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ee2ac2b8cc
This allows building the pre-authentication data that encodes the request for the KDC (or more likely a request not to include) the KRB5 PAC in the resulting ticket. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
1184 lines
43 KiB
Python
1184 lines
43 KiB
Python
# Unix SMB/CIFS implementation.
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# Copyright (C) Isaac Boukris 2020
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# Copyright (C) Stefan Metzmacher 2020
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import sys
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import socket
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import struct
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import time
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import datetime
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import random
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import binascii
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import samba.tests
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from samba.credentials import Credentials
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from samba.tests import TestCaseInTempDir
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from samba.dcerpc import security
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import samba.tests.krb5.rfc4120_pyasn1 as krb5_asn1
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import samba.tests.krb5.kcrypto as kcrypto
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from pyasn1.codec.der.decoder import decode as pyasn1_der_decode
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from pyasn1.codec.der.encoder import encode as pyasn1_der_encode
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from pyasn1.codec.native.decoder import decode as pyasn1_native_decode
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from pyasn1.codec.native.encoder import encode as pyasn1_native_encode
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from pyasn1.codec.ber.encoder import BitStringEncoder as BitStringEncoder
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def BitStringEncoder_encodeValue32(
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self, value, asn1Spec, encodeFun, **options):
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#
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# BitStrings like KDCOptions or TicketFlags should at least
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# be 32-Bit on the wire
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#
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if asn1Spec is not None:
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# TODO: try to avoid ASN.1 schema instantiation
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value = asn1Spec.clone(value)
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valueLength = len(value)
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if valueLength % 8:
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alignedValue = value << (8 - valueLength % 8)
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else:
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alignedValue = value
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substrate = alignedValue.asOctets()
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length = len(substrate)
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# We need at least 32-Bit / 4-Bytes
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if length < 4:
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padding = 4 - length
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else:
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padding = 0
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ret = b'\x00' + substrate + (b'\x00' * padding)
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return ret, False, True
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BitStringEncoder.encodeValue = BitStringEncoder_encodeValue32
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def BitString_NamedValues_prettyPrint(self, scope=0):
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ret = "%s" % self.asBinary()
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bits = []
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highest_bit = 32
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for byte in self.asNumbers():
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for bit in [7, 6, 5, 4, 3, 2, 1, 0]:
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mask = 1 << bit
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if byte & mask:
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val = 1
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else:
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val = 0
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bits.append(val)
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if len(bits) < highest_bit:
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for bitPosition in range(len(bits), highest_bit):
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bits.append(0)
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indent = " " * scope
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delim = ": (\n%s " % indent
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for bitPosition in range(highest_bit):
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if bitPosition in self.prettyPrintNamedValues:
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name = self.prettyPrintNamedValues[bitPosition]
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elif bits[bitPosition] != 0:
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name = "unknown-bit-%u" % bitPosition
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else:
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continue
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ret += "%s%s:%u" % (delim, name, bits[bitPosition])
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delim = ",\n%s " % indent
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ret += "\n%s)" % indent
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return ret
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krb5_asn1.TicketFlags.prettyPrintNamedValues =\
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krb5_asn1.TicketFlagsValues.namedValues
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krb5_asn1.TicketFlags.namedValues =\
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krb5_asn1.TicketFlagsValues.namedValues
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krb5_asn1.TicketFlags.prettyPrint =\
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BitString_NamedValues_prettyPrint
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krb5_asn1.KDCOptions.prettyPrintNamedValues =\
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krb5_asn1.KDCOptionsValues.namedValues
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krb5_asn1.KDCOptions.namedValues =\
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krb5_asn1.KDCOptionsValues.namedValues
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krb5_asn1.KDCOptions.prettyPrint =\
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BitString_NamedValues_prettyPrint
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krb5_asn1.APOptions.prettyPrintNamedValues =\
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krb5_asn1.APOptionsValues.namedValues
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krb5_asn1.APOptions.namedValues =\
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krb5_asn1.APOptionsValues.namedValues
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krb5_asn1.APOptions.prettyPrint =\
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BitString_NamedValues_prettyPrint
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krb5_asn1.PACOptionFlags.prettyPrintNamedValues =\
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krb5_asn1.PACOptionFlagsValues.namedValues
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krb5_asn1.PACOptionFlags.namedValues =\
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krb5_asn1.PACOptionFlagsValues.namedValues
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krb5_asn1.PACOptionFlags.prettyPrint =\
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BitString_NamedValues_prettyPrint
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def Integer_NamedValues_prettyPrint(self, scope=0):
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intval = int(self)
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if intval in self.prettyPrintNamedValues:
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name = self.prettyPrintNamedValues[intval]
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else:
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name = "<__unknown__>"
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ret = "%d (0x%x) %s" % (intval, intval, name)
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return ret
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krb5_asn1.NameType.prettyPrintNamedValues =\
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krb5_asn1.NameTypeValues.namedValues
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krb5_asn1.NameType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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krb5_asn1.AuthDataType.prettyPrintNamedValues =\
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krb5_asn1.AuthDataTypeValues.namedValues
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krb5_asn1.AuthDataType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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krb5_asn1.PADataType.prettyPrintNamedValues =\
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krb5_asn1.PADataTypeValues.namedValues
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krb5_asn1.PADataType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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krb5_asn1.EncryptionType.prettyPrintNamedValues =\
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krb5_asn1.EncryptionTypeValues.namedValues
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krb5_asn1.EncryptionType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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krb5_asn1.ChecksumType.prettyPrintNamedValues =\
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krb5_asn1.ChecksumTypeValues.namedValues
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krb5_asn1.ChecksumType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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krb5_asn1.KerbErrorDataType.prettyPrintNamedValues =\
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krb5_asn1.KerbErrorDataTypeValues.namedValues
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krb5_asn1.KerbErrorDataType.prettyPrint =\
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Integer_NamedValues_prettyPrint
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class Krb5EncryptionKey(object):
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def __init__(self, key, kvno):
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EncTypeChecksum = {
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kcrypto.Enctype.AES256: kcrypto.Cksumtype.SHA1_AES256,
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kcrypto.Enctype.AES128: kcrypto.Cksumtype.SHA1_AES128,
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kcrypto.Enctype.RC4: kcrypto.Cksumtype.HMAC_MD5,
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}
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self.key = key
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self.etype = key.enctype
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self.ctype = EncTypeChecksum[self.etype]
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self.kvno = kvno
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return
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def encrypt(self, usage, plaintext):
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ciphertext = kcrypto.encrypt(self.key, usage, plaintext)
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return ciphertext
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def decrypt(self, usage, ciphertext):
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plaintext = kcrypto.decrypt(self.key, usage, ciphertext)
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return plaintext
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def make_checksum(self, usage, plaintext, ctype=None):
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if ctype is None:
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ctype = self.ctype
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cksum = kcrypto.make_checksum(ctype, self.key, usage, plaintext)
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return cksum
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def export_obj(self):
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EncryptionKey_obj = {
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'keytype': self.etype,
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'keyvalue': self.key.contents,
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}
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return EncryptionKey_obj
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class KerberosCredentials(Credentials):
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def __init__(self):
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super(KerberosCredentials, self).__init__()
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all_enc_types = 0
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all_enc_types |= security.KERB_ENCTYPE_RC4_HMAC_MD5
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all_enc_types |= security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96
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all_enc_types |= security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96
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self.as_supported_enctypes = all_enc_types
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self.tgs_supported_enctypes = all_enc_types
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self.ap_supported_enctypes = all_enc_types
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self.kvno = None
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self.forced_keys = {}
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self.forced_salt = None
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return
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def set_as_supported_enctypes(self, value):
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self.as_supported_enctypes = int(value)
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return
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def set_tgs_supported_enctypes(self, value):
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self.tgs_supported_enctypes = int(value)
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return
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def set_ap_supported_enctypes(self, value):
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self.ap_supported_enctypes = int(value)
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return
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def _get_krb5_etypes(self, supported_enctypes):
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etypes = ()
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if supported_enctypes & security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96:
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etypes += (kcrypto.Enctype.AES256,)
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if supported_enctypes & security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96:
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etypes += (kcrypto.Enctype.AES128,)
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if supported_enctypes & security.KERB_ENCTYPE_RC4_HMAC_MD5:
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etypes += (kcrypto.Enctype.RC4,)
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return etypes
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def get_as_krb5_etypes(self):
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return self._get_krb5_etypes(self.as_supported_enctypes)
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def get_tgs_krb5_etypes(self):
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return self._get_krb5_etypes(self.tgs_supported_enctypes)
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def get_ap_krb5_etypes(self):
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return self._get_krb5_etypes(self.ap_supported_enctypes)
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def set_kvno(self, kvno):
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self.kvno = kvno
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def get_kvno(self):
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return self.kvno
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def set_forced_key(self, etype, hexkey):
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etype = int(etype)
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contents = binascii.a2b_hex(hexkey)
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key = kcrypto.Key(etype, contents)
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self.forced_keys[etype] = Krb5EncryptionKey(key, self.kvno)
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def get_forced_key(self, etype):
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etype = int(etype)
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if etype in self.forced_keys:
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return self.forced_keys[etype]
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return None
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def set_forced_salt(self, salt):
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self.forced_salt = bytes(salt)
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return
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def get_forced_salt(self):
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return self.forced_salt
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class RawKerberosTest(TestCaseInTempDir):
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"""A raw Kerberos Test case."""
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def setUp(self):
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super().setUp()
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self.do_asn1_print = False
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self.do_hexdump = False
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strict_checking = samba.tests.env_get_var_value('STRICT_CHECKING', allow_missing=True)
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if strict_checking is None:
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strict_checking = '1'
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self.strict_checking = bool(int(strict_checking))
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self.host = samba.tests.env_get_var_value('SERVER')
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self.s = None
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def tearDown(self):
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self._disconnect("tearDown")
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super().tearDown()
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def _disconnect(self, reason):
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if self.s is None:
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return
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self.s.close()
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self.s = None
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if self.do_hexdump:
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sys.stderr.write("disconnect[%s]\n" % reason)
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def _connect_tcp(self):
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tcp_port = 88
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try:
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self.a = socket.getaddrinfo(self.host, tcp_port, socket.AF_UNSPEC,
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socket.SOCK_STREAM, socket.SOL_TCP,
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0)
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self.s = socket.socket(self.a[0][0], self.a[0][1], self.a[0][2])
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self.s.settimeout(10)
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self.s.connect(self.a[0][4])
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except socket.error:
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self.s.close()
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raise
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except IOError:
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self.s.close()
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raise
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except Exception:
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raise
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finally:
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pass
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def connect(self):
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self.assertNotConnected()
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self._connect_tcp()
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if self.do_hexdump:
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sys.stderr.write("connected[%s]\n" % self.host)
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return
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def _get_krb5_creds(self, prefix,
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default_username=None,
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allow_missing_password=False,
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require_strongest_key=False):
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c = KerberosCredentials()
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c.guess()
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def env_get_var(varname, prefix, fallback_default=True, allow_missing=False):
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val = None
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if prefix is not None:
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allow_missing_prefix = allow_missing
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if fallback_default:
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allow_missing_prefix = True
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val = samba.tests.env_get_var_value('%s_%s' % (prefix, varname),
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allow_missing=allow_missing_prefix)
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else:
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fallback_default = True
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if val is None and fallback_default:
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val = samba.tests.env_get_var_value(varname,
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allow_missing=allow_missing)
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return val
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domain = env_get_var('DOMAIN', prefix)
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realm = env_get_var('REALM', prefix)
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allow_missing_username = False
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if default_username is not None:
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allow_missing_username = True
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username = env_get_var('USERNAME', prefix,
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fallback_default=False,
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allow_missing=allow_missing_username)
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if username is None:
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username = default_username
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password = env_get_var('PASSWORD', prefix,
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fallback_default=False,
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allow_missing=allow_missing_password)
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c.set_domain(domain)
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c.set_realm(realm)
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c.set_username(username)
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if password is not None:
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c.set_password(password)
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as_supported_enctypes = env_get_var('AS_SUPPORTED_ENCTYPES',
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prefix, allow_missing=True)
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if as_supported_enctypes is not None:
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c.set_as_supported_enctypes(as_supported_enctypes)
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tgs_supported_enctypes = env_get_var('TGS_SUPPORTED_ENCTYPES',
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prefix, allow_missing=True)
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if tgs_supported_enctypes is not None:
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c.set_tgs_supported_enctypes(tgs_supported_enctypes)
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ap_supported_enctypes = env_get_var('AP_SUPPORTED_ENCTYPES',
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prefix, allow_missing=True)
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if ap_supported_enctypes is not None:
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c.set_ap_supported_enctypes(ap_supported_enctypes)
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if require_strongest_key:
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kvno_allow_missing = False
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if password is None:
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aes256_allow_missing = False
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else:
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aes256_allow_missing = True
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else:
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kvno_allow_missing = True
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aes256_allow_missing = True
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kvno = env_get_var('KVNO', prefix,
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fallback_default=False,
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allow_missing=kvno_allow_missing)
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if kvno is not None:
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c.set_kvno(kvno)
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aes256_key = env_get_var('AES256_KEY_HEX', prefix,
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fallback_default=False,
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allow_missing=aes256_allow_missing)
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if aes256_key is not None:
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c.set_forced_key(kcrypto.Enctype.AES256, aes256_key)
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aes128_key = env_get_var('AES128_KEY_HEX', prefix,
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fallback_default=False, allow_missing=True)
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if aes128_key is not None:
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c.set_forced_key(kcrypto.Enctype.AES128, aes128_key)
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rc4_key = env_get_var('RC4_KEY_HEX', prefix,
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fallback_default=False, allow_missing=True)
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if rc4_key is not None:
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c.set_forced_key(kcrypto.Enctype.RC4, rc4_key)
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return c
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def get_user_creds(self, allow_missing_password=False):
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c = self._get_krb5_creds(prefix=None,
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allow_missing_password=allow_missing_password)
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return c
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def get_service_creds(self, allow_missing_password=False):
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c = self._get_krb5_creds(prefix='SERVICE',
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allow_missing_password=allow_missing_password)
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return c
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def get_client_creds(self, allow_missing_password=False):
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c = self._get_krb5_creds(prefix='CLIENT',
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allow_missing_password=allow_missing_password)
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return c
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def get_server_creds(self, allow_missing_password=False):
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c = self._get_krb5_creds(prefix='SERVER',
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allow_missing_password=allow_missing_password)
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return c
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def get_krbtgt_creds(self, require_strongest_key=False):
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c = self._get_krb5_creds(prefix='KRBTGT',
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default_username='krbtgt',
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allow_missing_password=True,
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require_strongest_key=require_strongest_key)
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return c
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def get_anon_creds(self):
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c = Credentials()
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c.set_anonymous()
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return c
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def asn1_dump(self, name, obj, asn1_print=None):
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if asn1_print is None:
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asn1_print = self.do_asn1_print
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if asn1_print:
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if name is not None:
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sys.stderr.write("%s:\n%s" % (name, obj))
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else:
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sys.stderr.write("%s" % (obj))
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def hex_dump(self, name, blob, hexdump=None):
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if hexdump is None:
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hexdump = self.do_hexdump
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if hexdump:
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sys.stderr.write(
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"%s: %d\n%s" % (name, len(blob), self.hexdump(blob)))
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def der_decode(
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self,
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blob,
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asn1Spec=None,
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native_encode=True,
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asn1_print=None,
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hexdump=None):
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if asn1Spec is not None:
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class_name = type(asn1Spec).__name__.split(':')[0]
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else:
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class_name = "<None-asn1Spec>"
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self.hex_dump(class_name, blob, hexdump=hexdump)
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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
|
|
finally:
|
|
pass
|
|
|
|
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")
|
|
pass
|
|
except socket.error as e:
|
|
self._disconnect("recv_raw: %s" % e)
|
|
raise
|
|
except IOError as e:
|
|
self._disconnect("recv_raw: %s" % e)
|
|
raise
|
|
finally:
|
|
pass
|
|
return rep_pdu
|
|
|
|
def recv_pdu_raw(self, asn1_print=None, hexdump=None, timeout=None):
|
|
rep_pdu = None
|
|
rep = None
|
|
try:
|
|
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, [11, 13, 30])
|
|
if msg_type == 11:
|
|
asn1Spec = krb5_asn1.AS_REP()
|
|
elif msg_type == 13:
|
|
asn1Spec = krb5_asn1.TGS_REP()
|
|
elif msg_type == 30:
|
|
asn1Spec = krb5_asn1.KRB_ERROR()
|
|
rep = self.der_decode(rep_pdu, asn1Spec=asn1Spec,
|
|
asn1_print=asn1_print, hexdump=False)
|
|
finally:
|
|
pass
|
|
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")
|
|
return
|
|
|
|
def assertNotConnected(self):
|
|
self.assertIsNone(self.s, msg="Is connected")
|
|
return
|
|
|
|
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)
|
|
return
|
|
|
|
def assertHasValue(self, value):
|
|
self.assertIsNotNone(value)
|
|
return
|
|
|
|
def getElementValue(self, obj, elem):
|
|
v = None
|
|
try:
|
|
v = obj[elem]
|
|
except KeyError:
|
|
pass
|
|
return v
|
|
|
|
def assertElementMissing(self, obj, elem):
|
|
v = self.getElementValue(obj, elem)
|
|
self.assertIsNone(v)
|
|
return
|
|
|
|
def assertElementPresent(self, obj, elem):
|
|
v = self.getElementValue(obj, elem)
|
|
self.assertIsNotNone(v)
|
|
return
|
|
|
|
def assertElementEqual(self, obj, elem, value):
|
|
v = self.getElementValue(obj, elem)
|
|
self.assertIsNotNone(v)
|
|
self.assertEqual(v, value)
|
|
return
|
|
|
|
def assertElementEqualUTF8(self, obj, elem, value):
|
|
v = self.getElementValue(obj, elem)
|
|
self.assertIsNotNone(v)
|
|
self.assertEqual(v, bytes(value, 'utf8'))
|
|
return
|
|
|
|
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))
|
|
return
|
|
|
|
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)
|
|
return
|
|
|
|
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)
|
|
# value == 0 means we don't know the kvno
|
|
# but enforce at any value != 0 is present
|
|
value = int(value)
|
|
if value != 0:
|
|
self.assertEqual(v, value)
|
|
else:
|
|
self.assertIsNone(v)
|
|
return
|
|
|
|
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 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 = None
|
|
try:
|
|
salt = etype_info2['salt']
|
|
except Exception:
|
|
pass
|
|
|
|
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 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(self, 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 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 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(128, pa_pac) # PA-PAC-REQUEST
|
|
return pa_data
|
|
|
|
def KDC_REQ_BODY_create(self,
|
|
kdc_options,
|
|
cname,
|
|
realm,
|
|
sname,
|
|
from_time,
|
|
till_time,
|
|
renew_time,
|
|
nonce,
|
|
etypes,
|
|
addresses,
|
|
EncAuthorizationData,
|
|
EncAuthorizationData_key,
|
|
additional_tickets,
|
|
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, 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
|
|
EncAuthorizationData,
|
|
EncAuthorizationData_key,
|
|
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,
|
|
EncAuthorizationData,
|
|
EncAuthorizationData_key,
|
|
additional_tickets,
|
|
asn1_print=asn1_print,
|
|
hexdump=hexdump)
|
|
obj, decoded = self.KDC_REQ_create(
|
|
msg_type=10,
|
|
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': 14,
|
|
'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
|
|
# }
|
|
|
|
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,
|
|
EncAuthorizationData=EncAuthorizationData,
|
|
EncAuthorizationData_key=EncAuthorizationData_key,
|
|
additional_tickets=additional_tickets)
|
|
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, 6, 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, 7, 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(1, 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=12,
|
|
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, 17, 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(129, pa_s4u2self)
|