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pykms_RpcBind.py
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pykms_RpcBind.py
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#!/usr/bin/env python3
import logging
import binascii
import uuid
import pykms_RpcBase
from pykms_Dcerpc import MSRPCHeader, MSRPCBindAck
from pykms_Structure import Structure
from pykms_Format import justify, byterize, enco, deco, pretty_printer
#--------------------------------------------------------------------------------------------------------------------------------------------------------
loggersrv = logging.getLogger('logsrv')
uuidNDR32 = uuid.UUID('8a885d04-1ceb-11c9-9fe8-08002b104860')
uuidNDR64 = uuid.UUID('71710533-beba-4937-8319-b5dbef9ccc36')
uuidTime = uuid.UUID('6cb71c2c-9812-4540-0300-000000000000')
uuidEmpty = uuid.UUID('00000000-0000-0000-0000-000000000000')
class CtxItem(Structure):
structure = (
('ContextID', '<H=0'),
('TransItems', 'B=0'),
('Pad', 'B=0'),
('AbstractSyntaxUUID', '16s=""'),
('AbstractSyntaxVer', '<I=0'),
('TransferSyntaxUUID', '16s=""'),
('TransferSyntaxVer', '<I=0'),
)
def ts(self):
return uuid.UUID(bytes_le = enco(self['TransferSyntaxUUID'], 'latin-1'))
class CtxItemResult(Structure):
structure = (
('Result', '<H=0'),
('Reason', '<H=0'),
('TransferSyntaxUUID', '16s=""'),
('TransferSyntaxVer', '<I=0'),
)
def __init__(self, result, reason, tsUUID, tsVer):
Structure.__init__(self)
self['Result'] = result
self['Reason'] = reason
self['TransferSyntaxUUID'] = tsUUID.bytes_le
self['TransferSyntaxVer'] = tsVer
class MSRPCBind(Structure):
class CtxItemArray:
def __init__(self, data):
self.data = data
def __len__(self):
return len(self.data)
def __str__(self):
return self.data
def __getitem__(self, i):
return CtxItem(self.data[(len(CtxItem()) * i):])
_CTX_ITEM_LEN = len(CtxItem())
structure = (
('max_tfrag', '<H=4280'),
('max_rfrag', '<H=4280'),
('assoc_group', '<L=0'),
('ctx_num', 'B=0'),
('Reserved', 'B=0'),
('Reserved2', '<H=0'),
('_ctx_items', '_-ctx_items', 'self["ctx_num"]*self._CTX_ITEM_LEN'),
('ctx_items', ':', CtxItemArray),
)
class handler(pykms_RpcBase.rpcBase):
def parseRequest(self):
request = MSRPCHeader(self.data)
pretty_printer(num_text = 3, where = "srv")
request = byterize(request)
loggersrv.debug("RPC Bind Request Bytes: \n%s\n" % justify(deco(binascii.b2a_hex(self.data), 'utf-8')))
loggersrv.debug("RPC Bind Request: \n%s\n%s\n" % (justify(request.dump(print_to_stdout = False)),
justify(MSRPCBind(request['pduData']).dump(print_to_stdout = False))))
return request
def generateResponse(self, request):
response = MSRPCBindAck()
bind = MSRPCBind(request['pduData'])
response['ver_major'] = request['ver_major']
response['ver_minor'] = request['ver_minor']
response['type'] = self.packetType['bindAck']
response['flags'] = self.packetFlags['firstFrag'] | self.packetFlags['lastFrag'] | self.packetFlags['multiplex']
response['representation'] = request['representation']
response['frag_len'] = 36 + bind['ctx_num'] * 24
response['auth_len'] = request['auth_len']
response['call_id'] = request['call_id']
response['max_tfrag'] = bind['max_tfrag']
response['max_rfrag'] = bind['max_rfrag']
response['assoc_group'] = 0x1063bf3f
port = str(self.srv_config['port'])
response['SecondaryAddrLen'] = len(port) + 1
response['SecondaryAddr'] = port
pad = (4 - ((response["SecondaryAddrLen"] + MSRPCBindAck._SIZE) % 4)) % 4
response['Pad'] = '\0' * pad
response['ctx_num'] = bind['ctx_num']
preparedResponses = {}
preparedResponses[uuidNDR32] = CtxItemResult(0, 0, uuidNDR32, 2)
preparedResponses[uuidNDR64] = CtxItemResult(2, 2, uuidEmpty, 0)
preparedResponses[uuidTime] = CtxItemResult(3, 3, uuidEmpty, 0)
response['ctx_items'] = ''
for i in range (0, bind['ctx_num']):
ts_uuid = bind['ctx_items'][i].ts()
resp = preparedResponses[ts_uuid]
response['ctx_items'] += str(resp)
pretty_printer(num_text = 4, where = "srv")
response = byterize(response)
loggersrv.debug("RPC Bind Response: \n%s\n" % justify(response.dump(print_to_stdout = False)))
loggersrv.debug("RPC Bind Response Bytes: \n%s\n" % justify(deco(binascii.b2a_hex(enco(str(response), 'latin-1')), 'utf-8')))
return response
def generateRequest(self):
firstCtxItem = CtxItem()
firstCtxItem['ContextID'] = 0
firstCtxItem['TransItems'] = 1
firstCtxItem['Pad'] = 0
firstCtxItem['AbstractSyntaxUUID'] = uuid.UUID('51c82175-844e-4750-b0d8-ec255555bc06').bytes_le
firstCtxItem['AbstractSyntaxVer'] = 1
firstCtxItem['TransferSyntaxUUID'] = uuidNDR32.bytes_le
firstCtxItem['TransferSyntaxVer'] = 2
secondCtxItem = CtxItem()
secondCtxItem['ContextID'] = 1
secondCtxItem['TransItems'] = 1
secondCtxItem['Pad'] = 0
secondCtxItem['AbstractSyntaxUUID'] = uuid.UUID('51c82175-844e-4750-b0d8-ec255555bc06').bytes_le
secondCtxItem['AbstractSyntaxVer'] = 1
secondCtxItem['TransferSyntaxUUID'] = uuidTime.bytes_le
secondCtxItem['TransferSyntaxVer'] = 1
bind = MSRPCBind()
bind['max_tfrag'] = 5840
bind['max_rfrag'] = 5840
bind['assoc_group'] = 0
bind['ctx_num'] = 2
bind['ctx_items'] = str(bind.CtxItemArray(str(firstCtxItem) + str(secondCtxItem)))
request = MSRPCHeader()
request['ver_major'] = 5
request['ver_minor'] = 0
request['type'] = self.packetType['bindReq']
request['flags'] = self.packetFlags['firstFrag'] | self.packetFlags['lastFrag'] | self.packetFlags['multiplex']
request['call_id'] = self.srv_config['call_id']
request['pduData'] = str(bind)
pretty_printer(num_text = 0, where = "clt")
bind = byterize(bind)
request = byterize(request)
loggersrv.debug("RPC Bind Request: \n%s\n%s\n" % (justify(request.dump(print_to_stdout = False)),
justify(MSRPCBind(request['pduData']).dump(print_to_stdout = False))))
loggersrv.debug("RPC Bind Request Bytes: \n%s\n" % justify(deco(binascii.b2a_hex(enco(str(request), 'latin-1')), 'utf-8')))
return request
def parseResponse(self):
return response