise
else:
self.accounts.append(str(claim_types_dn))
type(self)._claim_types_dn = claim_types_dn
# Return a copy of the DN.
return ldb.Dn(samdb, str(self._claim_types_dn))
def get_authn_policy_config_dn(self):
samdb = self.get_samdb()
if self._authn_policy_config_dn is None:
authn_policy_config_dn = samdb.get_config_basedn()
authn_policy_config_dn.add_child(
'CN=AuthN Policy Configuration,CN=Services')
details = {
'dn': authn_policy_config_dn,
'objectClass': 'container',
'description': ('Contains configuration for authentication '
'policy'),
}
try:
samdb.add(details)
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_ENTRY_ALREADY_EXISTS:
raise
else:
self.accounts.append(str(authn_policy_config_dn))
type(self)._authn_policy_config_dn = authn_policy_config_dn
# Return a copy of the DN.
return ldb.Dn(samdb, str(self._authn_policy_config_dn))
def get_authn_policies_dn(self):
samdb = self.get_samdb()
if self._authn_policies_dn is None:
authn_policies_dn = self.get_authn_policy_config_dn()
authn_policies_dn.add_child('CN=AuthN Policies')
details = {
'dn': authn_policies_dn,
'objectClass': 'msDS-AuthNPolicies',
'description': 'Contains authentication policy objects',
}
try:
samdb.add(details)
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_ENTRY_ALREADY_EXISTS:
raise
else:
self.accounts.append(str(authn_policies_dn))
type(self)._authn_policies_dn = authn_policies_dn
# Return a copy of the DN.
return ldb.Dn(samdb, str(self._authn_policies_dn))
def get_authn_silos_dn(self):
samdb = self.get_samdb()
if self._authn_silos_dn is None:
authn_silos_dn = self.get_authn_policy_config_dn()
authn_silos_dn.add_child('CN=AuthN Silos')
details = {
'dn': authn_silos_dn,
'objectClass': 'msDS-AuthNPolicySilos',
'description': 'Contains authentication policy silo objects',
}
try:
samdb.add(details)
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_ENTRY_ALREADY_EXISTS:
raise
else:
self.accounts.append(str(authn_silos_dn))
type(self)._authn_silos_dn = authn_silos_dn
# Return a copy of the DN.
return ldb.Dn(samdb, str(self._authn_silos_dn))
@staticmethod
def freeze(m):
return frozenset((k, v) for k, v in m.items())
def tearDown(self):
# Run any cleanups that may modify accounts prior to deleting those
# accounts.
self.doCleanups()
# Clean up any accounts created for single tests.
if self._ldb is not None:
for dn in reversed(self.test_accounts):
delete_force(self._ldb, dn)
super().tearDown()
@classmethod
def tearDownClass(cls):
# Clean up any accounts created by create_account. This is
# done in tearDownClass() rather than tearDown(), so that
# accounts need only be created once for permutation tests.
if cls._ldb is not None:
for cleanup in reversed(cls.ldb_cleanups):
try:
cls._ldb.modify(cleanup)
except ldb.LdbError:
pass
for dn in reversed(cls.accounts):
delete_force(cls._ldb, dn)
if cls._rodc_ctx is not None:
cls._rodc_ctx.cleanup_old_join(force=True)
super().tearDownClass()
def setUp(self):
super().setUp()
self.do_asn1_print = global_asn1_print
self.do_hexdump = global_hexdump
# A list containing DNs of accounts that should be removed when the
# current test finishes.
self.test_accounts = []
def get_lp(self):
if self._lp is None:
type(self)._lp = self.get_loadparm()
return self._lp
def get_samdb(self):
if self._ldb is None:
creds = self.get_admin_creds()
lp = self.get_lp()
session = system_session()
type(self)._ldb = SamDB(url="ldap://%s" % self.dc_host,
session_info=session,
credentials=creds,
lp=lp)
return self._ldb
def get_rodc_samdb(self):
if self._rodc_ldb is None:
creds = self.get_admin_creds()
lp = self.get_lp()
session = system_session()
type(self)._rodc_ldb = SamDB(url="ldap://%s" % self.host,
session_info=session,
credentials=creds,
lp=lp,
am_rodc=True)
return self._rodc_ldb
def get_drsuapi_connection(self):
if self._drsuapi_connection is None:
admin_creds = self.get_admin_creds()
samdb = self.get_samdb()
dns_hostname = samdb.host_dns_name()
type(self)._drsuapi_connection = drsuapi_connect(dns_hostname,
self.get_lp(),
admin_creds,
ip=self.dc_host)
return self._drsuapi_connection
def get_server_dn(self, samdb):
server = samdb.get_serverName()
res = samdb.search(base=server,
scope=ldb.SCOPE_BASE,
attrs=['serverReference'])
dn = ldb.Dn(samdb, res[0]['serverReference'][0].decode('utf8'))
return dn
def get_mock_rodc_ctx(self):
if self._rodc_ctx is None:
admin_creds = self.get_admin_creds()
lp = self.get_lp()
rodc_name = self.get_new_username()
site_name = 'Default-First-Site-Name'
rodc_ctx = DCJoinContext(server=self.dc_host,
creds=admin_creds,
lp=lp,
site=site_name,
netbios_name=rodc_name,
targetdir=None,
domain=None)
self.create_rodc(rodc_ctx)
type(self)._rodc_ctx = rodc_ctx
return self._rodc_ctx
def get_domain_functional_level(self, ldb=None):
if self._functional_level is None:
if ldb is None:
ldb = self.get_samdb()
res = ldb.search(base='',
scope=SCOPE_BASE,
attrs=['domainFunctionality'])
try:
functional_level = int(res[0]['domainFunctionality'][0])
except KeyError:
functional_level = DS_DOMAIN_FUNCTION_2000
type(self)._functional_level = functional_level
return self._functional_level
def get_default_enctypes(self, creds):
self.assertIsNotNone(creds, 'expected client creds to be passed in')
functional_level = self.get_domain_functional_level()
default_enctypes = []
if functional_level >= DS_DOMAIN_FUNCTION_2008:
# AES is only supported at functional level 2008 or higher
default_enctypes.append(kcrypto.Enctype.AES256)
default_enctypes.append(kcrypto.Enctype.AES128)
if self.expect_nt_hash or creds.get_workstation():
default_enctypes.append(kcrypto.Enctype.RC4)
return default_enctypes
def create_group(self, samdb, name, ou=None, gtype=None):
if ou is None:
ou = samdb.get_wellknown_dn(samdb.get_default_basedn(),
DS_GUID_USERS_CONTAINER)
dn = f'CN={name},{ou}'
# Remove the group if it exists; this will happen if a previous test
# run failed.
delete_force(samdb, dn)
# Save the group name so it can be deleted in tearDownClass.
self.accounts.append(dn)
details = {
'dn': dn,
'objectClass': 'group'
}
if gtype is not None:
details['groupType'] = common.normalise_int32(gtype)
samdb.add(details)
return dn
def get_dn_from_attribute(self, attribute):
return self.get_from_attribute(attribute).dn
def get_dn_from_class(self, attribute):
return self.get_from_class(attribute).dn
def get_schema_id_guid_from_attribute(self, attribute):
guid = self.get_from_attribute(attribute).get('schemaIDGUID', idx=0)
return misc.GUID(guid)
def get_from_attribute(self, attribute):
return self.get_from_schema(attribute, 'attributeSchema')
def get_from_class(self, attribute):
return self.get_from_schema(attribute, 'classSchema')
def get_from_schema(self, name, object_class):
samdb = self.get_samdb()
schema_dn = samdb.get_schema_basedn()
res = samdb.search(base=schema_dn,
scope=ldb.SCOPE_ONELEVEL,
attrs=['schemaIDGUID'],
expression=(f'(&(objectClass={object_class})'
f'(lDAPDisplayName={name}))'))
self.assertEqual(1, len(res),
f'could not locate {name} in {object_class}')
return res[0]
def create_authn_silo(self, *,
members=None,
user_policy=None,
computer_policy=None,
service_policy=None,
enforced=None):
samdb = self.get_samdb()
silo_id = self.get_new_username()
authn_silo_dn = self.get_authn_silos_dn()
authn_silo_dn.add_child(f'CN={silo_id}')
details = {
'dn': authn_silo_dn,
'objectClass': 'msDS-AuthNPolicySilo',
}
if enforced is True:
enforced = 'TRUE'
elif enforced is False:
enforced = 'FALSE'
if members is not None:
details['msDS-AuthNPolicySiloMembers'] = members
if user_policy is not None:
details['msDS-UserAuthNPolicy'] = str(user_policy.dn)
if computer_policy is not None:
details['msDS-ComputerAuthNPolicy'] = str(computer_policy.dn)
if service_policy is not None:
details['msDS-ServiceAuthNPolicy'] = str(service_policy.dn)
if enforced is not None:
details['msDS-AuthNPolicySiloEnforced'] = enforced
# Save the silo DN so it can be deleted in tearDownClass().
self.accounts.append(str(authn_silo_dn))
# Remove the silo if it exists; this will happen if a previous test run
# failed.
delete_force(samdb, authn_silo_dn)
samdb.add(details)
return AuthenticationSilo.get(samdb, dn=authn_silo_dn)
def create_authn_silo_claim_id(self):
claim_id = 'ad://ext/AuthenticationSilo'
for_classes = [
'msDS-GroupManagedServiceAccount',
'user',
'msDS-ManagedServiceAccount',
'computer',
]
self.create_claim(claim_id,
enabled=True,
single_valued=True,
value_space_restricted=False,
source_type='Constructed',
for_classes=for_classes,
value_type=claims.CLAIM_TYPE_STRING,
# It's OK if the claim type already exists.
force=False)
return claim_id
def create_authn_policy(self, *,
use_cache=True,
**kwargs):
if use_cache:
cache_key = self.freeze(kwargs)
authn_policy = self.policy_cache.get(cache_key)
if authn_policy is not None:
return authn_policy
authn_policy = self.create_authn_policy_opts(**kwargs)
if use_cache:
self.policy_cache[cache_key] = authn_policy
return authn_policy
def create_authn_policy_opts(self, *,
enforced=None,
strong_ntlm_policy=None,
user_allowed_from=None,
user_allowed_ntlm=None,
user_allowed_to=None,
user_tgt_lifetime=None,
computer_allowed_to=None,
computer_tgt_lifetime=None,
service_allowed_from=None,
service_allowed_ntlm=None,
service_allowed_to=None,
service_tgt_lifetime=None):
samdb = self.get_samdb()
policy_id = self.get_new_username()
policy_dn = self.get_authn_policies_dn()
policy_dn.add_child(f'CN={policy_id}')
details = {
'dn': policy_dn,
'objectClass': 'msDS-AuthNPolicy',
}
_domain_sid = None
def sd_from_sddl(sddl):
nonlocal _domain_sid
if _domain_sid is None:
_domain_sid = security.dom_sid(samdb.get_domain_sid())
return ndr_pack(security.descriptor.from_sddl(sddl, _domain_sid))
if enforced is True:
enforced = 'TRUE'
elif enforced is False:
enforced = 'FALSE'
if user_allowed_ntlm is True:
user_allowed_ntlm = 'TRUE'
elif user_allowed_ntlm is False:
user_allowed_ntlm = 'FALSE'
if service_allowed_ntlm is True:
service_allowed_ntlm = 'TRUE'
elif service_allowed_ntlm is False:
service_allowed_ntlm = 'FALSE'
if enforced is not None:
details['msDS-AuthNPolicyEnforced'] = enforced
if strong_ntlm_policy is not None:
details['msDS-StrongNTLMPolicy'] = strong_ntlm_policy
if user_allowed_from is not None:
details['msDS-UserAllowedToAuthenticateFrom'] = sd_from_sddl(
user_allowed_from)
if user_allowed_ntlm is not None:
details['msDS-UserAllowedNTLMNetworkAuthentication'] = (
user_allowed_ntlm)
if user_allowed_to is not None:
details['msDS-UserAllowedToAuthenticateTo'] = sd_from_sddl(
user_allowed_to)
if user_tgt_lifetime is not None:
if isinstance(user_tgt_lifetime, numbers.Number):
user_tgt_lifetime = str(int(user_tgt_lifetime * 10_000_000))
details['msDS-UserTGTLifetime'] = user_tgt_lifetime
if computer_allowed_to is not None:
details['msDS-ComputerAllowedToAuthenticateTo'] = sd_from_sddl(
computer_allowed_to)
if computer_tgt_lifetime is not None:
if isinstance(computer_tgt_lifetime, numbers.Number):
computer_tgt_lifetime = str(
int(computer_tgt_lifetime * 10_000_000))
details['msDS-ComputerTGTLifetime'] = computer_tgt_lifetime
if service_allowed_from is not None:
details['msDS-ServiceAllowedToAuthenticateFrom'] = sd_from_sddl(
service_allowed_from)
if service_allowed_ntlm is not None:
details['msDS-ServiceAllowedNTLMNetworkAuthentication'] = (
service_allowed_ntlm)
if service_allowed_to is not None:
details['msDS-ServiceAllowedToAuthenticateTo'] = sd_from_sddl(
service_allowed_to)
if service_tgt_lifetime is not None:
if isinstance(service_tgt_lifetime, numbers.Number):
service_tgt_lifetime = str(
int(service_tgt_lifetime * 10_000_000))
details['msDS-ServiceTGTLifetime'] = service_tgt_lifetime
# Save the policy DN so it can be deleted in tearDownClass().
self.accounts.append(str(policy_dn))
# Remove the policy if it exists; this will happen if a previous test
# run failed.
delete_force(samdb, policy_dn)
samdb.add(details)
return AuthenticationPolicy.get(samdb, dn=policy_dn)
def create_claim(self,
claim_id,
enabled=None,
attribute=None,
single_valued=None,
value_space_restricted=None,
source=None,
source_type=None,
for_classes=None,
value_type=None,
force=True):
samdb = self.get_samdb()
claim_dn = self.get_claim_types_dn()
claim_dn.add_child(f'CN={claim_id}')
details = {
'dn': claim_dn,
'objectClass': 'msDS-ClaimType',
}
if enabled is True:
enabled = 'TRUE'
elif enabled is False:
enabled = 'FALSE'
if attribute is not None:
attribute = str(self.get_dn_from_attribute(attribute))
if single_valued is True:
single_valued = 'TRUE'
elif single_valued is False:
single_valued = 'FALSE'
if value_space_restricted is True:
value_space_restricted = 'TRUE'
elif value_space_restricted is False:
value_space_restricted = 'FALSE'
if for_classes is not None:
for_classes = [str(self.get_dn_from_class(name))
for name in for_classes]
if isinstance(value_type, int):
value_type = str(value_type)
if enabled is not None:
details['Enabled'] = enabled
if attribute is not None:
details['msDS-ClaimAttributeSource'] = attribute
if single_valued is not None:
details['msDS-ClaimIsSingleValued'] = single_valued
if value_space_restricted is not None:
details['msDS-ClaimIsValueSpaceRestricted'] = (
value_space_restricted)
if source is not None:
details['msDS-ClaimSource'] = source
if source_type is not None:
details['msDS-ClaimSourceType'] = source_type
if for_classes is not None:
details['msDS-ClaimTypeAppliesToClass'] = for_classes
if value_type is not None:
details['msDS-ClaimValueType'] = value_type
if force:
# Remove the claim if it exists; this will happen if a previous
# test run failed
delete_force(samdb, claim_dn)
try:
samdb.add(details)
except ldb.LdbError as err:
num, estr = err.args
self.assertFalse(force, 'should not fail with force=True')
self.assertEqual(num, ldb.ERR_ENTRY_ALREADY_EXISTS)
else:
# Save the claim DN so it can be deleted in tearDown()
self.test_accounts.append(str(claim_dn))
def create_account(self, samdb, name, account_type=AccountType.USER,
spn=None, upn=None, additional_details=None,
ou=None, account_control=0, add_dollar=None,
expired_password=False, force_nt4_hash=False,
preserve=True):
'''Create an account for testing.
The dn of the created account is added to self.accounts,
which is used by tearDownClass to clean up the created accounts.
'''
if add_dollar is None and account_type is not self.AccountType.USER:
add_dollar = True
if ou is None:
if account_type is self.AccountType.COMPUTER:
guid = DS_GUID_COMPUTERS_CONTAINER
elif account_type is self.AccountType.MANAGED_SERVICE:
guid = DS_GUID_MANAGED_SERVICE_ACCOUNTS_CONTAINER
elif account_type is self.AccountType.SERVER:
guid = DS_GUID_DOMAIN_CONTROLLERS_CONTAINER
else:
guid = DS_GUID_USERS_CONTAINER
ou = samdb.get_wellknown_dn(samdb.get_default_basedn(), guid)
dn = "CN=%s,%s" % (name, ou)
# remove the account if it exists, this will happen if a previous test
# run failed
delete_force(samdb, dn)
account_name = name
if add_dollar:
account_name += '$'
secure_schannel_type = SEC_CHAN_NULL
if account_type is self.AccountType.USER:
object_class = "user"
account_control |= UF_NORMAL_ACCOUNT
elif account_type is self.AccountType.MANAGED_SERVICE:
object_class = "msDS-ManagedServiceAccount"
account_control |= UF_WORKSTATION_TRUST_ACCOUNT
secure_schannel_type = SEC_CHAN_WKSTA
else:
object_class = "computer"
if account_type is self.AccountType.COMPUTER:
account_control |= UF_WORKSTATION_TRUST_ACCOUNT
secure_schannel_type = SEC_CHAN_WKSTA
elif account_type is self.AccountType.SERVER:
account_control |= UF_SERVER_TRUST_ACCOUNT
secure_schannel_type = SEC_CHAN_BDC
else:
self.fail()
password = generate_random_password(32, 32)
utf16pw = ('"%s"' % password).encode('utf-16-le')
details = {
"dn": dn,
"objectClass": object_class,
"sAMAccountName": account_name,
"userAccountControl": str(account_control),
"unicodePwd": utf16pw}
if upn is not None:
upn = upn.format(account=account_name)
if spn is not None:
if isinstance(spn, str):
spn = spn.format(account=account_name)
else:
spn = tuple(s.format(account=account_name) for s in spn)
details["servicePrincipalName"] = spn
if upn is not None:
details["userPrincipalName"] = upn
if expired_password:
details["pwdLastSet"] = "0"
if additional_details is not None:
details.update(additional_details)
if preserve:
# Mark this account for deletion in tearDownClass() after all the
# tests in this class finish.
self.accounts.append(dn)
else:
# Mark this account for deletion in tearDown() after the current
# test finishes. Because the time complexity of deleting an account
# in Samba scales with the number of accounts, it is faster to
# delete accounts as soon as possible than to keep them around
# until all the tests are finished.
self.test_accounts.append(dn)
samdb.add(details)
expected_kvno = 1
if force_nt4_hash:
admin_creds = self.get_admin_creds()
lp = self.get_lp()
net_ctx = net.Net(admin_creds, lp, server=self.dc_host)
domain = samdb.domain_netbios_name().upper()
password = generate_random_password(32, 32)
utf16pw = ('"%s"' % password).encode('utf-16-le')
try:
net_ctx.set_password(newpassword=password,
account_name=account_name,
domain_name=domain,
force_samr_18=True)
expected_kvno += 1
except Exception as e:
self.fail(e)
creds = KerberosCredentials()
creds.guess(self.get_lp())
creds.set_realm(samdb.domain_dns_name().upper())
creds.set_domain(samdb.domain_netbios_name().upper())
creds.set_password(password)
creds.set_username(account_name)
if account_type is self.AccountType.USER:
creds.set_workstation('')
else:
creds.set_workstation(name)
creds.set_secure_channel_type(secure_schannel_type)
creds.set_dn(ldb.Dn(samdb, dn))
creds.set_upn(upn)
creds.set_spn(spn)
creds.set_type(account_type)
self.creds_set_enctypes(creds)
res = samdb.search(base=dn,
scope=ldb.SCOPE_BASE,
attrs=['msDS-KeyVersionNumber',
'objectSid'])
kvno = res[0].get('msDS-KeyVersionNumber', idx=0)
if kvno is not None:
self.assertEqual(int(kvno), expected_kvno)
creds.set_kvno(expected_kvno)
sid = res[0].get('objectSid', idx=0)
sid = samdb.schema_format_value('objectSID', sid)
sid = sid.decode('utf-8')
creds.set_sid(sid)
return (creds, dn)
def get_security_descriptor(self, dn):
samdb = self.get_samdb()
sid = self.get_objectSid(samdb, dn)
owner_sid = security.dom_sid(security.SID_BUILTIN_ADMINISTRATORS)
ace = security.ace()
ace.access_mask = security.SEC_ADS_CONTROL_ACCESS
ace.trustee = security.dom_sid(sid)
dacl = security.acl()
dacl.revision = security.SECURITY_ACL_REVISION_ADS
dacl.aces = [ace]
dacl.num_aces = 1
security_desc = security.descriptor()
security_desc.type |= security.SEC_DESC_DACL_PRESENT
security_desc.owner_sid = owner_sid
security_desc.dacl = dacl
return ndr_pack(security_desc)
def create_rodc(self, ctx):
ctx.nc_list = [ctx.base_dn, ctx.config_dn, ctx.schema_dn]
ctx.full_nc_list = [ctx.base_dn, ctx.config_dn, ctx.schema_dn]
ctx.krbtgt_dn = f'CN=krbtgt_{ctx.myname},CN=Users,{ctx.base_dn}'
ctx.never_reveal_sid = [f'',
f'',
f'',
f'',
f'']
ctx.reveal_sid = f''
mysid = ctx.get_mysid()
admin_dn = f''
ctx.managedby = admin_dn
ctx.userAccountControl = (UF_WORKSTATION_TRUST_ACCOUNT |
UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION |
UF_PARTIAL_SECRETS_ACCOUNT)
ctx.connection_dn = f'CN=RODC Connection (FRS),{ctx.ntds_dn}'
ctx.secure_channel_type = misc.SEC_CHAN_RODC
ctx.RODC = True
ctx.replica_flags = (drsuapi.DRSUAPI_DRS_INIT_SYNC |
drsuapi.DRSUAPI_DRS_PER_SYNC |
drsuapi.DRSUAPI_DRS_GET_ANC |
drsuapi.DRSUAPI_DRS_NEVER_SYNCED |
drsuapi.DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING)
ctx.domain_replica_flags = ctx.replica_flags | drsuapi.DRSUAPI_DRS_CRITICAL_ONLY
ctx.build_nc_lists()
ctx.cleanup_old_join()
try:
ctx.join_add_objects()
except Exception:
# cleanup the failed join (checking we still have a live LDB
# connection to the remote DC first)
ctx.refresh_ldb_connection()
ctx.cleanup_old_join()
raise
def replicate_account_to_rodc(self, dn):
samdb = self.get_samdb()
rodc_samdb = self.get_rodc_samdb()
repl_val = f'{samdb.get_dsServiceName()}:{dn}:SECRETS_ONLY'
msg = ldb.Message()
msg.dn = ldb.Dn(rodc_samdb, '')
msg['replicateSingleObject'] = ldb.MessageElement(
repl_val,
ldb.FLAG_MOD_REPLACE,
'replicateSingleObject')
try:
# Try replication using the replicateSingleObject rootDSE
# operation.
rodc_samdb.modify(msg)
except ldb.LdbError as err:
enum, estr = err.args
self.assertEqual(enum, ldb.ERR_UNWILLING_TO_PERFORM)
self.assertIn('rootdse_modify: unknown attribute to change!',
estr)
# If that method wasn't supported, we may be in the rodc:local test
# environment, where we can try replicating to the local database.
lp = self.get_lp()
rodc_creds = Credentials()
rodc_creds.guess(lp)
rodc_creds.set_machine_account(lp)
local_samdb = SamDB(url=None, session_info=system_session(),
credentials=rodc_creds, lp=lp)
destination_dsa_guid = misc.GUID(local_samdb.get_ntds_GUID())
repl = drs_Replicate(f'ncacn_ip_tcp:{self.dc_host}[seal]',
lp, rodc_creds,
local_samdb, destination_dsa_guid)
source_dsa_invocation_id = misc.GUID(samdb.invocation_id)
repl.replicate(dn,
source_dsa_invocation_id,
destination_dsa_guid,
exop=drsuapi.DRSUAPI_EXOP_REPL_SECRET,
rodc=True)
def reveal_account_to_mock_rodc(self, dn):
samdb = self.get_samdb()
rodc_ctx = self.get_mock_rodc_ctx()
self.get_secrets(
dn,
destination_dsa_guid=rodc_ctx.ntds_guid,
source_dsa_invocation_id=misc.GUID(samdb.invocation_id))
def check_revealed(self, dn, rodc_dn, revealed=True):
samdb = self.get_samdb()
res = samdb.search(base=rodc_dn,
scope=ldb.SCOPE_BASE,
attrs=['msDS-RevealedUsers'])
revealed_users = res[0].get('msDS-RevealedUsers')
if revealed_users is None:
self.assertFalse(revealed)
return
revealed_dns = set(str(dsdb_Dn(samdb, str(user),
syntax_oid=DSDB_SYNTAX_BINARY_DN).dn)
for user in revealed_users)
if revealed:
self.assertIn(str(dn), revealed_dns)
else:
self.assertNotIn(str(dn), revealed_dns)
def get_secrets(self, dn,
destination_dsa_guid,
source_dsa_invocation_id):
bind, handle, _ = self.get_drsuapi_connection()
req = drsuapi.DsGetNCChangesRequest8()
req.destination_dsa_guid = destination_dsa_guid
req.source_dsa_invocation_id = source_dsa_invocation_id
naming_context = drsuapi.DsReplicaObjectIdentifier()
naming_context.dn = dn
req.naming_context = naming_context
hwm = drsuapi.DsReplicaHighWaterMark()
hwm.tmp_highest_usn = 0
hwm.reserved_usn = 0
hwm.highest_usn = 0
req.highwatermark = hwm
req.uptodateness_vector = None
req.replica_flags = 0
req.max_object_count = 1
req.max_ndr_size = 402116
req.extended_op = drsuapi.DRSUAPI_EXOP_REPL_SECRET
attids = [drsuapi.DRSUAPI_ATTID_supplementalCredentials,
drsuapi.DRSUAPI_ATTID_unicodePwd,
drsuapi.DRSUAPI_ATTID_ntPwdHistory]
partial_attribute_set = drsuapi.DsPartialAttributeSet()
partial_attribute_set.version = 1
partial_attribute_set.attids = attids
partial_attribute_set.num_attids = len(attids)
req.partial_attribute_set = partial_attribute_set
req.partial_attribute_set_ex = None
req.mapping_ctr.num_mappings = 0
req.mapping_ctr.mappings = None
_, ctr = bind.DsGetNCChanges(handle, 8, req)
self.assertEqual(1, ctr.object_count)
identifier = ctr.first_object.object.identifier
attributes = ctr.first_object.object.attribute_ctr.attributes
self.assertEqual(dn, identifier.dn)
return bind, identifier, attributes
def get_keys(self, creds, expected_etypes=None):
admin_creds = self.get_admin_creds()
samdb = self.get_samdb()
dn = creds.get_dn()
bind, identifier, attributes = self.get_secrets(
str(dn),
destination_dsa_guid=misc.GUID(samdb.get_ntds_GUID()),
source_dsa_invocation_id=misc.GUID())
rid = identifier.sid.split()[1]
net_ctx = net.Net(admin_creds)
keys = {}
for attr in attributes:
if attr.attid == drsuapi.DRSUAPI_ATTID_supplementalCredentials:
net_ctx.replicate_decrypt(bind, attr, rid)
if attr.value_ctr.num_values == 0:
continue
attr_val = attr.value_ctr.values[0].blob
spl = ndr_unpack(drsblobs.supplementalCredentialsBlob,
attr_val)
for pkg in spl.sub.packages:
if pkg.name == 'Primary:Kerberos-Newer-Keys':
krb5_new_keys_raw = binascii.a2b_hex(pkg.data)
krb5_new_keys = ndr_unpack(
drsblobs.package_PrimaryKerberosBlob,
krb5_new_keys_raw)
for key in krb5_new_keys.ctr.keys:
keytype = key.keytype
if keytype in (kcrypto.Enctype.AES256,
kcrypto.Enctype.AES128):
keys[keytype] = key.value.hex()
elif attr.attid == drsuapi.DRSUAPI_ATTID_unicodePwd:
net_ctx.replicate_decrypt(bind, attr, rid)
if attr.value_ctr.num_values > 0:
pwd = attr.value_ctr.values[0].blob
keys[kcrypto.Enctype.RC4] = pwd.hex()
if expected_etypes is None:
expected_etypes = self.get_default_enctypes(creds)
self.assertCountEqual(expected_etypes, keys)
return keys
def creds_set_keys(self, creds, keys):
if keys is not None:
for enctype, key in keys.items():
creds.set_forced_key(enctype, key)
def creds_set_enctypes(self, creds,
extra_bits=None,
remove_bits=None):
samdb = self.get_samdb()
res = samdb.search(creds.get_dn(),
scope=ldb.SCOPE_BASE,
attrs=['msDS-SupportedEncryptionTypes'])
supported_enctypes = res[0].get('msDS-SupportedEncryptionTypes', idx=0)
if supported_enctypes is None:
supported_enctypes = self.default_etypes
if supported_enctypes is None:
lp = self.get_lp()
supported_enctypes = lp.get('kdc default domain supported enctypes')
if supported_enctypes == 0:
supported_enctypes = rc4_bit | aes256_sk_bit
supported_enctypes = int(supported_enctypes)
if extra_bits is not None:
# We need to add in implicit or implied encryption types.
supported_enctypes |= extra_bits
if remove_bits is not None:
# We also need to remove certain bits, such as the non-encryption
# type bit aes256-sk.
supported_enctypes &= ~remove_bits
creds.set_as_supported_enctypes(supported_enctypes)
creds.set_tgs_supported_enctypes(supported_enctypes)
creds.set_ap_supported_enctypes(supported_enctypes)
def creds_set_default_enctypes(self, creds,
fast_support=False,
claims_support=False,
compound_id_support=False):
default_enctypes = self.get_default_enctypes(creds)
supported_enctypes = KerberosCredentials.etypes_to_bits(
default_enctypes)
if fast_support:
supported_enctypes |= security.KERB_ENCTYPE_FAST_SUPPORTED
if claims_support:
supported_enctypes |= security.KERB_ENCTYPE_CLAIMS_SUPPORTED
if compound_id_support:
supported_enctypes |= (
security.KERB_ENCTYPE_COMPOUND_IDENTITY_SUPPORTED)
creds.set_as_supported_enctypes(supported_enctypes)
creds.set_tgs_supported_enctypes(supported_enctypes)
creds.set_ap_supported_enctypes(supported_enctypes)
def add_to_group(self, account_dn, group_dn, group_attr, expect_attr=True,
new_group_type=None):
samdb = self.get_samdb()
try:
res = samdb.search(base=group_dn,
scope=ldb.SCOPE_BASE,
attrs=[group_attr])
except ldb.LdbError as err:
num, _ = err.args
if num != ldb.ERR_NO_SUCH_OBJECT:
raise
self.fail(err)
orig_msg = res[0]
members = orig_msg.get(group_attr)
if expect_attr:
self.assertIsNotNone(members)
elif members is None:
members = ()
else:
members = map(lambda s: s.decode('utf-8'), members)
# Use a set so we can handle the same group being added twice.
members = set(members)
self.assertNotIsInstance(account_dn, ldb.Dn,
'ldb.MessageElement does not support ldb.Dn')
self.assertNotIsInstance(account_dn, bytes)
if isinstance(account_dn, str):
members.add(account_dn)
else:
members.update(account_dn)
msg = ldb.Message()
msg.dn = group_dn
if new_group_type is not None:
msg['0'] = ldb.MessageElement(
common.normalise_int32(new_group_type),
ldb.FLAG_MOD_REPLACE,
'groupType')
msg['1'] = ldb.MessageElement(list(members),
ldb.FLAG_MOD_REPLACE,
group_attr)
cleanup = samdb.msg_diff(msg, orig_msg)
self.ldb_cleanups.append(cleanup)
samdb.modify(msg)
return cleanup
def remove_from_group(self, account_dn, group_dn):
samdb = self.get_samdb()
res = samdb.search(base=group_dn,
scope=ldb.SCOPE_BASE,
attrs=['member'])
orig_msg = res[0]
self.assertIn('member', orig_msg)
members = list(orig_msg['member'])
account_dn = str(account_dn).encode('utf-8')
self.assertIn(account_dn, members)
members.remove(account_dn)
msg = ldb.Message()
msg.dn = group_dn
msg['member'] = ldb.MessageElement(members,
ldb.FLAG_MOD_REPLACE,
'member')
cleanup = samdb.msg_diff(msg, orig_msg)
self.ldb_cleanups.append(cleanup)
samdb.modify(msg)
return cleanup
# Create a new group and return a Principal object representing it.
def create_group_principal(self, samdb, group_type):
name = self.get_new_username()
dn = self.create_group(samdb, name, gtype=group_type.value)
sid = self.get_objectSid(samdb, dn)
return Principal(ldb.Dn(samdb, dn), sid)
def set_group_type(self, samdb, dn, gtype):
group_type = common.normalise_int32(gtype.value)
msg = ldb.Message(dn)
msg['groupType'] = ldb.MessageElement(group_type,
ldb.FLAG_MOD_REPLACE,
'groupType')
samdb.modify(msg)
def set_primary_group(self, samdb, dn, primary_sid,
expected_error=None,
expected_werror=None):
# Get the RID to be set as our primary group.
primary_rid = primary_sid.rsplit('-', 1)[1]
# Find out our current primary group.
res = samdb.search(dn,
scope=ldb.SCOPE_BASE,
attrs=['primaryGroupId'])
orig_msg = res[0]
# Prepare to modify the attribute.
msg = ldb.Message(dn)
msg['primaryGroupId'] = ldb.MessageElement(str(primary_rid),
ldb.FLAG_MOD_REPLACE,
'primaryGroupId')
# We'll remove the primaryGroupId attribute after the test, to avoid
# problems in the teardown if the user outlives the group.
remove_msg = samdb.msg_diff(msg, orig_msg)
self.addCleanup(samdb.modify, remove_msg)
# Set primaryGroupId.
if expected_error is None:
self.assertIsNone(expected_werror)
samdb.modify(msg)
else:
self.assertIsNotNone(expected_werror)
with self.assertRaises(
ldb.LdbError,
msg='expected setting primary group to fail'
) as err:
samdb.modify(msg)
error, estr = err.exception.args
self.assertEqual(expected_error, error)
self.assertIn(f'{expected_werror:08X}', estr)
# Create an arrangement of groups based on a configuration specified in a
# test case. 'user_principal' is a principal representing the user account;
# 'trust_principal', a principal representing the account of a user from
# another domain.
def setup_groups(self,
samdb,
preexisting_groups,
group_setup,
primary_groups):
groups = dict(preexisting_groups)
primary_group_types = {}
# Create each group and add it to the group mapping.
if group_setup is not None:
for group_id, (group_type, _) in group_setup.items():
self.assertNotIn(group_id, preexisting_groups,
"don't specify placeholders")
self.assertNotIn(group_id, groups,
'group ID specified more than once')
if primary_groups is not None and (
group_id in primary_groups.values()):
# Windows disallows setting a domain-local group as a
# primary group, unless we create it as Universal first and
# change it back to Domain-Local later.
primary_group_types[group_id] = group_type
group_type = GroupType.UNIVERSAL
groups[group_id] = self.create_group_principal(samdb,
group_type)
if group_setup is not None:
# Map a group ID to that group's DN, and generate an
# understandable error message if the mapping fails.
def group_id_to_dn(group_id):
try:
group = groups[group_id]
except KeyError:
self.fail(f"included group member '{group_id}', but it is "
f"not specified in {groups.keys()}")
else:
if group.dn is not None:
return str(group.dn)
return f''
# Populate each group's members.
for group_id, (_, members) in group_setup.items():
# Get the group's DN and the mapped DNs of its members.
dn = groups[group_id].dn
principal_members = map(group_id_to_dn, members)
# Add the members to the group.
self.add_to_group(principal_members, dn, 'member',
expect_attr=False)
# Set primary groups.
if primary_groups is not None:
for user, primary_group in primary_groups.items():
primary_sid = groups[primary_group].sid
self.set_primary_group(samdb, user.dn, primary_sid)
# Change the primary groups to their actual group types.
for primary_group, primary_group_type in primary_group_types.items():
self.set_group_type(samdb,
groups[primary_group].dn,
primary_group_type)
# Return the mapping from group IDs to principals.
return groups
def map_to_sid(self, val, mapping, domain_sid):
if isinstance(val, int):
# If it's an integer, we assume it's a RID, and prefix the domain
# SID.
self.assertIsNotNone(domain_sid)
return f'{domain_sid}-{val}'
if val in mapping:
# Or if we have a mapping for it, apply that.
return mapping[val].sid
# Otherwise leave it unmodified.
return val
def map_to_dn(self, val, mapping, domain_sid):
sid = self.map_to_sid(val, mapping, domain_sid)
return ldb.Dn(self.get_samdb(), f'')
# Return SIDs from principal placeholders based on a supplied mapping.
def map_sids(self, sids, mapping, domain_sid):
if sids is None:
return None
mapped_sids = set()
for entry in sids:
if isinstance(entry, frozenset):
mapped_sids.add(frozenset(self.map_sids(entry,
mapping,
domain_sid)))
else:
val, sid_type, attrs = entry
sid = self.map_to_sid(val, mapping, domain_sid)
# There's no point expecting the 'Claims Valid' SID to be
# present if we don't support claims. Filter it out to give the
# tests a chance of passing.
if not self.kdc_claims_support and (
sid == security.SID_CLAIMS_VALID):
continue
mapped_sids.add((sid, sid_type, attrs))
return mapped_sids
def issued_by_rodc(self, ticket):
krbtgt_creds = self.get_mock_rodc_krbtgt_creds()
krbtgt_key = self.TicketDecryptionKey_from_creds(krbtgt_creds)
checksum_keys = {
krb5pac.PAC_TYPE_KDC_CHECKSUM: krbtgt_key,
}
return self.modified_ticket(
ticket,
new_ticket_key=krbtgt_key,
checksum_keys=checksum_keys)
def signed_by_rodc(self, ticket):
rodc_krbtgt_creds = self.get_mock_rodc_krbtgt_creds()
rodc_krbtgt_key = self.TicketDecryptionKey_from_creds(
rodc_krbtgt_creds)
checksum_keys = {
krb5pac.PAC_TYPE_KDC_CHECKSUM: rodc_krbtgt_key,
}
return self.modified_ticket(ticket,
checksum_keys=checksum_keys)
# Get a ticket with the SIDs in the PAC replaced with ones we specify. This
# is useful for creating arbitrary tickets that can be used to perform a
# TGS-REQ.
def ticket_with_sids(self,
ticket,
new_sids,
domain_sid,
user_rid,
set_user_flags=0,
reset_user_flags=0,
from_rodc=False):
if from_rodc:
krbtgt_creds = self.get_mock_rodc_krbtgt_creds()
else:
krbtgt_creds = self.get_krbtgt_creds()
krbtgt_key = self.TicketDecryptionKey_from_creds(krbtgt_creds)
checksum_keys = {
krb5pac.PAC_TYPE_KDC_CHECKSUM: krbtgt_key
}
modify_pac_fn = partial(self.set_pac_sids,
new_sids=new_sids,
domain_sid=domain_sid,
user_rid=user_rid,
set_user_flags=set_user_flags,
reset_user_flags=reset_user_flags)
return self.modified_ticket(ticket,
new_ticket_key=krbtgt_key,
modify_pac_fn=modify_pac_fn,
checksum_keys=checksum_keys)
# Replace the SIDs in a PAC with 'new_sids'.
def set_pac_sids(self,
pac,
new_sids,
domain_sid,
user_rid,
set_user_flags=0,
reset_user_flags=0):
base_sids = []
extra_sids = []
resource_sids = []
resource_domain = None
primary_gid = None
# Filter our SIDs into three arrays depending on their ultimate
# location in the PAC.
for sid, sid_type, attrs in new_sids:
if sid_type is self.SidType.BASE_SID:
domain, rid = sid.rsplit('-', 1)
self.assertEqual(domain_sid, domain,
f'base SID {sid} must be in our domain')
base_sid = samr.RidWithAttribute()
base_sid.rid = int(rid)
base_sid.attributes = attrs
base_sids.append(base_sid)
elif sid_type is self.SidType.EXTRA_SID:
extra_sid = netlogon.netr_SidAttr()
extra_sid.sid = security.dom_sid(sid)
extra_sid.attributes = attrs
extra_sids.append(extra_sid)
elif sid_type is self.SidType.RESOURCE_SID:
domain, rid = sid.rsplit('-', 1)
if resource_domain is None:
resource_domain = domain
else:
self.assertEqual(resource_domain, domain,
'resource SIDs must share the same '
'domain')
resource_sid = samr.RidWithAttribute()
resource_sid.rid = int(rid)
resource_sid.attributes = attrs
resource_sids.append(resource_sid)
elif sid_type is self.SidType.PRIMARY_GID:
self.assertIsNone(primary_gid,
f'must not specify a second primary GID '
f'{sid}')
self.assertIsNone(attrs, 'cannot specify primary GID attrs')
domain, primary_gid = sid.rsplit('-', 1)
self.assertEqual(domain_sid, domain,
f'primary GID {sid} must be in our domain')
else:
self.fail(f'invalid SID type {sid_type}')
found_logon_info = True
user_sid = security.dom_sid(f'{domain_sid}-{user_rid}')
pac_buffers = pac.buffers
for pac_buffer in pac_buffers:
# Find the LOGON_INFO PAC buffer.
if pac_buffer.type == krb5pac.PAC_TYPE_LOGON_INFO:
logon_info = pac_buffer.info.info
# Add Extra SIDs and set the EXTRA_SIDS flag as needed.
logon_info.info3.sidcount = len(extra_sids)
if extra_sids:
logon_info.info3.sids = extra_sids
logon_info.info3.base.user_flags |= (
netlogon.NETLOGON_EXTRA_SIDS)
else:
logon_info.info3.sids = None
logon_info.info3.base.user_flags &= ~(
netlogon.NETLOGON_EXTRA_SIDS)
# Add Base SIDs.
logon_info.info3.base.groups.count = len(base_sids)
if base_sids:
logon_info.info3.base.groups.rids = base_sids
else:
logon_info.info3.base.groups.rids = None
logon_info.info3.base.domain_sid = security.dom_sid(domain_sid)
logon_info.info3.base.rid = int(user_rid)
if primary_gid is not None:
logon_info.info3.base.primary_gid = int(primary_gid)
# Add Resource SIDs and set the RESOURCE_GROUPS flag as needed.
logon_info.resource_groups.groups.count = len(resource_sids)
if resource_sids:
resource_domain = security.dom_sid(resource_domain)
logon_info.resource_groups.domain_sid = resource_domain
logon_info.resource_groups.groups.rids = resource_sids
logon_info.info3.base.user_flags |= (
netlogon.NETLOGON_RESOURCE_GROUPS)
else:
logon_info.resource_groups.domain_sid = None
logon_info.resource_groups.groups.rids = None
logon_info.info3.base.user_flags &= ~(
netlogon.NETLOGON_RESOURCE_GROUPS)
logon_info.info3.base.user_flags |= set_user_flags
logon_info.info3.base.user_flags &= ~reset_user_flags
found_logon_info = True
# Also replace the user's SID in the UPN DNS buffer.
elif pac_buffer.type == krb5pac.PAC_TYPE_UPN_DNS_INFO:
upn_dns_info_ex = pac_buffer.info.ex
upn_dns_info_ex.objectsid = user_sid
# But don't replace the user's SID in the Requester SID buffer, or
# we'll get a SID mismatch.
self.assertTrue(found_logon_info, 'no LOGON_INFO PAC buffer')
pac.buffers = pac_buffers
return pac
def get_cached_creds(self, *,
account_type,
opts=None,
use_cache=True):
if opts is None:
opts = {}
opts_default = {
'name_prefix': None,
'name_suffix': None,
'add_dollar': None,
'upn': None,
'spn': None,
'additional_details': None,
'allowed_replication': False,
'allowed_replication_mock': False,
'denied_replication': False,
'denied_replication_mock': False,
'revealed_to_rodc': False,
'revealed_to_mock_rodc': False,
'no_auth_data_required': False,
'expired_password': False,
'supported_enctypes': None,
'not_delegated': False,
'delegation_to_spn': None,
'delegation_from_dn': None,
'trusted_to_auth_for_delegation': False,
'fast_support': False,
'claims_support': False,
'compound_id_support': False,
'sid_compression_support': True,
'member_of': None,
'kerberos_enabled': True,
'secure_channel_type': None,
'id': None,
'force_nt4_hash': False,
'assigned_policy': None,
'assigned_silo': None,
'logon_hours': None,
}
account_opts = {
'account_type': account_type,
**opts_default,
**opts
}
if use_cache:
cache_key = tuple(sorted(account_opts.items()))
creds = self.account_cache.get(cache_key)
if creds is not None:
return creds
creds = self.create_account_opts(use_cache, **account_opts)
if use_cache:
self.account_cache[cache_key] = creds
return creds
def create_account_opts(self, use_cache, *,
account_type,
name_prefix,
name_suffix,
add_dollar,
upn,
spn,
additional_details,
allowed_replication,
allowed_replication_mock,
denied_replication,
denied_replication_mock,
revealed_to_rodc,
revealed_to_mock_rodc,
no_auth_data_required,
expired_password,
supported_enctypes,
not_delegated,
delegation_to_spn,
delegation_from_dn,
trusted_to_auth_for_delegation,
fast_support,
claims_support,
compound_id_support,
sid_compression_support,
member_of,
kerberos_enabled,
secure_channel_type,
id,
force_nt4_hash,
assigned_policy,
assigned_silo,
logon_hours):
if account_type is self.AccountType.USER:
self.assertIsNone(delegation_to_spn)
self.assertIsNone(delegation_from_dn)
self.assertFalse(trusted_to_auth_for_delegation)
else:
self.assertFalse(not_delegated)
samdb = self.get_samdb()
user_name = self.get_new_username()
if name_prefix is not None:
user_name = name_prefix + user_name
if name_suffix is not None:
user_name += name_suffix
user_account_control = 0
if trusted_to_auth_for_delegation:
user_account_control |= UF_TRUSTED_TO_AUTHENTICATE_FOR_DELEGATION
if not_delegated:
user_account_control |= UF_NOT_DELEGATED
if no_auth_data_required:
user_account_control |= UF_NO_AUTH_DATA_REQUIRED
if additional_details:
details = {k: v for k, v in additional_details}
else:
details = {}
enctypes = supported_enctypes
if fast_support:
enctypes = enctypes or 0
enctypes |= security.KERB_ENCTYPE_FAST_SUPPORTED
if claims_support:
enctypes = enctypes or 0
enctypes |= security.KERB_ENCTYPE_CLAIMS_SUPPORTED
if compound_id_support:
enctypes = enctypes or 0
enctypes |= security.KERB_ENCTYPE_COMPOUND_IDENTITY_SUPPORTED
if sid_compression_support is False:
enctypes = enctypes or 0
enctypes |= security.KERB_ENCTYPE_RESOURCE_SID_COMPRESSION_DISABLED
if enctypes is not None:
details['msDS-SupportedEncryptionTypes'] = str(enctypes)
if delegation_to_spn:
details['msDS-AllowedToDelegateTo'] = delegation_to_spn
if delegation_from_dn:
if isinstance(delegation_from_dn, str):
delegation_from_dn = self.get_security_descriptor(
delegation_from_dn)
details['msDS-AllowedToActOnBehalfOfOtherIdentity'] = (
delegation_from_dn)
if spn is None and account_type is not self.AccountType.USER:
spn = 'host/' + user_name
if assigned_policy is not None:
details['msDS-AssignedAuthNPolicy'] = assigned_policy
if assigned_silo is not None:
details['msDS-AssignedAuthNPolicySilo'] = assigned_silo
if logon_hours is not None:
details['logonHours'] = logon_hours
creds, dn = self.create_account(samdb, user_name,
account_type=account_type,
upn=upn,
spn=spn,
additional_details=details,
account_control=user_account_control,
add_dollar=add_dollar,
force_nt4_hash=force_nt4_hash,
expired_password=expired_password,
preserve=use_cache)
expected_etypes = None
if force_nt4_hash:
expected_etypes = {kcrypto.Enctype.RC4}
keys = self.get_keys(creds, expected_etypes=expected_etypes)
self.creds_set_keys(creds, keys)
# Handle secret replication to the RODC.
if allowed_replication or revealed_to_rodc:
rodc_samdb = self.get_rodc_samdb()
rodc_dn = self.get_server_dn(rodc_samdb)
# Allow replicating this account's secrets if requested, or allow
# it only temporarily if we're about to replicate them.
allowed_cleanup = self.add_to_group(
dn, rodc_dn,
'msDS-RevealOnDemandGroup')
if revealed_to_rodc:
# Replicate this account's secrets to the RODC.
self.replicate_account_to_rodc(dn)
if not allowed_replication:
# If we don't want replicating secrets to be allowed for this
# account, disable it again.
samdb.modify(allowed_cleanup)
self.check_revealed(dn,
rodc_dn,
revealed=revealed_to_rodc)
if denied_replication:
rodc_samdb = self.get_rodc_samdb()
rodc_dn = self.get_server_dn(rodc_samdb)
# Deny replicating this account's secrets to the RODC.
self.add_to_group(dn, rodc_dn, 'msDS-NeverRevealGroup')
# Handle secret replication to the mock RODC.
if allowed_replication_mock or revealed_to_mock_rodc:
# Allow replicating this account's secrets if requested, or allow
# it only temporarily if we want to add the account to the mock
# RODC's msDS-RevealedUsers.
rodc_ctx = self.get_mock_rodc_ctx()
mock_rodc_dn = ldb.Dn(samdb, rodc_ctx.acct_dn)
allowed_mock_cleanup = self.add_to_group(
dn, mock_rodc_dn,
'msDS-RevealOnDemandGroup')
if revealed_to_mock_rodc:
# Request replicating this account's secrets to the mock RODC,
# which updates msDS-RevealedUsers.
self.reveal_account_to_mock_rodc(dn)
if not allowed_replication_mock:
# If we don't want replicating secrets to be allowed for this
# account, disable it again.
samdb.modify(allowed_mock_cleanup)
self.check_revealed(dn,
mock_rodc_dn,
revealed=revealed_to_mock_rodc)
if denied_replication_mock:
# Deny replicating this account's secrets to the mock RODC.
rodc_ctx = self.get_mock_rodc_ctx()
mock_rodc_dn = ldb.Dn(samdb, rodc_ctx.acct_dn)
self.add_to_group(dn, mock_rodc_dn, 'msDS-NeverRevealGroup')
if member_of is not None:
for group_dn in member_of:
self.add_to_group(dn, ldb.Dn(samdb, group_dn), 'member',
expect_attr=False)
if kerberos_enabled:
creds.set_kerberos_state(MUST_USE_KERBEROS)
else:
creds.set_kerberos_state(DONT_USE_KERBEROS)
if secure_channel_type is not None:
creds.set_secure_channel_type(secure_channel_type)
return creds
def get_new_username(self):
user_name = self.account_base + str(self.account_id)
type(self).account_id += 1
return user_name
def get_client_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
def create_client_account():
return self.get_cached_creds(account_type=self.AccountType.USER)
c = self._get_krb5_creds(prefix='CLIENT',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys,
fallback_creds_fn=create_client_account)
return c
def get_mach_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
def create_mach_account():
return self.get_cached_creds(
account_type=self.AccountType.COMPUTER,
opts={
'fast_support': True,
'claims_support': True,
'compound_id_support': True,
'supported_enctypes': (
security.KERB_ENCTYPE_RC4_HMAC_MD5 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK
),
})
c = self._get_krb5_creds(prefix='MAC',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys,
fallback_creds_fn=create_mach_account)
return c
def get_service_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
def create_service_account():
return self.get_cached_creds(
account_type=self.AccountType.COMPUTER,
opts={
'trusted_to_auth_for_delegation': True,
'fast_support': True,
'claims_support': True,
'compound_id_support': True,
'supported_enctypes': (
security.KERB_ENCTYPE_RC4_HMAC_MD5 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK
),
})
c = self._get_krb5_creds(prefix='SERVICE',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys,
fallback_creds_fn=create_service_account)
return c
def get_rodc_krbtgt_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
def download_rodc_krbtgt_creds():
samdb = self.get_samdb()
rodc_samdb = self.get_rodc_samdb()
rodc_dn = self.get_server_dn(rodc_samdb)
res = samdb.search(rodc_dn,
scope=ldb.SCOPE_BASE,
attrs=['msDS-KrbTgtLink'])
krbtgt_dn = res[0]['msDS-KrbTgtLink'][0]
res = samdb.search(krbtgt_dn,
scope=ldb.SCOPE_BASE,
attrs=['sAMAccountName',
'msDS-KeyVersionNumber',
'msDS-SecondaryKrbTgtNumber'])
krbtgt_dn = res[0].dn
username = str(res[0]['sAMAccountName'])
creds = KerberosCredentials()
creds.set_domain(self.env_get_var('DOMAIN', 'RODC_KRBTGT'))
creds.set_realm(self.env_get_var('REALM', 'RODC_KRBTGT'))
creds.set_username(username)
kvno = int(res[0]['msDS-KeyVersionNumber'][0])
krbtgt_number = int(res[0]['msDS-SecondaryKrbTgtNumber'][0])
rodc_kvno = krbtgt_number << 16 | kvno
creds.set_kvno(rodc_kvno)
creds.set_dn(krbtgt_dn)
keys = self.get_keys(creds)
self.creds_set_keys(creds, keys)
# The RODC krbtgt account should support the default enctypes,
# although it might not have the msDS-SupportedEncryptionTypes
# attribute.
self.creds_set_default_enctypes(
creds,
fast_support=self.kdc_fast_support,
claims_support=self.kdc_claims_support,
compound_id_support=self.kdc_compound_id_support)
return creds
c = self._get_krb5_creds(prefix='RODC_KRBTGT',
allow_missing_password=True,
allow_missing_keys=not require_keys,
require_strongest_key=require_strongest_key,
fallback_creds_fn=download_rodc_krbtgt_creds)
return c
def get_mock_rodc_krbtgt_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
def create_rodc_krbtgt_account():
samdb = self.get_samdb()
rodc_ctx = self.get_mock_rodc_ctx()
krbtgt_dn = rodc_ctx.new_krbtgt_dn
res = samdb.search(base=ldb.Dn(samdb, krbtgt_dn),
scope=ldb.SCOPE_BASE,
attrs=['msDS-KeyVersionNumber',
'msDS-SecondaryKrbTgtNumber'])
dn = res[0].dn
username = str(rodc_ctx.krbtgt_name)
creds = KerberosCredentials()
creds.set_domain(self.env_get_var('DOMAIN', 'RODC_KRBTGT'))
creds.set_realm(self.env_get_var('REALM', 'RODC_KRBTGT'))
creds.set_username(username)
kvno = int(res[0]['msDS-KeyVersionNumber'][0])
krbtgt_number = int(res[0]['msDS-SecondaryKrbTgtNumber'][0])
rodc_kvno = krbtgt_number << 16 | kvno
creds.set_kvno(rodc_kvno)
creds.set_dn(dn)
keys = self.get_keys(creds)
self.creds_set_keys(creds, keys)
if self.get_domain_functional_level() >= DS_DOMAIN_FUNCTION_2008:
extra_bits = (security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96)
else:
extra_bits = 0
remove_bits = (security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK |
security.KERB_ENCTYPE_RC4_HMAC_MD5)
self.creds_set_enctypes(creds,
extra_bits=extra_bits,
remove_bits=remove_bits)
return creds
c = self._get_krb5_creds(prefix='MOCK_RODC_KRBTGT',
allow_missing_password=True,
allow_missing_keys=not require_keys,
require_strongest_key=require_strongest_key,
fallback_creds_fn=create_rodc_krbtgt_account)
return c
def get_krbtgt_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
def download_krbtgt_creds():
samdb = self.get_samdb()
krbtgt_rid = security.DOMAIN_RID_KRBTGT
krbtgt_sid = '%s-%d' % (samdb.get_domain_sid(), krbtgt_rid)
res = samdb.search(base='' % krbtgt_sid,
scope=ldb.SCOPE_BASE,
attrs=['sAMAccountName',
'msDS-KeyVersionNumber'])
dn = res[0].dn
username = str(res[0]['sAMAccountName'])
creds = KerberosCredentials()
creds.set_domain(self.env_get_var('DOMAIN', 'KRBTGT'))
creds.set_realm(self.env_get_var('REALM', 'KRBTGT'))
creds.set_username(username)
kvno = int(res[0]['msDS-KeyVersionNumber'][0])
creds.set_kvno(kvno)
creds.set_dn(dn)
keys = self.get_keys(creds)
self.creds_set_keys(creds, keys)
# The krbtgt account should support the default enctypes, although
# it might not (on Samba) have the msDS-SupportedEncryptionTypes
# attribute.
self.creds_set_default_enctypes(
creds,
fast_support=self.kdc_fast_support,
claims_support=self.kdc_claims_support,
compound_id_support=self.kdc_compound_id_support)
return creds
c = self._get_krb5_creds(prefix='KRBTGT',
default_username='krbtgt',
allow_missing_password=True,
allow_missing_keys=not require_keys,
require_strongest_key=require_strongest_key,
fallback_creds_fn=download_krbtgt_creds)
return c
def get_dc_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
def download_dc_creds():
samdb = self.get_samdb()
dc_rid = 1000
dc_sid = '%s-%d' % (samdb.get_domain_sid(), dc_rid)
res = samdb.search(base='' % dc_sid,
scope=ldb.SCOPE_BASE,
attrs=['sAMAccountName',
'msDS-KeyVersionNumber'])
dn = res[0].dn
username = str(res[0]['sAMAccountName'])
creds = KerberosCredentials()
creds.set_domain(self.env_get_var('DOMAIN', 'DC'))
creds.set_realm(self.env_get_var('REALM', 'DC'))
creds.set_username(username)
kvno = int(res[0]['msDS-KeyVersionNumber'][0])
creds.set_kvno(kvno)
creds.set_workstation(username[:-1])
creds.set_dn(dn)
keys = self.get_keys(creds)
self.creds_set_keys(creds, keys)
if self.get_domain_functional_level() >= DS_DOMAIN_FUNCTION_2008:
extra_bits = (security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96)
else:
extra_bits = 0
remove_bits = security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK
self.creds_set_enctypes(creds,
extra_bits=extra_bits,
remove_bits=remove_bits)
return creds
c = self._get_krb5_creds(prefix='DC',
allow_missing_password=True,
allow_missing_keys=not require_keys,
require_strongest_key=require_strongest_key,
fallback_creds_fn=download_dc_creds)
return c
def get_server_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
def download_server_creds():
samdb = self.get_samdb()
res = samdb.search(base=samdb.get_default_basedn(),
expression=(f'(|(sAMAccountName={self.host}*)'
f'(dNSHostName={self.host}))'),
scope=ldb.SCOPE_SUBTREE,
attrs=['sAMAccountName',
'msDS-KeyVersionNumber'])
self.assertEqual(1, len(res))
dn = res[0].dn
username = str(res[0]['sAMAccountName'])
creds = KerberosCredentials()
creds.set_domain(self.env_get_var('DOMAIN', 'SERVER'))
creds.set_realm(self.env_get_var('REALM', 'SERVER'))
creds.set_username(username)
kvno = int(res[0]['msDS-KeyVersionNumber'][0])
creds.set_kvno(kvno)
creds.set_dn(dn)
keys = self.get_keys(creds)
self.creds_set_keys(creds, keys)
if self.get_domain_functional_level() >= DS_DOMAIN_FUNCTION_2008:
extra_bits = (security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96)
else:
extra_bits = 0
remove_bits = security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96_SK
self.creds_set_enctypes(creds,
extra_bits=extra_bits,
remove_bits=remove_bits)
return creds
c = self._get_krb5_creds(prefix='SERVER',
allow_missing_password=True,
allow_missing_keys=not require_keys,
require_strongest_key=require_strongest_key,
fallback_creds_fn=download_server_creds)
return c
# Get the credentials and server principal name of either the krbtgt, or a
# specially created account, with resource SID compression either supported
# or unsupported.
def get_target(self,
to_krbtgt, *,
compound_id=None,
compression=None,
extra_enctypes=0):
if to_krbtgt:
self.assertIsNone(compound_id,
"it's no good specifying compound id support "
"for the krbtgt")
self.assertIsNone(compression,
"it's no good specifying compression support "
"for the krbtgt")
self.assertFalse(extra_enctypes,
"it's no good specifying extra enctypes "
"for the krbtgt")
creds = self.get_krbtgt_creds()
sname = self.get_krbtgt_sname()
else:
creds = self.get_cached_creds(
account_type=self.AccountType.COMPUTER,
opts={
'supported_enctypes':
security.KERB_ENCTYPE_RC4_HMAC_MD5 |
security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96 |
extra_enctypes,
'compound_id_support': compound_id,
'sid_compression_support': compression,
})
target_name = creds.get_username()
if target_name[-1] == '$':
target_name = target_name[:-1]
sname = self.PrincipalName_create(
name_type=NT_PRINCIPAL,
names=['host', target_name])
return creds, sname
def as_req(self, cname, sname, realm, etypes, padata=None, kdc_options=0):
'''Send a Kerberos AS_REQ, returns the undecoded response
'''
till = self.get_KerberosTime(offset=36000)
req = self.AS_REQ_create(padata=padata,
kdc_options=str(kdc_options),
cname=cname,
realm=realm,
sname=sname,
from_time=None,
till_time=till,
renew_time=None,
nonce=0x7fffffff,
etypes=etypes,
addresses=None,
additional_tickets=None)
rep = self.send_recv_transaction(req)
return rep
def get_as_rep_key(self, creds, rep):
'''Extract the session key from an AS-REP
'''
rep_padata = self.der_decode(
rep['e-data'],
asn1Spec=krb5_asn1.METHOD_DATA())
for pa in rep_padata:
if pa['padata-type'] == PADATA_ETYPE_INFO2:
padata_value = pa['padata-value']
break
else:
self.fail('expected to find ETYPE-INFO2')
etype_info2 = self.der_decode(
padata_value, asn1Spec=krb5_asn1.ETYPE_INFO2())
key = self.PasswordKey_from_etype_info2(creds, etype_info2[0],
creds.get_kvno())
return key
def get_enc_timestamp_pa_data(self, creds, rep, skew=0):
'''generate the pa_data data element for an AS-REQ
'''
key = self.get_as_rep_key(creds, rep)
return self.get_enc_timestamp_pa_data_from_key(key, skew=skew)
def get_enc_timestamp_pa_data_from_key(self, key, skew=0):
(patime, pausec) = self.get_KerberosTimeWithUsec(offset=skew)
padata = self.PA_ENC_TS_ENC_create(patime, pausec)
padata = self.der_encode(padata, asn1Spec=krb5_asn1.PA_ENC_TS_ENC())
padata = self.EncryptedData_create(key, KU_PA_ENC_TIMESTAMP, padata)
padata = self.der_encode(padata, asn1Spec=krb5_asn1.EncryptedData())
padata = self.PA_DATA_create(PADATA_ENC_TIMESTAMP, padata)
return padata
def get_challenge_pa_data(self, client_challenge_key, skew=0):
patime, pausec = self.get_KerberosTimeWithUsec(offset=skew)
padata = self.PA_ENC_TS_ENC_create(patime, pausec)
padata = self.der_encode(padata,
asn1Spec=krb5_asn1.PA_ENC_TS_ENC())
padata = self.EncryptedData_create(client_challenge_key,
KU_ENC_CHALLENGE_CLIENT,
padata)
padata = self.der_encode(padata,
asn1Spec=krb5_asn1.EncryptedData())
padata = self.PA_DATA_create(PADATA_ENCRYPTED_CHALLENGE,
padata)
return padata
def get_as_rep_enc_data(self, key, rep):
''' Decrypt and Decode the encrypted data in an AS-REP
'''
enc_part = key.decrypt(KU_AS_REP_ENC_PART, rep['enc-part']['cipher'])
# MIT KDC encodes both EncASRepPart and EncTGSRepPart with
# application tag 26
try:
enc_part = self.der_decode(
enc_part, asn1Spec=krb5_asn1.EncASRepPart())
except Exception:
enc_part = self.der_decode(
enc_part, asn1Spec=krb5_asn1.EncTGSRepPart())
return enc_part
def check_pre_authentication(self, rep):
""" Check that the kdc response was pre-authentication required
"""
self.check_error_rep(rep, KDC_ERR_PREAUTH_REQUIRED)
def check_as_reply(self, rep):
""" Check that the kdc response is an AS-REP and that the
values for:
msg-type
pvno
tkt-pvno
kvno
match the expected values
"""
self.check_reply(rep, msg_type=KRB_AS_REP)
def check_tgs_reply(self, rep):
""" Check that the kdc response is an TGS-REP and that the
values for:
msg-type
pvno
tkt-pvno
kvno
match the expected values
"""
self.check_reply(rep, msg_type=KRB_TGS_REP)
def check_reply(self, rep, msg_type):
# Should have a reply, and it should an TGS-REP message.
self.assertIsNotNone(rep)
self.assertEqual(rep['msg-type'], msg_type, "rep = {%s}" % rep)
# Protocol version number should be 5
pvno = int(rep['pvno'])
self.assertEqual(5, pvno, "rep = {%s}" % rep)
# The ticket version number should be 5
tkt_vno = int(rep['ticket']['tkt-vno'])
self.assertEqual(5, tkt_vno, "rep = {%s}" % rep)
# Check that the kvno is not an RODC kvno
# MIT kerberos does not provide the kvno, so we treat it as optional.
# This is tested in compatability_test.py
if 'kvno' in rep['enc-part']:
kvno = int(rep['enc-part']['kvno'])
# If the high order bits are set this is an RODC kvno.
self.assertEqual(0, kvno & 0xFFFF0000, "rep = {%s}" % rep)
def check_error_rep(self, rep, expected):
""" Check that the reply is an error message, with the expected
error-code specified.
"""
self.assertIsNotNone(rep)
self.assertEqual(rep['msg-type'], KRB_ERROR, "rep = {%s}" % rep)
if isinstance(expected, collections.abc.Container):
self.assertIn(rep['error-code'], expected, "rep = {%s}" % rep)
else:
self.assertEqual(rep['error-code'], expected, "rep = {%s}" % rep)
def tgs_req(self, cname, sname, realm, ticket, key, etypes,
expected_error_mode=0, padata=None, kdc_options=0,
to_rodc=False, creds=None, service_creds=None, expect_pac=True,
expect_edata=None, expected_flags=None, unexpected_flags=None):
'''Send a TGS-REQ, returns the response and the decrypted and
decoded enc-part
'''
subkey = self.RandomKey(key.etype)
(ctime, cusec) = self.get_KerberosTimeWithUsec()
tgt = KerberosTicketCreds(ticket,
key,
crealm=realm,
cname=cname)
if service_creds is not None:
decryption_key = self.TicketDecryptionKey_from_creds(
service_creds)
expected_supported_etypes = service_creds.tgs_supported_enctypes
else:
decryption_key = None
expected_supported_etypes = None
if not expected_error_mode:
check_error_fn = None
check_rep_fn = self.generic_check_kdc_rep
else:
check_error_fn = self.generic_check_kdc_error
check_rep_fn = None
def generate_padata(_kdc_exchange_dict,
_callback_dict,
req_body):
return padata, req_body
kdc_exchange_dict = self.tgs_exchange_dict(
creds=creds,
expected_crealm=realm,
expected_cname=cname,
expected_srealm=realm,
expected_sname=sname,
expected_error_mode=expected_error_mode,
expected_flags=expected_flags,
unexpected_flags=unexpected_flags,
expected_supported_etypes=expected_supported_etypes,
check_error_fn=check_error_fn,
check_rep_fn=check_rep_fn,
check_kdc_private_fn=self.generic_check_kdc_private,
ticket_decryption_key=decryption_key,
generate_padata_fn=generate_padata if padata is not None else None,
tgt=tgt,
authenticator_subkey=subkey,
kdc_options=str(kdc_options),
expect_edata=expect_edata,
expect_pac=expect_pac,
to_rodc=to_rodc)
rep = self._generic_kdc_exchange(kdc_exchange_dict,
cname=None,
realm=realm,
sname=sname,
etypes=etypes)
if expected_error_mode:
enc_part = None
else:
ticket_creds = kdc_exchange_dict['rep_ticket_creds']
enc_part = ticket_creds.encpart_private
return rep, enc_part
def get_service_ticket(self, tgt, target_creds, service='host',
sname=None,
target_name=None, till=None, rc4_support=True,
to_rodc=False, kdc_options=None,
expected_flags=None, unexpected_flags=None,
expected_groups=None,
unexpected_groups=None,
expect_client_claims=None,
expect_device_claims=None,
expected_client_claims=None,
unexpected_client_claims=None,
expected_device_claims=None,
unexpected_device_claims=None,
pac_request=True, expect_pac=True, fresh=False):
user_name = tgt.cname['name-string'][0]
ticket_sname = tgt.sname
if target_name is None:
target_name = target_creds.get_username()[:-1]
else:
self.assertIsNone(sname, 'supplied both target name and sname')
cache_key = (user_name, target_name, service, to_rodc, kdc_options,
pac_request, str(expected_flags), str(unexpected_flags),
till, rc4_support,
str(ticket_sname),
str(sname),
str(expected_groups),
str(unexpected_groups),
expect_client_claims, expect_device_claims,
str(expected_client_claims),
str(unexpected_client_claims),
str(expected_device_claims),
str(unexpected_device_claims),
expect_pac)
if not fresh:
ticket = self.tkt_cache.get(cache_key)
if ticket is not None:
return ticket
etype = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5)
if kdc_options is None:
kdc_options = '0'
kdc_options = str(krb5_asn1.KDCOptions(kdc_options))
if sname is None:
sname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=[service, target_name])
srealm = target_creds.get_realm()
authenticator_subkey = self.RandomKey(kcrypto.Enctype.AES256)
decryption_key = self.TicketDecryptionKey_from_creds(target_creds)
kdc_exchange_dict = self.tgs_exchange_dict(
expected_crealm=tgt.crealm,
expected_cname=tgt.cname,
expected_srealm=srealm,
expected_sname=sname,
expected_supported_etypes=target_creds.tgs_supported_enctypes,
expected_flags=expected_flags,
unexpected_flags=unexpected_flags,
expected_groups=expected_groups,
unexpected_groups=unexpected_groups,
expect_client_claims=expect_client_claims,
expect_device_claims=expect_device_claims,
expected_client_claims=expected_client_claims,
unexpected_client_claims=unexpected_client_claims,
expected_device_claims=expected_device_claims,
unexpected_device_claims=unexpected_device_claims,
ticket_decryption_key=decryption_key,
check_rep_fn=self.generic_check_kdc_rep,
check_kdc_private_fn=self.generic_check_kdc_private,
tgt=tgt,
authenticator_subkey=authenticator_subkey,
kdc_options=kdc_options,
pac_request=pac_request,
expect_pac=expect_pac,
rc4_support=rc4_support,
to_rodc=to_rodc)
rep = self._generic_kdc_exchange(kdc_exchange_dict,
cname=None,
realm=srealm,
sname=sname,
till_time=till,
etypes=etype)
self.check_tgs_reply(rep)
service_ticket_creds = kdc_exchange_dict['rep_ticket_creds']
if to_rodc:
krbtgt_creds = self.get_rodc_krbtgt_creds()
else:
krbtgt_creds = self.get_krbtgt_creds()
krbtgt_key = self.TicketDecryptionKey_from_creds(krbtgt_creds)
is_tgs_princ = self.is_tgs_principal(sname)
expect_ticket_checksum = (self.tkt_sig_support
and not is_tgs_princ)
expect_full_checksum = (self.full_sig_support
and not is_tgs_princ)
self.verify_ticket(service_ticket_creds, krbtgt_key,
service_ticket=True, expect_pac=expect_pac,
expect_ticket_checksum=expect_ticket_checksum,
expect_full_checksum=expect_full_checksum)
self.tkt_cache[cache_key] = service_ticket_creds
return service_ticket_creds
def get_tgt(self, creds, to_rodc=False, kdc_options=None,
client_account=None, client_name_type=NT_PRINCIPAL,
target_creds=None, ticket_etype=None,
expected_flags=None, unexpected_flags=None,
expected_account_name=None, expected_upn_name=None,
expected_cname=None,
expected_sid=None,
sname=None, realm=None,
expected_groups=None,
unexpected_groups=None,
pac_request=True, expect_pac=True,
expect_pac_attrs=None, expect_pac_attrs_pac_request=None,
pac_options=None,
expect_requester_sid=None,
rc4_support=True,
expect_edata=None,
expect_client_claims=None, expect_device_claims=None,
expected_client_claims=None, unexpected_client_claims=None,
expected_device_claims=None, unexpected_device_claims=None,
fresh=False):
if client_account is not None:
user_name = client_account
else:
user_name = creds.get_username()
cache_key = (user_name, to_rodc, kdc_options, pac_request, pac_options,
client_name_type,
ticket_etype,
str(expected_flags), str(unexpected_flags),
expected_account_name, expected_upn_name, expected_sid,
str(sname), str(realm),
str(expected_groups),
str(unexpected_groups),
str(expected_cname),
rc4_support,
expect_pac, expect_pac_attrs,
expect_pac_attrs_pac_request, expect_requester_sid,
expect_client_claims, expect_device_claims,
str(expected_client_claims),
str(unexpected_client_claims),
str(expected_device_claims),
str(unexpected_device_claims))
if not fresh:
tgt = self.tkt_cache.get(cache_key)
if tgt is not None:
return tgt
if realm is None:
realm = creds.get_realm()
salt = creds.get_salt()
etype = self.get_default_enctypes(creds)
cname = self.PrincipalName_create(name_type=client_name_type,
names=user_name.split('/'))
if sname is None:
sname = self.PrincipalName_create(name_type=NT_SRV_INST,
names=['krbtgt', realm])
expected_sname = self.PrincipalName_create(
name_type=NT_SRV_INST, names=['krbtgt', realm.upper()])
else:
expected_sname = sname
if expected_cname is None:
expected_cname = cname
till = self.get_KerberosTime(offset=36000)
if target_creds is not None:
krbtgt_creds = target_creds
elif to_rodc:
krbtgt_creds = self.get_rodc_krbtgt_creds()
else:
krbtgt_creds = self.get_krbtgt_creds()
ticket_decryption_key = (
self.TicketDecryptionKey_from_creds(krbtgt_creds,
etype=ticket_etype))
expected_etypes = krbtgt_creds.tgs_supported_enctypes
if kdc_options is None:
kdc_options = ('forwardable,'
'renewable,'
'canonicalize,'
'renewable-ok')
kdc_options = krb5_asn1.KDCOptions(kdc_options)
if pac_options is None:
pac_options = '1' # supports claims
rep, kdc_exchange_dict = self._test_as_exchange(
creds=creds,
cname=cname,
realm=realm,
sname=sname,
till=till,
expected_error_mode=KDC_ERR_PREAUTH_REQUIRED,
expected_crealm=realm,
expected_cname=expected_cname,
expected_srealm=realm,
expected_sname=sname,
expected_account_name=expected_account_name,
expected_upn_name=expected_upn_name,
expected_sid=expected_sid,
expected_groups=expected_groups,
unexpected_groups=unexpected_groups,
expected_salt=salt,
expected_flags=expected_flags,
unexpected_flags=unexpected_flags,
expected_supported_etypes=expected_etypes,
etypes=etype,
padata=None,
kdc_options=kdc_options,
preauth_key=None,
ticket_decryption_key=ticket_decryption_key,
pac_request=pac_request,
pac_options=pac_options,
expect_pac=expect_pac,
expect_pac_attrs=expect_pac_attrs,
expect_pac_attrs_pac_request=expect_pac_attrs_pac_request,
expect_requester_sid=expect_requester_sid,
rc4_support=rc4_support,
expect_client_claims=expect_client_claims,
expect_device_claims=expect_device_claims,
expected_client_claims=expected_client_claims,
unexpected_client_claims=unexpected_client_claims,
expected_device_claims=expected_device_claims,
unexpected_device_claims=unexpected_device_claims,
to_rodc=to_rodc)
self.check_pre_authentication(rep)
etype_info2 = kdc_exchange_dict['preauth_etype_info2']
preauth_key = self.PasswordKey_from_etype_info2(creds,
etype_info2[0],
creds.get_kvno())
ts_enc_padata = self.get_enc_timestamp_pa_data_from_key(preauth_key)
padata = [ts_enc_padata]
expected_realm = realm.upper()
rep, kdc_exchange_dict = self._test_as_exchange(
creds=creds,
cname=cname,
realm=realm,
sname=sname,
till=till,
expected_error_mode=0,
expected_crealm=expected_realm,
expected_cname=expected_cname,
expected_srealm=expected_realm,
expected_sname=expected_sname,
expected_account_name=expected_account_name,
expected_upn_name=expected_upn_name,
expected_sid=expected_sid,
expected_groups=expected_groups,
unexpected_groups=unexpected_groups,
expected_salt=salt,
expected_flags=expected_flags,
unexpected_flags=unexpected_flags,
expected_supported_etypes=expected_etypes,
etypes=etype,
padata=padata,
kdc_options=kdc_options,
preauth_key=preauth_key,
ticket_decryption_key=ticket_decryption_key,
pac_request=pac_request,
pac_options=pac_options,
expect_pac=expect_pac,
expect_pac_attrs=expect_pac_attrs,
expect_pac_attrs_pac_request=expect_pac_attrs_pac_request,
expect_requester_sid=expect_requester_sid,
rc4_support=rc4_support,
expect_client_claims=expect_client_claims,
expect_device_claims=expect_device_claims,
expected_client_claims=expected_client_claims,
unexpected_client_claims=unexpected_client_claims,
expected_device_claims=expected_device_claims,
unexpected_device_claims=unexpected_device_claims,
to_rodc=to_rodc)
self.check_as_reply(rep)
ticket_creds = kdc_exchange_dict['rep_ticket_creds']
self.tkt_cache[cache_key] = ticket_creds
return ticket_creds
def _make_tgs_request(self, client_creds, service_creds, tgt,
client_account=None,
client_name_type=NT_PRINCIPAL,
kdc_options=None,
pac_request=None, expect_pac=True,
expect_error=False,
expected_cname=None,
expected_account_name=None,
expected_upn_name=None,
expected_sid=None):
if client_account is None:
client_account = client_creds.get_username()
cname = self.PrincipalName_create(name_type=client_name_type,
names=client_account.split('/'))
service_account = service_creds.get_username()
sname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=[service_account])
realm = service_creds.get_realm()
expected_crealm = realm
if expected_cname is None:
expected_cname = cname
expected_srealm = realm
expected_sname = sname
expected_supported_etypes = service_creds.tgs_supported_enctypes
etypes = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5)
if kdc_options is None:
kdc_options = 'canonicalize'
kdc_options = str(krb5_asn1.KDCOptions(kdc_options))
target_decryption_key = self.TicketDecryptionKey_from_creds(
service_creds)
authenticator_subkey = self.RandomKey(kcrypto.Enctype.AES256)
if expect_error:
expected_error_mode = expect_error
if expected_error_mode is True:
expected_error_mode = KDC_ERR_TGT_REVOKED
check_error_fn = self.generic_check_kdc_error
check_rep_fn = None
else:
expected_error_mode = 0
check_error_fn = None
check_rep_fn = self.generic_check_kdc_rep
kdc_exchange_dict = self.tgs_exchange_dict(
expected_crealm=expected_crealm,
expected_cname=expected_cname,
expected_srealm=expected_srealm,
expected_sname=expected_sname,
expected_account_name=expected_account_name,
expected_upn_name=expected_upn_name,
expected_sid=expected_sid,
expected_supported_etypes=expected_supported_etypes,
ticket_decryption_key=target_decryption_key,
check_error_fn=check_error_fn,
check_rep_fn=check_rep_fn,
check_kdc_private_fn=self.generic_check_kdc_private,
expected_error_mode=expected_error_mode,
tgt=tgt,
authenticator_subkey=authenticator_subkey,
kdc_options=kdc_options,
pac_request=pac_request,
expect_pac=expect_pac,
expect_edata=False)
rep = self._generic_kdc_exchange(kdc_exchange_dict,
cname=cname,
realm=realm,
sname=sname,
etypes=etypes)
if expect_error:
self.check_error_rep(rep, expected_error_mode)
return None
else:
self.check_reply(rep, KRB_TGS_REP)
return kdc_exchange_dict['rep_ticket_creds']
# Named tuple to contain values of interest when the PAC is decoded.
PacData = namedtuple(
"PacData",
"account_name account_sid logon_name upn domain_name")
def get_pac_data(self, authorization_data):
'''Decode the PAC element contained in the authorization-data element
'''
account_name = None
user_sid = None
logon_name = None
upn = None
domain_name = None
# The PAC data will be wrapped in an AD_IF_RELEVANT element
ad_if_relevant_elements = (
x for x in authorization_data if x['ad-type'] == AD_IF_RELEVANT)
for dt in ad_if_relevant_elements:
buf = self.der_decode(
dt['ad-data'], asn1Spec=krb5_asn1.AD_IF_RELEVANT())
# The PAC data is further wrapped in a AD_WIN2K_PAC element
for ad in (x for x in buf if x['ad-type'] == AD_WIN2K_PAC):
pb = ndr_unpack(krb5pac.PAC_DATA, ad['ad-data'])
for pac in pb.buffers:
if pac.type == krb5pac.PAC_TYPE_LOGON_INFO:
account_name = (
pac.info.info.info3.base.account_name)
user_sid = (
str(pac.info.info.info3.base.domain_sid)
+ "-" + str(pac.info.info.info3.base.rid))
elif pac.type == krb5pac.PAC_TYPE_LOGON_NAME:
logon_name = pac.info.account_name
elif pac.type == krb5pac.PAC_TYPE_UPN_DNS_INFO:
upn = pac.info.upn_name
domain_name = pac.info.dns_domain_name
return self.PacData(
account_name,
user_sid,
logon_name,
upn,
domain_name)
def decode_service_ticket(self, creds, ticket):
'''Decrypt and decode a service ticket
'''
enc_part = ticket['enc-part']
key = self.TicketDecryptionKey_from_creds(creds,
enc_part['etype'])
if key.kvno is not None:
self.assertElementKVNO(enc_part, 'kvno', key.kvno)
enc_part = key.decrypt(KU_TICKET, enc_part['cipher'])
enc_ticket_part = self.der_decode(
enc_part, asn1Spec=krb5_asn1.EncTicketPart())
return enc_ticket_part
def modify_ticket_flag(self, enc_part, flag, value):
self.assertIsInstance(value, bool)
flag = krb5_asn1.TicketFlags(flag)
pos = len(tuple(flag)) - 1
flags = enc_part['flags']
self.assertLessEqual(pos, len(flags))
new_flags = flags[:pos] + str(int(value)) + flags[pos + 1:]
enc_part['flags'] = new_flags
return enc_part
def get_objectSid(self, samdb, dn):
''' Get the objectSID for a DN
Note: performs an Ldb query.
'''
res = samdb.search(dn, scope=SCOPE_BASE, attrs=["objectSID"])
self.assertTrue(len(res) == 1, "did not get objectSid for %s" % dn)
sid = samdb.schema_format_value("objectSID", res[0]["objectSID"][0])
return sid.decode('utf8')
def add_attribute(self, samdb, dn_str, name, value):
if isinstance(value, list):
values = value
else:
values = [value]
flag = ldb.FLAG_MOD_ADD
dn = ldb.Dn(samdb, dn_str)
msg = ldb.Message(dn)
msg[name] = ldb.MessageElement(values, flag, name)
samdb.modify(msg)
def modify_attribute(self, samdb, dn_str, name, value):
if isinstance(value, list):
values = value
else:
values = [value]
flag = ldb.FLAG_MOD_REPLACE
dn = ldb.Dn(samdb, dn_str)
msg = ldb.Message(dn)
msg[name] = ldb.MessageElement(values, flag, name)
samdb.modify(msg)
def remove_attribute(self, samdb, dn_str, name):
flag = ldb.FLAG_MOD_DELETE
dn = ldb.Dn(samdb, dn_str)
msg = ldb.Message(dn)
msg[name] = ldb.MessageElement([], flag, name)
samdb.modify(msg)
def create_ccache(self, cname, ticket, enc_part):
""" Lay out a version 4 on-disk credentials cache, to be read using the
FILE: protocol.
"""
field = krb5ccache.DELTATIME_TAG()
field.kdc_sec_offset = 0
field.kdc_usec_offset = 0
v4tag = krb5ccache.V4TAG()
v4tag.tag = 1
v4tag.field = field
v4tags = krb5ccache.V4TAGS()
v4tags.tag = v4tag
v4tags.further_tags = b''
optional_header = krb5ccache.V4HEADER()
optional_header.v4tags = v4tags
cname_string = cname['name-string']
cprincipal = krb5ccache.PRINCIPAL()
cprincipal.name_type = cname['name-type']
cprincipal.component_count = len(cname_string)
cprincipal.realm = ticket['realm']
cprincipal.components = cname_string
sname = ticket['sname']
sname_string = sname['name-string']
sprincipal = krb5ccache.PRINCIPAL()
sprincipal.name_type = sname['name-type']
sprincipal.component_count = len(sname_string)
sprincipal.realm = ticket['realm']
sprincipal.components = sname_string
key = self.EncryptionKey_import(enc_part['key'])
key_data = key.export_obj()
keyblock = krb5ccache.KEYBLOCK()
keyblock.enctype = key_data['keytype']
keyblock.data = key_data['keyvalue']
addresses = krb5ccache.ADDRESSES()
addresses.count = 0
addresses.data = []
authdata = krb5ccache.AUTHDATA()
authdata.count = 0
authdata.data = []
# Re-encode the ticket, since it was decoded by another layer.
ticket_data = self.der_encode(ticket, asn1Spec=krb5_asn1.Ticket())
authtime = enc_part['authtime']
starttime = enc_part.get('starttime', authtime)
endtime = enc_part['endtime']
cred = krb5ccache.CREDENTIAL()
cred.client = cprincipal
cred.server = sprincipal
cred.keyblock = keyblock
cred.authtime = self.get_EpochFromKerberosTime(authtime)
cred.starttime = self.get_EpochFromKerberosTime(starttime)
cred.endtime = self.get_EpochFromKerberosTime(endtime)
# Account for clock skew of up to five minutes.
self.assertLess(cred.authtime - 5 * 60,
datetime.now(timezone.utc).timestamp(),
"Ticket not yet valid - clocks may be out of sync.")
self.assertLess(cred.starttime - 5 * 60,
datetime.now(timezone.utc).timestamp(),
"Ticket not yet valid - clocks may be out of sync.")
self.assertGreater(cred.endtime - 60 * 60,
datetime.now(timezone.utc).timestamp(),
"Ticket already expired/about to expire - "
"clocks may be out of sync.")
cred.renew_till = cred.endtime
cred.is_skey = 0
cred.ticket_flags = int(enc_part['flags'], 2)
cred.addresses = addresses
cred.authdata = authdata
cred.ticket = ticket_data
cred.second_ticket = b''
ccache = krb5ccache.CCACHE()
ccache.pvno = 5
ccache.version = 4
ccache.optional_header = optional_header
ccache.principal = cprincipal
ccache.cred = cred
# Serialise the credentials cache structure.
result = ndr_pack(ccache)
# Create a temporary file and write the credentials.
cachefile = tempfile.NamedTemporaryFile(dir=self.tempdir, delete=False)
cachefile.write(result)
cachefile.close()
return cachefile
def create_ccache_with_ticket(self, user_credentials, ticket, pac=True):
# Place the ticket into a newly created credentials cache file.
user_name = user_credentials.get_username()
realm = user_credentials.get_realm()
cname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=[user_name])
if not pac:
ticket = self.modified_ticket(ticket, exclude_pac=True)
# Write the ticket into a credentials cache file that can be ingested
# by the main credentials code.
cachefile = self.create_ccache(cname, ticket.ticket,
ticket.encpart_private)
# Create a credentials object to reference the credentials cache.
creds = Credentials()
creds.set_kerberos_state(MUST_USE_KERBEROS)
creds.set_username(user_name, SPECIFIED)
creds.set_realm(realm)
creds.set_named_ccache(cachefile.name, SPECIFIED, self.get_lp())
# Return the credentials along with the cache file.
return (creds, cachefile)
def create_ccache_with_user(self, user_credentials, mach_credentials,
service="host", target_name=None, pac=True):
# Obtain a service ticket authorising the user and place it into a
# newly created credentials cache file.
tgt = self.get_tgt(user_credentials)
ticket = self.get_service_ticket(tgt, mach_credentials,
service=service,
target_name=target_name)
return self.create_ccache_with_ticket(user_credentials, ticket,
pac=pac)
# Test credentials by connecting to the DC through LDAP.
def _connect(self, creds, simple_bind, expect_error=None):
samdb = self.get_samdb()
dn = creds.get_dn()
if simple_bind:
url = f'ldaps://{samdb.host_dns_name()}'
creds.set_bind_dn(str(dn))
else:
url = f'ldap://{samdb.host_dns_name()}'
creds.set_bind_dn(None)
try:
ldap = SamDB(url=url,
credentials=creds,
lp=self.get_lp())
except ldb.LdbError as err:
self.assertIsNotNone(expect_error, 'got unexpected error')
num, estr = err.args
if num != ldb.ERR_INVALID_CREDENTIALS:
raise
self.assertIn(expect_error, estr)
return
else:
self.assertIsNone(expect_error, 'expected to get an error')
res = ldap.search('',
scope=ldb.SCOPE_BASE,
attrs=['tokenGroups'])
self.assertEqual(1, len(res))
sid = creds.get_sid()
token_groups = res[0].get('tokenGroups', idx=0)
token_sid = ndr_unpack(security.dom_sid, token_groups)
self.assertEqual(sid, str(token_sid))
# Test the two SAMR password change methods implemented in Samba. If the
# user is protected, we should get an ACCOUNT_RESTRICTION error indicating
# that the password change is not allowed.
def _test_samr_change_password(self, creds, expect_error,
connect_error=None):
samdb = self.get_samdb()
server_name = samdb.host_dns_name()
try:
conn = samr.samr(f'ncacn_np:{server_name}[seal,smb2]',
self.get_lp(),
creds)
except NTSTATUSError as err:
self.assertIsNotNone(connect_error,
'connection unexpectedly failed')
self.assertIsNone(expect_error, 'don’t specify both errors')
num, _ = err.args
self.assertEqual(num, connect_error)
return
else:
self.assertIsNone(connect_error, 'expected connection to fail')
# Get the NT hash.
nt_hash = creds.get_nt_hash()
# Generate a new UTF-16 password.
new_password_str = generate_random_password(32, 32)
new_password = new_password_str.encode('utf-16le')
# Generate the MD4 hash of the password.
new_password_md4 = md4_hash_blob(new_password)
# Prefix the password with padding so it is 512 bytes long.
new_password_len = len(new_password)
remaining_len = 512 - new_password_len
new_password = bytes(remaining_len) + new_password
# Append the 32-bit length of the password.
new_password += int.to_bytes(new_password_len,
length=4,
byteorder='little')
# Create a key from the MD4 hash of the new password.
key = new_password_md4[:14]
# Encrypt the old NT hash with DES to obtain the verifier.
verifier = des_crypt_blob_16(nt_hash, key)
server = lsa.String()
server.string = server_name
account = lsa.String()
account.string = creds.get_username()
nt_verifier = samr.Password()
nt_verifier.hash = list(verifier)
nt_password = samr.CryptPassword()
nt_password.data = list(arcfour_encrypt(nt_hash, new_password))
if not self.expect_nt_hash:
expect_error = ntstatus.NT_STATUS_NTLM_BLOCKED
try:
conn.ChangePasswordUser2(server=server,
account=account,
nt_password=nt_password,
nt_verifier=nt_verifier,
lm_change=False,
lm_password=None,
lm_verifier=None)
except NTSTATUSError as err:
num, _ = err.args
self.assertIsNotNone(expect_error,
f'unexpectedly failed with {num:08X}')
self.assertEqual(num, expect_error)
else:
self.assertIsNone(expect_error, 'expected to fail')
creds.set_password(new_password_str)
# Get the NT hash.
nt_hash = creds.get_nt_hash()
# Generate a new UTF-16 password.
new_password = generate_random_password(32, 32)
new_password = new_password.encode('utf-16le')
# Generate the MD4 hash of the password.
new_password_md4 = md4_hash_blob(new_password)
# Prefix the password with padding so it is 512 bytes long.
new_password_len = len(new_password)
remaining_len = 512 - new_password_len
new_password = bytes(remaining_len) + new_password
# Append the 32-bit length of the password.
new_password += int.to_bytes(new_password_len,
length=4,
byteorder='little')
# Create a key from the MD4 hash of the new password.
key = new_password_md4[:14]
# Encrypt the old NT hash with DES to obtain the verifier.
verifier = des_crypt_blob_16(nt_hash, key)
nt_verifier.hash = list(verifier)
nt_password.data = list(arcfour_encrypt(nt_hash, new_password))
try:
conn.ChangePasswordUser3(server=server,
account=account,
nt_password=nt_password,
nt_verifier=nt_verifier,
lm_change=False,
lm_password=None,
lm_verifier=None,
password3=None)
except NTSTATUSError as err:
self.assertIsNotNone(expect_error, 'unexpectedly failed')
num, _ = err.args
self.assertEqual(num, expect_error)
else:
self.assertIsNone(expect_error, 'expected to fail')
# Test SamLogon. Authentication should succeed for non-protected accounts,
# and fail for protected accounts.
def _test_samlogon(self, creds, logon_type, expect_error=None,
validation_level=netlogon.NetlogonValidationSamInfo2,
domain_joined_mach_creds=None):
samdb = self.get_samdb()
if domain_joined_mach_creds is None:
domain_joined_mach_creds = self.get_cached_creds(
account_type=self.AccountType.COMPUTER,
opts={'secure_channel_type': misc.SEC_CHAN_WKSTA})
dc_server = samdb.host_dns_name()
username, domain = creds.get_ntlm_username_domain()
workstation = domain_joined_mach_creds.get_username()
# Calling this initializes netlogon_creds on mach_creds, as is required
# before calling mach_creds.encrypt_samr_password().
conn = netlogon.netlogon(f'ncacn_ip_tcp:{dc_server}[schannel,seal]',
self.get_lp(),
domain_joined_mach_creds)
if logon_type == netlogon.NetlogonInteractiveInformation:
logon = netlogon.netr_PasswordInfo()
lm_pass = samr.Password()
lm_pass.hash = [0] * 16
nt_pass = samr.Password()
nt_pass.hash = list(creds.get_nt_hash())
domain_joined_mach_creds.encrypt_samr_password(nt_pass)
logon.lmpassword = lm_pass
logon.ntpassword = nt_pass
elif logon_type == netlogon.NetlogonNetworkInformation:
computername = ntlmssp.AV_PAIR()
computername.AvId = ntlmssp.MsvAvNbComputerName
computername.Value = workstation
domainname = ntlmssp.AV_PAIR()
domainname.AvId = ntlmssp.MsvAvNbDomainName
domainname.Value = domain
eol = ntlmssp.AV_PAIR()
eol.AvId = ntlmssp.MsvAvEOL
target_info = ntlmssp.AV_PAIR_LIST()
target_info.count = 3
target_info.pair = [domainname, computername, eol]
target_info_blob = ndr_pack(target_info)
challenge = b'abcdefgh'
response = creds.get_ntlm_response(flags=0,
challenge=challenge,
target_info=target_info_blob)
logon = netlogon.netr_NetworkInfo()
logon.challenge = list(challenge)
logon.nt = netlogon.netr_ChallengeResponse()
logon.nt.length = len(response['nt_response'])
logon.nt.data = list(response['nt_response'])
else:
self.fail(f'unknown logon type {logon_type}')
identity_info = netlogon.netr_IdentityInfo()
identity_info.domain_name.string = domain
identity_info.account_name.string = username
identity_info.parameter_control = (
netlogon.MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT) | (
netlogon.MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)
identity_info.workstation.string = workstation
logon.identity_info = identity_info
netr_flags = 0
validation = None
if not expect_error and not self.expect_nt_hash:
expect_error = ntstatus.NT_STATUS_NTLM_BLOCKED
try:
(validation, authoritative, flags) = (
conn.netr_LogonSamLogonEx(dc_server,
domain_joined_mach_creds.get_workstation(),
logon_type,
logon,
validation_level,
netr_flags))
except NTSTATUSError as err:
status, _ = err.args
self.assertIsNotNone(expect_error,
f'unexpectedly failed with {status:08X}')
self.assertEqual(expect_error, status, 'got wrong status code')
else:
self.assertIsNone(expect_error, 'expected error')
self.assertEqual(1, authoritative)
self.assertEqual(0, flags)
return validation