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|
# Unix SMB/CIFS implementation.
# Copyright (C) Isaac Boukris 2020
# Copyright (C) Stefan Metzmacher 2020
#
# 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 sys
import socket
import struct
import time
import datetime
import random
import binascii
import itertools
import collections
from pyasn1.codec.der.decoder import decode as pyasn1_der_decode
from pyasn1.codec.der.encoder import encode as pyasn1_der_encode
from pyasn1.codec.native.decoder import decode as pyasn1_native_decode
from pyasn1.codec.native.encoder import encode as pyasn1_native_encode
from pyasn1.codec.ber.encoder import BitStringEncoder
from samba.credentials import Credentials
from samba.dcerpc import security
from samba.gensec import FEATURE_SEAL
import samba.tests
from samba.tests import TestCaseInTempDir
import samba.tests.krb5.rfc4120_pyasn1 as krb5_asn1
from samba.tests.krb5.rfc4120_constants import (
KDC_ERR_GENERIC,
KRB_AP_REQ,
KRB_AS_REP,
KRB_AS_REQ,
KRB_ERROR,
KRB_TGS_REP,
KRB_TGS_REQ,
KU_AP_REQ_AUTH,
KU_AS_REP_ENC_PART,
KU_NON_KERB_CKSUM_SALT,
KU_TGS_REP_ENC_PART_SESSION,
KU_TGS_REP_ENC_PART_SUB_KEY,
KU_TGS_REQ_AUTH,
KU_TGS_REQ_AUTH_CKSUM,
KU_TGS_REQ_AUTH_DAT_SESSION,
KU_TGS_REQ_AUTH_DAT_SUBKEY,
KU_TICKET,
PADATA_ENC_TIMESTAMP,
PADATA_ETYPE_INFO,
PADATA_ETYPE_INFO2,
PADATA_FOR_USER,
PADATA_KDC_REQ,
PADATA_PAC_REQUEST,
PADATA_PK_AS_REQ,
PADATA_PK_AS_REP_19
)
import samba.tests.krb5.kcrypto as kcrypto
def BitStringEncoder_encodeValue32(
self, value, asn1Spec, encodeFun, **options):
#
# BitStrings like KDCOptions or TicketFlags should at least
# be 32-Bit on the wire
#
if asn1Spec is not None:
# TODO: try to avoid ASN.1 schema instantiation
value = asn1Spec.clone(value)
valueLength = len(value)
if valueLength % 8:
alignedValue = value << (8 - valueLength % 8)
else:
alignedValue = value
substrate = alignedValue.asOctets()
length = len(substrate)
# We need at least 32-Bit / 4-Bytes
if length < 4:
padding = 4 - length
else:
padding = 0
ret = b'\x00' + substrate + (b'\x00' * padding)
return ret, False, True
BitStringEncoder.encodeValue = BitStringEncoder_encodeValue32
def BitString_NamedValues_prettyPrint(self, scope=0):
ret = "%s" % self.asBinary()
bits = []
highest_bit = 32
for byte in self.asNumbers():
for bit in [7, 6, 5, 4, 3, 2, 1, 0]:
mask = 1 << bit
if byte & mask:
val = 1
else:
val = 0
bits.append(val)
if len(bits) < highest_bit:
for bitPosition in range(len(bits), highest_bit):
bits.append(0)
indent = " " * scope
delim = ": (\n%s " % indent
for bitPosition in range(highest_bit):
if bitPosition in self.prettyPrintNamedValues:
name = self.prettyPrintNamedValues[bitPosition]
elif bits[bitPosition] != 0:
name = "unknown-bit-%u" % bitPosition
else:
continue
ret += "%s%s:%u" % (delim, name, bits[bitPosition])
delim = ",\n%s " % indent
ret += "\n%s)" % indent
return ret
krb5_asn1.TicketFlags.prettyPrintNamedValues =\
krb5_asn1.TicketFlagsValues.namedValues
krb5_asn1.TicketFlags.namedValues =\
krb5_asn1.TicketFlagsValues.namedValues
krb5_asn1.TicketFlags.prettyPrint =\
BitString_NamedValues_prettyPrint
krb5_asn1.KDCOptions.prettyPrintNamedValues =\
krb5_asn1.KDCOptionsValues.namedValues
krb5_asn1.KDCOptions.namedValues =\
krb5_asn1.KDCOptionsValues.namedValues
krb5_asn1.KDCOptions.prettyPrint =\
BitString_NamedValues_prettyPrint
krb5_asn1.APOptions.prettyPrintNamedValues =\
krb5_asn1.APOptionsValues.namedValues
krb5_asn1.APOptions.namedValues =\
krb5_asn1.APOptionsValues.namedValues
krb5_asn1.APOptions.prettyPrint =\
BitString_NamedValues_prettyPrint
krb5_asn1.PACOptionFlags.prettyPrintNamedValues =\
krb5_asn1.PACOptionFlagsValues.namedValues
krb5_asn1.PACOptionFlags.namedValues =\
krb5_asn1.PACOptionFlagsValues.namedValues
krb5_asn1.PACOptionFlags.prettyPrint =\
BitString_NamedValues_prettyPrint
def Integer_NamedValues_prettyPrint(self, scope=0):
intval = int(self)
if intval in self.prettyPrintNamedValues:
name = self.prettyPrintNamedValues[intval]
else:
name = "<__unknown__>"
ret = "%d (0x%x) %s" % (intval, intval, name)
return ret
krb5_asn1.NameType.prettyPrintNamedValues =\
krb5_asn1.NameTypeValues.namedValues
krb5_asn1.NameType.prettyPrint =\
Integer_NamedValues_prettyPrint
krb5_asn1.AuthDataType.prettyPrintNamedValues =\
krb5_asn1.AuthDataTypeValues.namedValues
krb5_asn1.AuthDataType.prettyPrint =\
Integer_NamedValues_prettyPrint
krb5_asn1.PADataType.prettyPrintNamedValues =\
krb5_asn1.PADataTypeValues.namedValues
krb5_asn1.PADataType.prettyPrint =\
Integer_NamedValues_prettyPrint
krb5_asn1.EncryptionType.prettyPrintNamedValues =\
krb5_asn1.EncryptionTypeValues.namedValues
krb5_asn1.EncryptionType.prettyPrint =\
Integer_NamedValues_prettyPrint
krb5_asn1.ChecksumType.prettyPrintNamedValues =\
krb5_asn1.ChecksumTypeValues.namedValues
krb5_asn1.ChecksumType.prettyPrint =\
Integer_NamedValues_prettyPrint
krb5_asn1.KerbErrorDataType.prettyPrintNamedValues =\
krb5_asn1.KerbErrorDataTypeValues.namedValues
krb5_asn1.KerbErrorDataType.prettyPrint =\
Integer_NamedValues_prettyPrint
class Krb5EncryptionKey:
def __init__(self, key, kvno):
EncTypeChecksum = {
kcrypto.Enctype.AES256: kcrypto.Cksumtype.SHA1_AES256,
kcrypto.Enctype.AES128: kcrypto.Cksumtype.SHA1_AES128,
kcrypto.Enctype.RC4: kcrypto.Cksumtype.HMAC_MD5,
}
self.key = key
self.etype = key.enctype
self.ctype = EncTypeChecksum[self.etype]
self.kvno = kvno
def encrypt(self, usage, plaintext):
ciphertext = kcrypto.encrypt(self.key, usage, plaintext)
return ciphertext
def decrypt(self, usage, ciphertext):
plaintext = kcrypto.decrypt(self.key, usage, ciphertext)
return plaintext
def make_checksum(self, usage, plaintext, ctype=None):
if ctype is None:
ctype = self.ctype
cksum = kcrypto.make_checksum(ctype, self.key, usage, plaintext)
return cksum
def export_obj(self):
EncryptionKey_obj = {
'keytype': self.etype,
'keyvalue': self.key.contents,
}
return EncryptionKey_obj
class KerberosCredentials(Credentials):
def __init__(self):
super(KerberosCredentials, self).__init__()
all_enc_types = 0
all_enc_types |= security.KERB_ENCTYPE_RC4_HMAC_MD5
all_enc_types |= security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96
all_enc_types |= security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96
self.as_supported_enctypes = all_enc_types
self.tgs_supported_enctypes = all_enc_types
self.ap_supported_enctypes = all_enc_types
self.kvno = None
self.forced_keys = {}
self.forced_salt = None
def set_as_supported_enctypes(self, value):
self.as_supported_enctypes = int(value)
def set_tgs_supported_enctypes(self, value):
self.tgs_supported_enctypes = int(value)
def set_ap_supported_enctypes(self, value):
self.ap_supported_enctypes = int(value)
def _get_krb5_etypes(self, supported_enctypes):
etypes = ()
if supported_enctypes & security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96:
etypes += (kcrypto.Enctype.AES256,)
if supported_enctypes & security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96:
etypes += (kcrypto.Enctype.AES128,)
if supported_enctypes & security.KERB_ENCTYPE_RC4_HMAC_MD5:
etypes += (kcrypto.Enctype.RC4,)
return etypes
def get_as_krb5_etypes(self):
return self._get_krb5_etypes(self.as_supported_enctypes)
def get_tgs_krb5_etypes(self):
return self._get_krb5_etypes(self.tgs_supported_enctypes)
def get_ap_krb5_etypes(self):
return self._get_krb5_etypes(self.ap_supported_enctypes)
def set_kvno(self, kvno):
self.kvno = kvno
def get_kvno(self):
return self.kvno
def set_forced_key(self, etype, hexkey):
etype = int(etype)
contents = binascii.a2b_hex(hexkey)
key = kcrypto.Key(etype, contents)
self.forced_keys[etype] = Krb5EncryptionKey(key, self.kvno)
def get_forced_key(self, etype):
etype = int(etype)
return self.forced_keys.get(etype, None)
def set_forced_salt(self, salt):
self.forced_salt = bytes(salt)
def get_forced_salt(self):
return self.forced_salt
def get_salt(self):
if self.forced_salt is not None:
return self.forced_salt
if self.get_workstation():
salt_string = '%shost%s.%s' % (
self.get_realm().upper(),
self.get_username().lower().rsplit('$', 1)[0],
self.get_realm().lower())
else:
salt_string = self.get_realm().upper() + self.get_username()
return salt_string.encode('utf-8')
class KerberosTicketCreds:
def __init__(self, ticket, session_key,
crealm=None, cname=None,
srealm=None, sname=None,
decryption_key=None,
ticket_private=None,
encpart_private=None):
self.ticket = ticket
self.session_key = session_key
self.crealm = crealm
self.cname = cname
self.srealm = srealm
self.sname = sname
self.decryption_key = decryption_key
self.ticket_private = ticket_private
self.encpart_private = encpart_private
class RawKerberosTest(TestCaseInTempDir):
"""A raw Kerberos Test case."""
etypes_to_test = (
{"value": -1111, "name": "dummy", },
{"value": kcrypto.Enctype.AES256, "name": "aes128", },
{"value": kcrypto.Enctype.AES128, "name": "aes256", },
{"value": kcrypto.Enctype.RC4, "name": "rc4", },
)
setup_etype_test_permutations_done = False
@classmethod
def setup_etype_test_permutations(cls):
if cls.setup_etype_test_permutations_done:
return
res = []
num_idxs = len(cls.etypes_to_test)
permutations = []
for num in range(1, num_idxs + 1):
chunk = list(itertools.permutations(range(num_idxs), num))
for e in chunk:
el = list(e)
permutations.append(el)
for p in permutations:
name = None
etypes = ()
for idx in p:
n = cls.etypes_to_test[idx]["name"]
if name is None:
name = n
else:
name += "_%s" % n
etypes += (cls.etypes_to_test[idx]["value"],)
r = {"name": name, "etypes": etypes, }
res.append(r)
cls.etype_test_permutations = res
cls.setup_etype_test_permutations_done = True
@classmethod
def etype_test_permutation_name_idx(cls):
cls.setup_etype_test_permutations()
res = []
idx = 0
for e in cls.etype_test_permutations:
r = (e['name'], idx)
idx += 1
res.append(r)
return res
def etype_test_permutation_by_idx(self, idx):
e = self.etype_test_permutations[idx]
return (e['name'], e['etypes'])
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.host = samba.tests.env_get_var_value('SERVER')
# A dictionary containing credentials that have already been
# obtained.
cls.creds_dict = {}
def setUp(self):
super().setUp()
self.do_asn1_print = False
self.do_hexdump = False
strict_checking = samba.tests.env_get_var_value('STRICT_CHECKING',
allow_missing=True)
if strict_checking is None:
strict_checking = '1'
self.strict_checking = bool(int(strict_checking))
self.s = None
self.unspecified_kvno = object()
def tearDown(self):
self._disconnect("tearDown")
super().tearDown()
def _disconnect(self, reason):
if self.s is None:
return
self.s.close()
self.s = None
if self.do_hexdump:
sys.stderr.write("disconnect[%s]\n" % reason)
def _connect_tcp(self):
tcp_port = 88
try:
self.a = socket.getaddrinfo(self.host, tcp_port, socket.AF_UNSPEC,
socket.SOCK_STREAM, socket.SOL_TCP,
0)
self.s = socket.socket(self.a[0][0], self.a[0][1], self.a[0][2])
self.s.settimeout(10)
self.s.connect(self.a[0][4])
except socket.error:
self.s.close()
raise
except IOError:
self.s.close()
raise
def connect(self):
self.assertNotConnected()
self._connect_tcp()
if self.do_hexdump:
sys.stderr.write("connected[%s]\n" % self.host)
def env_get_var(self, varname, prefix,
fallback_default=True,
allow_missing=False):
val = None
if prefix is not None:
allow_missing_prefix = allow_missing or fallback_default
val = samba.tests.env_get_var_value(
'%s_%s' % (prefix, varname),
allow_missing=allow_missing_prefix)
else:
fallback_default = True
if val is None and fallback_default:
val = samba.tests.env_get_var_value(varname,
allow_missing=allow_missing)
return val
def _get_krb5_creds_from_env(self, prefix,
default_username=None,
allow_missing_password=False,
allow_missing_keys=True,
require_strongest_key=False):
c = KerberosCredentials()
c.guess()
domain = self.env_get_var('DOMAIN', prefix)
realm = self.env_get_var('REALM', prefix)
allow_missing_username = default_username is not None
username = self.env_get_var('USERNAME', prefix,
fallback_default=False,
allow_missing=allow_missing_username)
if username is None:
username = default_username
password = self.env_get_var('PASSWORD', prefix,
fallback_default=False,
allow_missing=allow_missing_password)
c.set_domain(domain)
c.set_realm(realm)
c.set_username(username)
if password is not None:
c.set_password(password)
as_supported_enctypes = self.env_get_var('AS_SUPPORTED_ENCTYPES',
prefix, allow_missing=True)
if as_supported_enctypes is not None:
c.set_as_supported_enctypes(as_supported_enctypes)
tgs_supported_enctypes = self.env_get_var('TGS_SUPPORTED_ENCTYPES',
prefix, allow_missing=True)
if tgs_supported_enctypes is not None:
c.set_tgs_supported_enctypes(tgs_supported_enctypes)
ap_supported_enctypes = self.env_get_var('AP_SUPPORTED_ENCTYPES',
prefix, allow_missing=True)
if ap_supported_enctypes is not None:
c.set_ap_supported_enctypes(ap_supported_enctypes)
if require_strongest_key:
kvno_allow_missing = False
if password is None:
aes256_allow_missing = False
else:
aes256_allow_missing = True
else:
kvno_allow_missing = allow_missing_keys
aes256_allow_missing = allow_missing_keys
kvno = self.env_get_var('KVNO', prefix,
fallback_default=False,
allow_missing=kvno_allow_missing)
if kvno is not None:
c.set_kvno(kvno)
aes256_key = self.env_get_var('AES256_KEY_HEX', prefix,
fallback_default=False,
allow_missing=aes256_allow_missing)
if aes256_key is not None:
c.set_forced_key(kcrypto.Enctype.AES256, aes256_key)
aes128_key = self.env_get_var('AES128_KEY_HEX', prefix,
fallback_default=False,
allow_missing=True)
if aes128_key is not None:
c.set_forced_key(kcrypto.Enctype.AES128, aes128_key)
rc4_key = self.env_get_var('RC4_KEY_HEX', prefix,
fallback_default=False, allow_missing=True)
if rc4_key is not None:
c.set_forced_key(kcrypto.Enctype.RC4, rc4_key)
if not allow_missing_keys:
self.assertTrue(c.forced_keys,
'Please supply %s encryption keys '
'in environment' % prefix)
return c
def _get_krb5_creds(self,
prefix,
default_username=None,
allow_missing_password=False,
allow_missing_keys=True,
require_strongest_key=False,
fallback_creds_fn=None):
if prefix in self.creds_dict:
return self.creds_dict[prefix]
# We don't have the credentials already
creds = None
env_err = None
try:
# Try to obtain them from the environment
creds = self._get_krb5_creds_from_env(
prefix,
default_username=default_username,
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys,
require_strongest_key=require_strongest_key)
except Exception as err:
# An error occurred, so save it for later
env_err = err
else:
self.assertIsNotNone(creds)
# Save the obtained credentials
self.creds_dict[prefix] = creds
return creds
if fallback_creds_fn is not None:
try:
# Try to use the fallback method
creds = fallback_creds_fn()
except Exception as err:
print("ERROR FROM ENV: %r" % (env_err))
print("FALLBACK-FN: %s" % (fallback_creds_fn))
print("FALLBACK-ERROR: %r" % (err))
else:
self.assertIsNotNone(creds)
# Save the obtained credentials
self.creds_dict[prefix] = creds
return creds
# Both methods failed, so raise the exception from the
# environment method
raise env_err
def get_user_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix=None,
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
return c
def get_service_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='SERVICE',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
return c
def get_client_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='CLIENT',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
return c
def get_server_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='SERVER',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
return c
def get_admin_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='ADMIN',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
c.set_gensec_features(c.get_gensec_features() | FEATURE_SEAL)
return c
def get_krbtgt_creds(self,
require_keys=True,
require_strongest_key=False):
if require_strongest_key:
self.assertTrue(require_keys)
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)
return c
def get_anon_creds(self):
c = Credentials()
c.set_anonymous()
return c
def asn1_dump(self, name, obj, asn1_print=None):
if asn1_print is None:
asn1_print = self.do_asn1_print
if asn1_print:
if name is not None:
sys.stderr.write("%s:\n%s" % (name, obj))
else:
sys.stderr.write("%s" % (obj))
def hex_dump(self, name, blob, hexdump=None):
if hexdump is None:
hexdump = self.do_hexdump
if hexdump:
sys.stderr.write(
"%s: %d\n%s" % (name, len(blob), self.hexdump(blob)))
def der_decode(
self,
blob,
asn1Spec=None,
native_encode=True,
asn1_print=None,
hexdump=None):
if asn1Spec is not None:
class_name = type(asn1Spec).__name__.split(':')[0]
else:
class_name = "<None-asn1Spec>"
self.hex_dump(class_name, blob, hexdump=hexdump)
obj, _ = pyasn1_der_decode(blob, asn1Spec=asn1Spec)
self.asn1_dump(None, obj, asn1_print=asn1_print)
if native_encode:
obj = pyasn1_native_encode(obj)
return obj
def der_encode(
self,
obj,
asn1Spec=None,
native_decode=True,
asn1_print=None,
hexdump=None):
if native_decode:
obj = pyasn1_native_decode(obj, asn1Spec=asn1Spec)
class_name = type(obj).__name__.split(':')[0]
if class_name is not None:
self.asn1_dump(None, obj, asn1_print=asn1_print)
blob = pyasn1_der_encode(obj)
if class_name is not None:
self.hex_dump(class_name, blob, hexdump=hexdump)
return blob
def send_pdu(self, req, asn1_print=None, hexdump=None):
try:
k5_pdu = self.der_encode(
req, native_decode=False, asn1_print=asn1_print, hexdump=False)
header = struct.pack('>I', len(k5_pdu))
req_pdu = header
req_pdu += k5_pdu
self.hex_dump("send_pdu", header, hexdump=hexdump)
self.hex_dump("send_pdu", k5_pdu, hexdump=hexdump)
while True:
sent = self.s.send(req_pdu, 0)
if sent == len(req_pdu):
break
req_pdu = req_pdu[sent:]
except socket.error as e:
self._disconnect("send_pdu: %s" % e)
raise
except IOError as e:
self._disconnect("send_pdu: %s" % e)
raise
def recv_raw(self, num_recv=0xffff, hexdump=None, timeout=None):
rep_pdu = None
try:
if timeout is not None:
self.s.settimeout(timeout)
rep_pdu = self.s.recv(num_recv, 0)
self.s.settimeout(10)
if len(rep_pdu) == 0:
self._disconnect("recv_raw: EOF")
return None
self.hex_dump("recv_raw", rep_pdu, hexdump=hexdump)
except socket.timeout:
self.s.settimeout(10)
sys.stderr.write("recv_raw: TIMEOUT\n")
except socket.error as e:
self._disconnect("recv_raw: %s" % e)
raise
except IOError as e:
self._disconnect("recv_raw: %s" % e)
raise
return rep_pdu
def recv_pdu_raw(self, asn1_print=None, hexdump=None, timeout=None):
rep_pdu = None
rep = None
raw_pdu = self.recv_raw(
num_recv=4, hexdump=hexdump, timeout=timeout)
if raw_pdu is None:
return (None, None)
header = struct.unpack(">I", raw_pdu[0:4])
k5_len = header[0]
if k5_len == 0:
return (None, "")
missing = k5_len
rep_pdu = b''
while missing > 0:
raw_pdu = self.recv_raw(
num_recv=missing, hexdump=hexdump, timeout=timeout)
self.assertGreaterEqual(len(raw_pdu), 1)
rep_pdu += raw_pdu
missing = k5_len - len(rep_pdu)
k5_raw = self.der_decode(
rep_pdu,
asn1Spec=None,
native_encode=False,
asn1_print=False,
hexdump=False)
pvno = k5_raw['field-0']
self.assertEqual(pvno, 5)
msg_type = k5_raw['field-1']
self.assertIn(msg_type, [KRB_AS_REP, KRB_TGS_REP, KRB_ERROR])
if msg_type == KRB_AS_REP:
asn1Spec = krb5_asn1.AS_REP()
elif msg_type == KRB_TGS_REP:
asn1Spec = krb5_asn1.TGS_REP()
elif msg_type == KRB_ERROR:
asn1Spec = krb5_asn1.KRB_ERROR()
rep = self.der_decode(rep_pdu, asn1Spec=asn1Spec,
asn1_print=asn1_print, hexdump=False)
return (rep, rep_pdu)
def recv_pdu(self, asn1_print=None, hexdump=None, timeout=None):
(rep, rep_pdu) = self.recv_pdu_raw(asn1_print=asn1_print,
hexdump=hexdump,
timeout=timeout)
return rep
def assertIsConnected(self):
self.assertIsNotNone(self.s, msg="Not connected")
def assertNotConnected(self):
self.assertIsNone(self.s, msg="Is connected")
def send_recv_transaction(
self,
req,
asn1_print=None,
hexdump=None,
timeout=None):
self.connect()
try:
self.send_pdu(req, asn1_print=asn1_print, hexdump=hexdump)
rep = self.recv_pdu(
asn1_print=asn1_print, hexdump=hexdump, timeout=timeout)
except Exception:
self._disconnect("transaction failed")
raise
self._disconnect("transaction done")
return rep
def assertNoValue(self, value):
self.assertTrue(value.isNoValue)
def assertHasValue(self, value):
self.assertIsNotNone(value)
def getElementValue(self, obj, elem):
return obj.get(elem, None)
def assertElementMissing(self, obj, elem):
v = self.getElementValue(obj, elem)
self.assertIsNone(v)
def assertElementPresent(self, obj, elem):
v = self.getElementValue(obj, elem)
self.assertIsNotNone(v)
if self.strict_checking:
if isinstance(v, collections.abc.Container):
self.assertNotEqual(0, len(v))
def assertElementEqual(self, obj, elem, value):
v = self.getElementValue(obj, elem)
self.assertIsNotNone(v)
self.assertEqual(v, value)
def assertElementEqualUTF8(self, obj, elem, value):
v = self.getElementValue(obj, elem)
self.assertIsNotNone(v)
self.assertEqual(v, bytes(value, 'utf8'))
def assertPrincipalEqual(self, princ1, princ2):
self.assertEqual(princ1['name-type'], princ2['name-type'])
self.assertEqual(
len(princ1['name-string']),
len(princ2['name-string']),
msg="princ1=%s != princ2=%s" % (princ1, princ2))
for idx in range(len(princ1['name-string'])):
self.assertEqual(
princ1['name-string'][idx],
princ2['name-string'][idx],
msg="princ1=%s != princ2=%s" % (princ1, princ2))
def assertElementEqualPrincipal(self, obj, elem, value):
v = self.getElementValue(obj, elem)
self.assertIsNotNone(v)
v = pyasn1_native_decode(v, asn1Spec=krb5_asn1.PrincipalName())
self.assertPrincipalEqual(v, value)
def assertElementKVNO(self, obj, elem, value):
v = self.getElementValue(obj, elem)
if value == "autodetect":
value = v
if value is not None:
self.assertIsNotNone(v)
# The value on the wire should never be 0
self.assertNotEqual(v, 0)
# unspecified_kvno means we don't know the kvno,
# but want to enforce its presence
if value is not self.unspecified_kvno:
value = int(value)
self.assertNotEqual(value, 0)
self.assertEqual(v, value)
else:
self.assertIsNone(v)
def get_KerberosTimeWithUsec(self, epoch=None, offset=None):
if epoch is None:
epoch = time.time()
if offset is not None:
epoch = epoch + int(offset)
dt = datetime.datetime.fromtimestamp(epoch, tz=datetime.timezone.utc)
return (dt.strftime("%Y%m%d%H%M%SZ"), dt.microsecond)
def get_KerberosTime(self, epoch=None, offset=None):
(s, _) = self.get_KerberosTimeWithUsec(epoch=epoch, offset=offset)
return s
def get_EpochFromKerberosTime(self, kerberos_time):
if isinstance(kerberos_time, bytes):
kerberos_time = kerberos_time.decode()
epoch = datetime.datetime.strptime(kerberos_time,
'%Y%m%d%H%M%SZ')
epoch = epoch.replace(tzinfo=datetime.timezone.utc)
epoch = int(epoch.timestamp())
return epoch
def get_Nonce(self):
nonce_min = 0x7f000000
nonce_max = 0x7fffffff
v = random.randint(nonce_min, nonce_max)
return v
def get_pa_dict(self, pa_data):
pa_dict = {}
if pa_data is not None:
for pa in pa_data:
pa_type = pa['padata-type']
if pa_type in pa_dict:
raise RuntimeError(f'Duplicate type {pa_type}')
pa_dict[pa_type] = pa['padata-value']
return pa_dict
def SessionKey_create(self, etype, contents, kvno=None):
key = kcrypto.Key(etype, contents)
return Krb5EncryptionKey(key, kvno)
def PasswordKey_create(self, etype=None, pwd=None, salt=None, kvno=None):
self.assertIsNotNone(pwd)
self.assertIsNotNone(salt)
key = kcrypto.string_to_key(etype, pwd, salt)
return Krb5EncryptionKey(key, kvno)
def PasswordKey_from_etype_info2(self, creds, etype_info2, kvno=None):
e = etype_info2['etype']
salt = etype_info2.get('salt', None)
if e == kcrypto.Enctype.RC4:
nthash = creds.get_nt_hash()
return self.SessionKey_create(etype=e, contents=nthash, kvno=kvno)
password = creds.get_password()
return self.PasswordKey_create(
etype=e, pwd=password, salt=salt, kvno=kvno)
def TicketDecryptionKey_from_creds(self, creds, etype=None):
if etype is None:
etypes = creds.get_tgs_krb5_etypes()
etype = etypes[0]
forced_key = creds.get_forced_key(etype)
if forced_key is not None:
return forced_key
kvno = creds.get_kvno()
fail_msg = ("%s has no fixed key for etype[%s] kvno[%s] "
"nor a password specified, " % (
creds.get_username(), etype, kvno))
if etype == kcrypto.Enctype.RC4:
nthash = creds.get_nt_hash()
self.assertIsNotNone(nthash, msg=fail_msg)
return self.SessionKey_create(etype=etype,
contents=nthash,
kvno=kvno)
password = creds.get_password()
self.assertIsNotNone(password, msg=fail_msg)
salt = creds.get_salt()
return self.PasswordKey_create(etype=etype,
pwd=password,
salt=salt,
kvno=kvno)
def RandomKey(self, etype):
e = kcrypto._get_enctype_profile(etype)
contents = samba.generate_random_bytes(e.keysize)
return self.SessionKey_create(etype=etype, contents=contents)
def EncryptionKey_import(self, EncryptionKey_obj):
return self.SessionKey_create(EncryptionKey_obj['keytype'],
EncryptionKey_obj['keyvalue'])
def EncryptedData_create(self, key, usage, plaintext):
# EncryptedData ::= SEQUENCE {
# etype [0] Int32 -- EncryptionType --,
# kvno [1] UInt32 OPTIONAL,
# cipher [2] OCTET STRING -- ciphertext
# }
ciphertext = key.encrypt(usage, plaintext)
EncryptedData_obj = {
'etype': key.etype,
'cipher': ciphertext
}
if key.kvno is not None:
EncryptedData_obj['kvno'] = key.kvno
return EncryptedData_obj
def Checksum_create(self, key, usage, plaintext, ctype=None):
# Checksum ::= SEQUENCE {
# cksumtype [0] Int32,
# checksum [1] OCTET STRING
# }
if ctype is None:
ctype = key.ctype
checksum = key.make_checksum(usage, plaintext, ctype=ctype)
Checksum_obj = {
'cksumtype': ctype,
'checksum': checksum,
}
return Checksum_obj
@classmethod
def PrincipalName_create(cls, name_type, names):
# PrincipalName ::= SEQUENCE {
# name-type [0] Int32,
# name-string [1] SEQUENCE OF KerberosString
# }
PrincipalName_obj = {
'name-type': name_type,
'name-string': names,
}
return PrincipalName_obj
def AuthorizationData_create(self, ad_type, ad_data):
# AuthorizationData ::= SEQUENCE {
# ad-type [0] Int32,
# ad-data [1] OCTET STRING
# }
AUTH_DATA_obj = {
'ad-type': ad_type,
'ad-data': ad_data
}
return AUTH_DATA_obj
def PA_DATA_create(self, padata_type, padata_value):
# PA-DATA ::= SEQUENCE {
# -- NOTE: first tag is [1], not [0]
# padata-type [1] Int32,
# padata-value [2] OCTET STRING -- might be encoded AP-REQ
# }
PA_DATA_obj = {
'padata-type': padata_type,
'padata-value': padata_value,
}
return PA_DATA_obj
def PA_ENC_TS_ENC_create(self, ts, usec):
# PA-ENC-TS-ENC ::= SEQUENCE {
# patimestamp[0] KerberosTime, -- client's time
# pausec[1] krb5int32 OPTIONAL
# }
PA_ENC_TS_ENC_obj = {
'patimestamp': ts,
'pausec': usec,
}
return PA_ENC_TS_ENC_obj
def PA_PAC_OPTIONS_create(self, options):
# PA-PAC-OPTIONS ::= SEQUENCE {
# options [0] PACOptionFlags
# }
PA_PAC_OPTIONS_obj = {
'options': options
}
return PA_PAC_OPTIONS_obj
def KRB_FAST_ARMOR_create(self, armor_type, armor_value):
# KrbFastArmor ::= SEQUENCE {
# armor-type [0] Int32,
# armor-value [1] OCTET STRING,
# ...
# }
KRB_FAST_ARMOR_obj = {
'armor-type': armor_type,
'armor-value': armor_value
}
return KRB_FAST_ARMOR_obj
def KRB_FAST_REQ_create(self, fast_options, padata, req_body):
# KrbFastReq ::= SEQUENCE {
# fast-options [0] FastOptions,
# padata [1] SEQUENCE OF PA-DATA,
# req-body [2] KDC-REQ-BODY,
# ...
# }
KRB_FAST_REQ_obj = {
'fast-options': fast_options,
'padata': padata,
'req-body': req_body
}
return KRB_FAST_REQ_obj
def KRB_FAST_ARMORED_REQ_create(self, armor, req_checksum, enc_fast_req):
# KrbFastArmoredReq ::= SEQUENCE {
# armor [0] KrbFastArmor OPTIONAL,
# req-checksum [1] Checksum,
# enc-fast-req [2] EncryptedData -- KrbFastReq --
# }
KRB_FAST_ARMORED_REQ_obj = {
'req-checksum': req_checksum,
'enc-fast-req': enc_fast_req
}
if armor is not None:
KRB_FAST_ARMORED_REQ_obj['armor'] = armor
return KRB_FAST_ARMORED_REQ_obj
def PA_FX_FAST_REQUEST_create(self, armored_data):
# PA-FX-FAST-REQUEST ::= CHOICE {
# armored-data [0] KrbFastArmoredReq,
# ...
# }
PA_FX_FAST_REQUEST_obj = {
'armored-data': armored_data
}
return PA_FX_FAST_REQUEST_obj
def KERB_PA_PAC_REQUEST_create(self, include_pac, pa_data_create=True):
# KERB-PA-PAC-REQUEST ::= SEQUENCE {
# include-pac[0] BOOLEAN --If TRUE, and no pac present,
# -- include PAC.
# --If FALSE, and PAC present,
# -- remove PAC.
# }
KERB_PA_PAC_REQUEST_obj = {
'include-pac': include_pac,
}
if not pa_data_create:
return KERB_PA_PAC_REQUEST_obj
pa_pac = self.der_encode(KERB_PA_PAC_REQUEST_obj,
asn1Spec=krb5_asn1.KERB_PA_PAC_REQUEST())
pa_data = self.PA_DATA_create(PADATA_PAC_REQUEST, pa_pac)
return pa_data
def KDC_REQ_BODY_create(self,
kdc_options,
cname,
realm,
sname,
from_time,
till_time,
renew_time,
nonce,
etypes,
addresses,
additional_tickets,
EncAuthorizationData,
EncAuthorizationData_key,
EncAuthorizationData_usage,
asn1_print=None,
hexdump=None):
# KDC-REQ-BODY ::= SEQUENCE {
# kdc-options [0] KDCOptions,
# cname [1] PrincipalName OPTIONAL
# -- Used only in AS-REQ --,
# realm [2] Realm
# -- Server's realm
# -- Also client's in AS-REQ --,
# sname [3] PrincipalName OPTIONAL,
# from [4] KerberosTime OPTIONAL,
# till [5] KerberosTime,
# rtime [6] KerberosTime OPTIONAL,
# nonce [7] UInt32,
# etype [8] SEQUENCE OF Int32
# -- EncryptionType
# -- in preference order --,
# addresses [9] HostAddresses OPTIONAL,
# enc-authorization-data [10] EncryptedData OPTIONAL
# -- AuthorizationData --,
# additional-tickets [11] SEQUENCE OF Ticket OPTIONAL
# -- NOTE: not empty
# }
if EncAuthorizationData is not None:
enc_ad_plain = self.der_encode(
EncAuthorizationData,
asn1Spec=krb5_asn1.AuthorizationData(),
asn1_print=asn1_print,
hexdump=hexdump)
enc_ad = self.EncryptedData_create(EncAuthorizationData_key,
EncAuthorizationData_usage,
enc_ad_plain)
else:
enc_ad = None
KDC_REQ_BODY_obj = {
'kdc-options': kdc_options,
'realm': realm,
'till': till_time,
'nonce': nonce,
'etype': etypes,
}
if cname is not None:
KDC_REQ_BODY_obj['cname'] = cname
if sname is not None:
KDC_REQ_BODY_obj['sname'] = sname
if from_time is not None:
KDC_REQ_BODY_obj['from'] = from_time
if renew_time is not None:
KDC_REQ_BODY_obj['rtime'] = renew_time
if addresses is not None:
KDC_REQ_BODY_obj['addresses'] = addresses
if enc_ad is not None:
KDC_REQ_BODY_obj['enc-authorization-data'] = enc_ad
if additional_tickets is not None:
KDC_REQ_BODY_obj['additional-tickets'] = additional_tickets
return KDC_REQ_BODY_obj
def KDC_REQ_create(self,
msg_type,
padata,
req_body,
asn1Spec=None,
asn1_print=None,
hexdump=None):
# KDC-REQ ::= SEQUENCE {
# -- NOTE: first tag is [1], not [0]
# pvno [1] INTEGER (5) ,
# msg-type [2] INTEGER (10 -- AS -- | 12 -- TGS --),
# padata [3] SEQUENCE OF PA-DATA OPTIONAL
# -- NOTE: not empty --,
# req-body [4] KDC-REQ-BODY
# }
#
KDC_REQ_obj = {
'pvno': 5,
'msg-type': msg_type,
'req-body': req_body,
}
if padata is not None:
KDC_REQ_obj['padata'] = padata
if asn1Spec is not None:
KDC_REQ_decoded = pyasn1_native_decode(
KDC_REQ_obj, asn1Spec=asn1Spec)
else:
KDC_REQ_decoded = None
return KDC_REQ_obj, KDC_REQ_decoded
def AS_REQ_create(self,
padata, # optional
kdc_options, # required
cname, # optional
realm, # required
sname, # optional
from_time, # optional
till_time, # required
renew_time, # optional
nonce, # required
etypes, # required
addresses, # optional
additional_tickets,
native_decoded_only=True,
asn1_print=None,
hexdump=None):
# KDC-REQ ::= SEQUENCE {
# -- NOTE: first tag is [1], not [0]
# pvno [1] INTEGER (5) ,
# msg-type [2] INTEGER (10 -- AS -- | 12 -- TGS --),
# padata [3] SEQUENCE OF PA-DATA OPTIONAL
# -- NOTE: not empty --,
# req-body [4] KDC-REQ-BODY
# }
#
# KDC-REQ-BODY ::= SEQUENCE {
# kdc-options [0] KDCOptions,
# cname [1] PrincipalName OPTIONAL
# -- Used only in AS-REQ --,
# realm [2] Realm
# -- Server's realm
# -- Also client's in AS-REQ --,
# sname [3] PrincipalName OPTIONAL,
# from [4] KerberosTime OPTIONAL,
# till [5] KerberosTime,
# rtime [6] KerberosTime OPTIONAL,
# nonce [7] UInt32,
# etype [8] SEQUENCE OF Int32
# -- EncryptionType
# -- in preference order --,
# addresses [9] HostAddresses OPTIONAL,
# enc-authorization-data [10] EncryptedData OPTIONAL
# -- AuthorizationData --,
# additional-tickets [11] SEQUENCE OF Ticket OPTIONAL
# -- NOTE: not empty
# }
KDC_REQ_BODY_obj = self.KDC_REQ_BODY_create(
kdc_options,
cname,
realm,
sname,
from_time,
till_time,
renew_time,
nonce,
etypes,
addresses,
additional_tickets,
EncAuthorizationData=None,
EncAuthorizationData_key=None,
EncAuthorizationData_usage=None,
asn1_print=asn1_print,
hexdump=hexdump)
obj, decoded = self.KDC_REQ_create(
msg_type=KRB_AS_REQ,
padata=padata,
req_body=KDC_REQ_BODY_obj,
asn1Spec=krb5_asn1.AS_REQ(),
asn1_print=asn1_print,
hexdump=hexdump)
if native_decoded_only:
return decoded
return decoded, obj
def AP_REQ_create(self, ap_options, ticket, authenticator):
# AP-REQ ::= [APPLICATION 14] SEQUENCE {
# pvno [0] INTEGER (5),
# msg-type [1] INTEGER (14),
# ap-options [2] APOptions,
# ticket [3] Ticket,
# authenticator [4] EncryptedData -- Authenticator
# }
AP_REQ_obj = {
'pvno': 5,
'msg-type': KRB_AP_REQ,
'ap-options': ap_options,
'ticket': ticket,
'authenticator': authenticator,
}
return AP_REQ_obj
def Authenticator_create(
self, crealm, cname, cksum, cusec, ctime, subkey, seq_number,
authorization_data):
# -- Unencrypted authenticator
# Authenticator ::= [APPLICATION 2] SEQUENCE {
# authenticator-vno [0] INTEGER (5),
# crealm [1] Realm,
# cname [2] PrincipalName,
# cksum [3] Checksum OPTIONAL,
# cusec [4] Microseconds,
# ctime [5] KerberosTime,
# subkey [6] EncryptionKey OPTIONAL,
# seq-number [7] UInt32 OPTIONAL,
# authorization-data [8] AuthorizationData OPTIONAL
# }
Authenticator_obj = {
'authenticator-vno': 5,
'crealm': crealm,
'cname': cname,
'cusec': cusec,
'ctime': ctime,
}
if cksum is not None:
Authenticator_obj['cksum'] = cksum
if subkey is not None:
Authenticator_obj['subkey'] = subkey
if seq_number is not None:
Authenticator_obj['seq-number'] = seq_number
if authorization_data is not None:
Authenticator_obj['authorization-data'] = authorization_data
return Authenticator_obj
def TGS_REQ_create(self,
padata, # optional
cusec,
ctime,
ticket,
kdc_options, # required
cname, # optional
realm, # required
sname, # optional
from_time, # optional
till_time, # required
renew_time, # optional
nonce, # required
etypes, # required
addresses, # optional
EncAuthorizationData,
EncAuthorizationData_key,
additional_tickets,
ticket_session_key,
authenticator_subkey=None,
body_checksum_type=None,
native_decoded_only=True,
asn1_print=None,
hexdump=None):
# KDC-REQ ::= SEQUENCE {
# -- NOTE: first tag is [1], not [0]
# pvno [1] INTEGER (5) ,
# msg-type [2] INTEGER (10 -- AS -- | 12 -- TGS --),
# padata [3] SEQUENCE OF PA-DATA OPTIONAL
# -- NOTE: not empty --,
# req-body [4] KDC-REQ-BODY
# }
#
# KDC-REQ-BODY ::= SEQUENCE {
# kdc-options [0] KDCOptions,
# cname [1] PrincipalName OPTIONAL
# -- Used only in AS-REQ --,
# realm [2] Realm
# -- Server's realm
# -- Also client's in AS-REQ --,
# sname [3] PrincipalName OPTIONAL,
# from [4] KerberosTime OPTIONAL,
# till [5] KerberosTime,
# rtime [6] KerberosTime OPTIONAL,
# nonce [7] UInt32,
# etype [8] SEQUENCE OF Int32
# -- EncryptionType
# -- in preference order --,
# addresses [9] HostAddresses OPTIONAL,
# enc-authorization-data [10] EncryptedData OPTIONAL
# -- AuthorizationData --,
# additional-tickets [11] SEQUENCE OF Ticket OPTIONAL
# -- NOTE: not empty
# }
if authenticator_subkey is not None:
EncAuthorizationData_usage = KU_TGS_REQ_AUTH_DAT_SUBKEY
else:
EncAuthorizationData_usage = KU_TGS_REQ_AUTH_DAT_SESSION
req_body = self.KDC_REQ_BODY_create(
kdc_options=kdc_options,
cname=None,
realm=realm,
sname=sname,
from_time=from_time,
till_time=till_time,
renew_time=renew_time,
nonce=nonce,
etypes=etypes,
addresses=addresses,
additional_tickets=additional_tickets,
EncAuthorizationData=EncAuthorizationData,
EncAuthorizationData_key=EncAuthorizationData_key,
EncAuthorizationData_usage=EncAuthorizationData_usage)
req_body_blob = self.der_encode(req_body,
asn1Spec=krb5_asn1.KDC_REQ_BODY(),
asn1_print=asn1_print, hexdump=hexdump)
req_body_checksum = self.Checksum_create(ticket_session_key,
KU_TGS_REQ_AUTH_CKSUM,
req_body_blob,
ctype=body_checksum_type)
subkey_obj = None
if authenticator_subkey is not None:
subkey_obj = authenticator_subkey.export_obj()
seq_number = random.randint(0, 0xfffffffe)
authenticator = self.Authenticator_create(
crealm=realm,
cname=cname,
cksum=req_body_checksum,
cusec=cusec,
ctime=ctime,
subkey=subkey_obj,
seq_number=seq_number,
authorization_data=None)
authenticator = self.der_encode(
authenticator,
asn1Spec=krb5_asn1.Authenticator(),
asn1_print=asn1_print,
hexdump=hexdump)
authenticator = self.EncryptedData_create(
ticket_session_key, KU_TGS_REQ_AUTH, authenticator)
ap_options = krb5_asn1.APOptions('0')
ap_req = self.AP_REQ_create(ap_options=str(ap_options),
ticket=ticket,
authenticator=authenticator)
ap_req = self.der_encode(ap_req, asn1Spec=krb5_asn1.AP_REQ(),
asn1_print=asn1_print, hexdump=hexdump)
pa_tgs_req = self.PA_DATA_create(PADATA_KDC_REQ, ap_req)
if padata is not None:
padata.append(pa_tgs_req)
else:
padata = [pa_tgs_req]
obj, decoded = self.KDC_REQ_create(
msg_type=KRB_TGS_REQ,
padata=padata,
req_body=req_body,
asn1Spec=krb5_asn1.TGS_REQ(),
asn1_print=asn1_print,
hexdump=hexdump)
if native_decoded_only:
return decoded
return decoded, obj
def PA_S4U2Self_create(self, name, realm, tgt_session_key, ctype=None):
# PA-S4U2Self ::= SEQUENCE {
# name [0] PrincipalName,
# realm [1] Realm,
# cksum [2] Checksum,
# auth [3] GeneralString
# }
cksum_data = name['name-type'].to_bytes(4, byteorder='little')
for n in name['name-string']:
cksum_data += n.encode()
cksum_data += realm.encode()
cksum_data += "Kerberos".encode()
cksum = self.Checksum_create(tgt_session_key,
KU_NON_KERB_CKSUM_SALT,
cksum_data,
ctype)
PA_S4U2Self_obj = {
'name': name,
'realm': realm,
'cksum': cksum,
'auth': "Kerberos",
}
pa_s4u2self = self.der_encode(
PA_S4U2Self_obj, asn1Spec=krb5_asn1.PA_S4U2Self())
return self.PA_DATA_create(PADATA_FOR_USER, pa_s4u2self)
def _generic_kdc_exchange(self,
kdc_exchange_dict, # required
cname=None, # optional
realm=None, # required
sname=None, # optional
from_time=None, # optional
till_time=None, # required
renew_time=None, # optional
etypes=None, # required
addresses=None, # optional
additional_tickets=None, # optional
EncAuthorizationData=None, # optional
EncAuthorizationData_key=None, # optional
EncAuthorizationData_usage=None): # optional
check_error_fn = kdc_exchange_dict['check_error_fn']
check_rep_fn = kdc_exchange_dict['check_rep_fn']
generate_padata_fn = kdc_exchange_dict['generate_padata_fn']
callback_dict = kdc_exchange_dict['callback_dict']
req_msg_type = kdc_exchange_dict['req_msg_type']
req_asn1Spec = kdc_exchange_dict['req_asn1Spec']
rep_msg_type = kdc_exchange_dict['rep_msg_type']
expected_error_mode = kdc_exchange_dict['expected_error_mode']
kdc_options = kdc_exchange_dict['kdc_options']
if till_time is None:
till_time = self.get_KerberosTime(offset=36000)
if 'nonce' in kdc_exchange_dict:
nonce = kdc_exchange_dict['nonce']
else:
nonce = self.get_Nonce()
kdc_exchange_dict['nonce'] = nonce
req_body = self.KDC_REQ_BODY_create(
kdc_options=kdc_options,
cname=cname,
realm=realm,
sname=sname,
from_time=from_time,
till_time=till_time,
renew_time=renew_time,
nonce=nonce,
etypes=etypes,
addresses=addresses,
additional_tickets=additional_tickets,
EncAuthorizationData=EncAuthorizationData,
EncAuthorizationData_key=EncAuthorizationData_key,
EncAuthorizationData_usage=EncAuthorizationData_usage)
if req_msg_type == KRB_AS_REQ:
tgs_req = None
tgs_req_padata = None
else:
self.assertEqual(KRB_TGS_REQ, req_msg_type)
tgs_req = self.generate_ap_req(kdc_exchange_dict,
callback_dict,
req_body,
armor=False)
tgs_req_padata = self.PA_DATA_create(PADATA_KDC_REQ, tgs_req)
if generate_padata_fn is not None:
# This can alter req_body...
padata, req_body = generate_padata_fn(kdc_exchange_dict,
callback_dict,
req_body)
self.assertIsNotNone(padata)
self.assertNotIn(PADATA_KDC_REQ,
[pa['padata-type'] for pa in padata],
'Don\'t create TGS-REQ manually')
else:
padata = []
if tgs_req_padata is not None:
padata.insert(0, tgs_req_padata)
if not padata:
padata = None
kdc_exchange_dict['req_padata'] = padata
kdc_exchange_dict['req_body'] = req_body
req_obj, req_decoded = self.KDC_REQ_create(msg_type=req_msg_type,
padata=padata,
req_body=req_body,
asn1Spec=req_asn1Spec())
rep = self.send_recv_transaction(req_decoded)
self.assertIsNotNone(rep)
msg_type = self.getElementValue(rep, 'msg-type')
self.assertIsNotNone(msg_type)
expected_msg_type = None
if check_error_fn is not None:
expected_msg_type = KRB_ERROR
self.assertIsNone(check_rep_fn)
self.assertNotEqual(0, expected_error_mode)
if check_rep_fn is not None:
expected_msg_type = rep_msg_type
self.assertIsNone(check_error_fn)
self.assertEqual(0, expected_error_mode)
self.assertIsNotNone(expected_msg_type)
self.assertEqual(msg_type, expected_msg_type)
if msg_type == KRB_ERROR:
return check_error_fn(kdc_exchange_dict,
callback_dict,
rep)
return check_rep_fn(kdc_exchange_dict, callback_dict, rep)
def as_exchange_dict(self,
expected_crealm=None,
expected_cname=None,
expected_srealm=None,
expected_sname=None,
ticket_decryption_key=None,
generate_padata_fn=None,
check_error_fn=None,
check_rep_fn=None,
check_padata_fn=None,
check_kdc_private_fn=None,
callback_dict=None,
expected_error_mode=0,
client_as_etypes=None,
expected_salt=None,
authenticator_subkey=None,
armor_tgt=None,
armor_subkey=None,
kdc_options=''):
kdc_exchange_dict = {
'req_msg_type': KRB_AS_REQ,
'req_asn1Spec': krb5_asn1.AS_REQ,
'rep_msg_type': KRB_AS_REP,
'rep_asn1Spec': krb5_asn1.AS_REP,
'rep_encpart_asn1Spec': krb5_asn1.EncASRepPart,
'expected_crealm': expected_crealm,
'expected_cname': expected_cname,
'expected_srealm': expected_srealm,
'expected_sname': expected_sname,
'ticket_decryption_key': ticket_decryption_key,
'generate_padata_fn': generate_padata_fn,
'check_error_fn': check_error_fn,
'check_rep_fn': check_rep_fn,
'check_padata_fn': check_padata_fn,
'check_kdc_private_fn': check_kdc_private_fn,
'callback_dict': callback_dict,
'expected_error_mode': expected_error_mode,
'client_as_etypes': client_as_etypes,
'expected_salt': expected_salt,
'authenticator_subkey': authenticator_subkey,
'armor_tgt': armor_tgt,
'armor_subkey': armor_subkey,
'kdc_options': kdc_options,
}
if callback_dict is None:
callback_dict = {}
return kdc_exchange_dict
def tgs_exchange_dict(self,
expected_crealm=None,
expected_cname=None,
expected_srealm=None,
expected_sname=None,
ticket_decryption_key=None,
generate_padata_fn=None,
check_error_fn=None,
check_rep_fn=None,
check_padata_fn=None,
check_kdc_private_fn=None,
callback_dict=None,
tgt=None,
armor_tgt=None,
armor_subkey=None,
authenticator_subkey=None,
body_checksum_type=None,
kdc_options=''):
kdc_exchange_dict = {
'req_msg_type': KRB_TGS_REQ,
'req_asn1Spec': krb5_asn1.TGS_REQ,
'rep_msg_type': KRB_TGS_REP,
'rep_asn1Spec': krb5_asn1.TGS_REP,
'rep_encpart_asn1Spec': krb5_asn1.EncTGSRepPart,
'expected_crealm': expected_crealm,
'expected_cname': expected_cname,
'expected_srealm': expected_srealm,
'expected_sname': expected_sname,
'ticket_decryption_key': ticket_decryption_key,
'generate_padata_fn': generate_padata_fn,
'check_error_fn': check_error_fn,
'check_rep_fn': check_rep_fn,
'check_padata_fn': check_padata_fn,
'check_kdc_private_fn': check_kdc_private_fn,
'callback_dict': callback_dict,
'tgt': tgt,
'body_checksum_type': body_checksum_type,
'armor_tgt': armor_tgt,
'armor_subkey': armor_subkey,
'authenticator_subkey': authenticator_subkey,
'kdc_options': kdc_options
}
if callback_dict is None:
callback_dict = {}
return kdc_exchange_dict
def generic_check_kdc_rep(self,
kdc_exchange_dict,
callback_dict,
rep):
expected_crealm = kdc_exchange_dict['expected_crealm']
expected_cname = kdc_exchange_dict['expected_cname']
expected_srealm = kdc_exchange_dict['expected_srealm']
expected_sname = kdc_exchange_dict['expected_sname']
ticket_decryption_key = kdc_exchange_dict['ticket_decryption_key']
check_padata_fn = kdc_exchange_dict['check_padata_fn']
check_kdc_private_fn = kdc_exchange_dict['check_kdc_private_fn']
rep_encpart_asn1Spec = kdc_exchange_dict['rep_encpart_asn1Spec']
msg_type = kdc_exchange_dict['rep_msg_type']
self.assertElementEqual(rep, 'msg-type', msg_type) # AS-REP | TGS-REP
padata = self.getElementValue(rep, 'padata')
if self.strict_checking:
self.assertElementEqualUTF8(rep, 'crealm', expected_crealm)
self.assertElementEqualPrincipal(rep, 'cname', expected_cname)
self.assertElementPresent(rep, 'ticket')
ticket = self.getElementValue(rep, 'ticket')
ticket_encpart = None
ticket_cipher = None
self.assertIsNotNone(ticket)
if ticket is not None: # Never None, but gives indentation
self.assertElementEqual(ticket, 'tkt-vno', 5)
self.assertElementEqualUTF8(ticket, 'realm', expected_srealm)
self.assertElementEqualPrincipal(ticket, 'sname', expected_sname)
self.assertElementPresent(ticket, 'enc-part')
ticket_encpart = self.getElementValue(ticket, 'enc-part')
self.assertIsNotNone(ticket_encpart)
if ticket_encpart is not None: # Never None, but gives indentation
self.assertElementPresent(ticket_encpart, 'etype')
# 'unspecified' means present, with any value != 0
self.assertElementKVNO(ticket_encpart, 'kvno',
self.unspecified_kvno)
self.assertElementPresent(ticket_encpart, 'cipher')
ticket_cipher = self.getElementValue(ticket_encpart, 'cipher')
self.assertElementPresent(rep, 'enc-part')
encpart = self.getElementValue(rep, 'enc-part')
encpart_cipher = None
self.assertIsNotNone(encpart)
if encpart is not None: # Never None, but gives indentation
self.assertElementPresent(encpart, 'etype')
self.assertElementKVNO(ticket_encpart, 'kvno', 'autodetect')
self.assertElementPresent(encpart, 'cipher')
encpart_cipher = self.getElementValue(encpart, 'cipher')
encpart_decryption_key = None
self.assertIsNotNone(check_padata_fn)
if check_padata_fn is not None:
# See if we can get the decryption key from the preauth phase
encpart_decryption_key, encpart_decryption_usage = (
check_padata_fn(kdc_exchange_dict, callback_dict,
rep, padata))
ticket_private = None
self.assertIsNotNone(ticket_decryption_key)
if ticket_decryption_key is not None:
self.assertElementEqual(ticket_encpart, 'etype',
ticket_decryption_key.etype)
self.assertElementKVNO(ticket_encpart, 'kvno',
ticket_decryption_key.kvno)
ticket_decpart = ticket_decryption_key.decrypt(KU_TICKET,
ticket_cipher)
ticket_private = self.der_decode(
ticket_decpart,
asn1Spec=krb5_asn1.EncTicketPart())
encpart_private = None
self.assertIsNotNone(encpart_decryption_key)
if encpart_decryption_key is not None:
self.assertElementEqual(encpart, 'etype',
encpart_decryption_key.etype)
if self.strict_checking:
self.assertElementKVNO(encpart, 'kvno',
encpart_decryption_key.kvno)
rep_decpart = encpart_decryption_key.decrypt(
encpart_decryption_usage,
encpart_cipher)
# MIT KDC encodes both EncASRepPart and EncTGSRepPart with
# application tag 26
try:
encpart_private = self.der_decode(
rep_decpart,
asn1Spec=rep_encpart_asn1Spec())
except Exception:
encpart_private = self.der_decode(
rep_decpart,
asn1Spec=krb5_asn1.EncTGSRepPart())
self.assertIsNotNone(check_kdc_private_fn)
if check_kdc_private_fn is not None:
check_kdc_private_fn(kdc_exchange_dict, callback_dict,
rep, ticket_private, encpart_private)
return rep
def generic_check_kdc_private(self,
kdc_exchange_dict,
callback_dict,
rep,
ticket_private,
encpart_private):
expected_crealm = kdc_exchange_dict['expected_crealm']
expected_cname = kdc_exchange_dict['expected_cname']
expected_srealm = kdc_exchange_dict['expected_srealm']
expected_sname = kdc_exchange_dict['expected_sname']
ticket_decryption_key = kdc_exchange_dict['ticket_decryption_key']
ticket = self.getElementValue(rep, 'ticket')
ticket_session_key = None
if ticket_private is not None:
self.assertElementPresent(ticket_private, 'flags')
self.assertElementPresent(ticket_private, 'key')
ticket_key = self.getElementValue(ticket_private, 'key')
self.assertIsNotNone(ticket_key)
if ticket_key is not None: # Never None, but gives indentation
self.assertElementPresent(ticket_key, 'keytype')
self.assertElementPresent(ticket_key, 'keyvalue')
ticket_session_key = self.EncryptionKey_import(ticket_key)
self.assertElementEqualUTF8(ticket_private, 'crealm',
expected_crealm)
self.assertElementEqualPrincipal(ticket_private, 'cname',
expected_cname)
self.assertElementPresent(ticket_private, 'transited')
self.assertElementPresent(ticket_private, 'authtime')
if self.strict_checking:
self.assertElementPresent(ticket_private, 'starttime')
self.assertElementPresent(ticket_private, 'endtime')
# TODO self.assertElementPresent(ticket_private, 'renew-till')
# TODO self.assertElementMissing(ticket_private, 'caddr')
self.assertElementPresent(ticket_private, 'authorization-data')
encpart_session_key = None
if encpart_private is not None:
self.assertElementPresent(encpart_private, 'key')
encpart_key = self.getElementValue(encpart_private, 'key')
self.assertIsNotNone(encpart_key)
if encpart_key is not None: # Never None, but gives indentation
self.assertElementPresent(encpart_key, 'keytype')
self.assertElementPresent(encpart_key, 'keyvalue')
encpart_session_key = self.EncryptionKey_import(encpart_key)
self.assertElementPresent(encpart_private, 'last-req')
self.assertElementEqual(encpart_private, 'nonce',
kdc_exchange_dict['nonce'])
# TODO self.assertElementPresent(encpart_private,
# 'key-expiration')
self.assertElementPresent(encpart_private, 'flags')
self.assertElementPresent(encpart_private, 'authtime')
if self.strict_checking:
self.assertElementPresent(encpart_private, 'starttime')
self.assertElementPresent(encpart_private, 'endtime')
# TODO self.assertElementPresent(encpart_private, 'renew-till')
self.assertElementEqualUTF8(encpart_private, 'srealm',
expected_srealm)
self.assertElementEqualPrincipal(encpart_private, 'sname',
expected_sname)
# TODO self.assertElementMissing(encpart_private, 'caddr')
if ticket_session_key is not None and encpart_session_key is not None:
self.assertEqual(ticket_session_key.etype,
encpart_session_key.etype)
self.assertEqual(ticket_session_key.key.contents,
encpart_session_key.key.contents)
if encpart_session_key is not None:
session_key = encpart_session_key
else:
session_key = ticket_session_key
ticket_creds = KerberosTicketCreds(
ticket,
session_key,
crealm=expected_crealm,
cname=expected_cname,
srealm=expected_srealm,
sname=expected_sname,
decryption_key=ticket_decryption_key,
ticket_private=ticket_private,
encpart_private=encpart_private)
kdc_exchange_dict['rep_ticket_creds'] = ticket_creds
def generic_check_kdc_error(self,
kdc_exchange_dict,
callback_dict,
rep):
expected_crealm = kdc_exchange_dict['expected_crealm']
expected_cname = kdc_exchange_dict['expected_cname']
expected_srealm = kdc_exchange_dict['expected_srealm']
expected_sname = kdc_exchange_dict['expected_sname']
expected_salt = kdc_exchange_dict['expected_salt']
client_as_etypes = kdc_exchange_dict['client_as_etypes']
expected_error_mode = kdc_exchange_dict['expected_error_mode']
req_body = kdc_exchange_dict['req_body']
proposed_etypes = req_body['etype']
kdc_exchange_dict['preauth_etype_info2'] = None
expect_etype_info2 = ()
expect_etype_info = False
unexpect_etype_info = True
expected_aes_type = 0
expected_rc4_type = 0
if kcrypto.Enctype.RC4 in proposed_etypes:
expect_etype_info = True
for etype in proposed_etypes:
if etype in (kcrypto.Enctype.AES256, kcrypto.Enctype.AES128):
expect_etype_info = False
if etype not in client_as_etypes:
continue
if etype in (kcrypto.Enctype.AES256, kcrypto.Enctype.AES128):
if etype > expected_aes_type:
expected_aes_type = etype
if etype in (kcrypto.Enctype.RC4,):
unexpect_etype_info = False
if etype > expected_rc4_type:
expected_rc4_type = etype
if expected_aes_type != 0:
expect_etype_info2 += (expected_aes_type,)
if expected_rc4_type != 0:
expect_etype_info2 += (expected_rc4_type,)
expected_patypes = ()
if expect_etype_info:
self.assertGreater(len(expect_etype_info2), 0)
expected_patypes += (PADATA_ETYPE_INFO,)
if len(expect_etype_info2) != 0:
expected_patypes += (PADATA_ETYPE_INFO2,)
expected_patypes += (PADATA_ENC_TIMESTAMP,)
expected_patypes += (PADATA_PK_AS_REQ,)
expected_patypes += (PADATA_PK_AS_REP_19,)
self.assertElementEqual(rep, 'pvno', 5)
self.assertElementEqual(rep, 'msg-type', KRB_ERROR)
self.assertElementEqual(rep, 'error-code', expected_error_mode)
if self.strict_checking:
self.assertElementMissing(rep, 'ctime')
self.assertElementMissing(rep, 'cusec')
self.assertElementPresent(rep, 'stime')
self.assertElementPresent(rep, 'susec')
# error-code checked above
if self.strict_checking:
self.assertElementMissing(rep, 'crealm')
self.assertElementMissing(rep, 'cname')
self.assertElementEqualUTF8(rep, 'realm', expected_srealm)
self.assertElementEqualPrincipal(rep, 'sname', expected_sname)
self.assertElementMissing(rep, 'e-text')
if expected_error_mode == KDC_ERR_GENERIC:
self.assertElementMissing(rep, 'e-data')
return
edata = self.getElementValue(rep, 'e-data')
if self.strict_checking:
self.assertIsNotNone(edata)
if edata is not None:
rep_padata = self.der_decode(edata,
asn1Spec=krb5_asn1.METHOD_DATA())
self.assertGreater(len(rep_padata), 0)
else:
rep_padata = []
if self.strict_checking:
for i, patype in enumerate(expected_patypes):
self.assertElementEqual(rep_padata[i], 'padata-type', patype)
self.assertEqual(len(rep_padata), len(expected_patypes))
etype_info2 = None
etype_info = None
enc_timestamp = None
pk_as_req = None
pk_as_rep19 = None
for pa in rep_padata:
patype = self.getElementValue(pa, 'padata-type')
pavalue = self.getElementValue(pa, 'padata-value')
if patype == PADATA_ETYPE_INFO2:
self.assertIsNone(etype_info2)
etype_info2 = self.der_decode(pavalue,
asn1Spec=krb5_asn1.ETYPE_INFO2())
continue
if patype == PADATA_ETYPE_INFO:
self.assertIsNone(etype_info)
etype_info = self.der_decode(pavalue,
asn1Spec=krb5_asn1.ETYPE_INFO())
continue
if patype == PADATA_ENC_TIMESTAMP:
self.assertIsNone(enc_timestamp)
enc_timestamp = pavalue
self.assertEqual(len(enc_timestamp), 0)
continue
if patype == PADATA_PK_AS_REQ:
self.assertIsNone(pk_as_req)
pk_as_req = pavalue
self.assertEqual(len(pk_as_req), 0)
continue
if patype == PADATA_PK_AS_REP_19:
self.assertIsNone(pk_as_rep19)
pk_as_rep19 = pavalue
self.assertEqual(len(pk_as_rep19), 0)
continue
if all(etype not in client_as_etypes or etype not in proposed_etypes
for etype in (kcrypto.Enctype.AES256,
kcrypto.Enctype.AES128,
kcrypto.Enctype.RC4)):
self.assertIsNone(etype_info2)
self.assertIsNone(etype_info)
if self.strict_checking:
self.assertIsNotNone(enc_timestamp)
self.assertIsNotNone(pk_as_req)
self.assertIsNotNone(pk_as_rep19)
return
if self.strict_checking:
self.assertIsNotNone(etype_info2)
if expect_etype_info:
self.assertIsNotNone(etype_info)
else:
if self.strict_checking:
self.assertIsNone(etype_info)
if unexpect_etype_info:
self.assertIsNone(etype_info)
if self.strict_checking:
self.assertGreaterEqual(len(etype_info2), 1)
self.assertEqual(len(etype_info2), len(expect_etype_info2))
for i in range(0, len(etype_info2)):
e = self.getElementValue(etype_info2[i], 'etype')
self.assertEqual(e, expect_etype_info2[i])
salt = self.getElementValue(etype_info2[i], 'salt')
if e == kcrypto.Enctype.RC4:
self.assertIsNone(salt)
else:
self.assertIsNotNone(salt)
if expected_salt is not None:
self.assertEqual(salt, expected_salt)
s2kparams = self.getElementValue(etype_info2[i], 's2kparams')
if self.strict_checking:
self.assertIsNone(s2kparams)
if etype_info is not None:
self.assertEqual(len(etype_info), 1)
e = self.getElementValue(etype_info[0], 'etype')
self.assertEqual(e, kcrypto.Enctype.RC4)
self.assertEqual(e, expect_etype_info2[0])
salt = self.getElementValue(etype_info[0], 'salt')
if self.strict_checking:
self.assertIsNotNone(salt)
self.assertEqual(len(salt), 0)
self.assertIsNotNone(enc_timestamp)
self.assertIsNotNone(pk_as_req)
self.assertIsNotNone(pk_as_rep19)
kdc_exchange_dict['preauth_etype_info2'] = etype_info2
return
def generate_ap_req(self,
kdc_exchange_dict,
_callback_dict,
req_body,
armor):
if armor:
tgt = kdc_exchange_dict['armor_tgt']
authenticator_subkey = kdc_exchange_dict['armor_subkey']
req_body_checksum = None
else:
tgt = kdc_exchange_dict['tgt']
authenticator_subkey = kdc_exchange_dict['authenticator_subkey']
body_checksum_type = kdc_exchange_dict['body_checksum_type']
req_body_blob = self.der_encode(req_body,
asn1Spec=krb5_asn1.KDC_REQ_BODY())
req_body_checksum = self.Checksum_create(tgt.session_key,
KU_TGS_REQ_AUTH_CKSUM,
req_body_blob,
ctype=body_checksum_type)
subkey_obj = None
if authenticator_subkey is not None:
subkey_obj = authenticator_subkey.export_obj()
seq_number = random.randint(0, 0xfffffffe)
(ctime, cusec) = self.get_KerberosTimeWithUsec()
authenticator_obj = self.Authenticator_create(
crealm=tgt.crealm,
cname=tgt.cname,
cksum=req_body_checksum,
cusec=cusec,
ctime=ctime,
subkey=subkey_obj,
seq_number=seq_number,
authorization_data=None)
authenticator_blob = self.der_encode(
authenticator_obj,
asn1Spec=krb5_asn1.Authenticator())
usage = KU_AP_REQ_AUTH if armor else KU_TGS_REQ_AUTH
authenticator = self.EncryptedData_create(tgt.session_key,
usage,
authenticator_blob)
ap_options = krb5_asn1.APOptions('0')
ap_req_obj = self.AP_REQ_create(ap_options=str(ap_options),
ticket=tgt.ticket,
authenticator=authenticator)
ap_req = self.der_encode(ap_req_obj, asn1Spec=krb5_asn1.AP_REQ())
return ap_req
def generate_simple_tgs_padata(self,
kdc_exchange_dict,
callback_dict,
req_body):
ap_req = self.generate_ap_req(kdc_exchange_dict,
callback_dict,
req_body,
armor=False)
pa_tgs_req = self.PA_DATA_create(PADATA_KDC_REQ, ap_req)
padata = [pa_tgs_req]
return padata, req_body
def check_simple_tgs_padata(self,
kdc_exchange_dict,
callback_dict,
rep,
padata):
tgt = kdc_exchange_dict['tgt']
authenticator_subkey = kdc_exchange_dict['authenticator_subkey']
if authenticator_subkey is not None:
subkey = authenticator_subkey
subkey_usage = KU_TGS_REP_ENC_PART_SUB_KEY
else:
subkey = tgt.session_key
subkey_usage = KU_TGS_REP_ENC_PART_SESSION
return subkey, subkey_usage
def generate_armor_key(self, subkey, session_key):
armor_key = kcrypto.cf2(subkey.key,
session_key.key,
b'subkeyarmor',
b'ticketarmor')
armor_key = Krb5EncryptionKey(armor_key, None)
return armor_key
def generate_strengthen_reply_key(self, strengthen_key, reply_key):
strengthen_reply_key = kcrypto.cf2(strengthen_key.key,
reply_key.key,
b'strengthenkey',
b'replykey')
strengthen_reply_key = Krb5EncryptionKey(strengthen_reply_key,
reply_key.kvno)
return strengthen_reply_key
def generate_client_challenge_key(self, armor_key, longterm_key):
client_challenge_key = kcrypto.cf2(armor_key.key,
longterm_key.key,
b'clientchallengearmor',
b'challengelongterm')
client_challenge_key = Krb5EncryptionKey(client_challenge_key, None)
return client_challenge_key
def generate_kdc_challenge_key(self, armor_key, longterm_key):
kdc_challenge_key = kcrypto.cf2(armor_key.key,
longterm_key.key,
b'kdcchallengearmor',
b'challengelongterm')
kdc_challenge_key = Krb5EncryptionKey(kdc_challenge_key, None)
return kdc_challenge_key
def _test_as_exchange(self,
cname,
realm,
sname,
till,
client_as_etypes,
expected_error_mode,
expected_crealm,
expected_cname,
expected_srealm,
expected_sname,
expected_salt,
etypes,
padata,
kdc_options,
preauth_key=None,
ticket_decryption_key=None):
def _generate_padata_copy(_kdc_exchange_dict,
_callback_dict,
req_body):
return padata, req_body
def _check_padata_preauth_key(_kdc_exchange_dict,
_callback_dict,
rep,
padata):
as_rep_usage = KU_AS_REP_ENC_PART
return preauth_key, as_rep_usage
if expected_error_mode == 0:
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
if padata is not None:
generate_padata_fn = _generate_padata_copy
else:
generate_padata_fn = None
kdc_exchange_dict = self.as_exchange_dict(
expected_crealm=expected_crealm,
expected_cname=expected_cname,
expected_srealm=expected_srealm,
expected_sname=expected_sname,
ticket_decryption_key=ticket_decryption_key,
generate_padata_fn=generate_padata_fn,
check_error_fn=check_error_fn,
check_rep_fn=check_rep_fn,
check_padata_fn=_check_padata_preauth_key,
check_kdc_private_fn=self.generic_check_kdc_private,
expected_error_mode=expected_error_mode,
client_as_etypes=client_as_etypes,
expected_salt=expected_salt,
kdc_options=str(kdc_options))
rep = self._generic_kdc_exchange(kdc_exchange_dict,
cname=cname,
realm=realm,
sname=sname,
till_time=till,
etypes=etypes)
return rep, kdc_exchange_dict
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