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# SECUREAUTH LABS. Copyright 2018 SecureAuth Corporation. All rights reserved. 

# 

# This software is provided under under a slightly modified version 

# of the Apache Software License. See the accompanying LICENSE file 

# for more information. 

# 

# [C706] Transfer NDR Syntax implementation 

# 

# Author: Alberto Solino (@agsolino) 

# 

# ToDo: 

# [X] Unions and rest of the structured types 

# [ ] Documentation for this library, especially the support for Arrays 

# 

from __future__ import division 

from __future__ import print_function 

import random 

import inspect 

from struct import pack, unpack, calcsize 

from six import with_metaclass, PY3 

 

from impacket import LOG 

from impacket.dcerpc.v5.enum import Enum 

from impacket.uuid import uuidtup_to_bin 

 

# Something important to have in mind: 

# Diagrams do not depict the specified alignment gaps, which can appear in the octet stream 

# before an item (see Section 14.2.2 on page 620.) 

# Where necessary, an alignment gap, consisting of octets of unspecified value, *precedes* the 

# representation of a primitive. The gap is of the smallest size sufficient to align the primitive 

 

class NDR(object): 

""" 

This will be the base class for all DCERPC NDR Types and represents a NDR Primitive Type 

""" 

referent = () 

commonHdr = () 

commonHdr64 = () 

structure = () 

structure64 = () 

align = 4 

item = None 

_isNDR64 = False 

 

def __init__(self, data = None, isNDR64 = False): 

object.__init__(self) 

self._isNDR64 = isNDR64 

self.fields = {} 

 

if isNDR64 is True: 

if self.commonHdr64 != (): 

self.commonHdr = self.commonHdr64 

if self.structure64 != (): 

self.structure = self.structure64 

if hasattr(self, 'align64'): 

self.align = self.align64 

 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure+self.referent: 

if self.isNDR(fieldTypeOrClass): 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64) 

elif fieldTypeOrClass == ':': 

self.fields[fieldName] = b'' 

elif len(fieldTypeOrClass.split('=')) == 2: 

try: 

self.fields[fieldName] = eval(fieldTypeOrClass.split('=')[1]) 

except: 

self.fields[fieldName] = None 

else: 

self.fields[fieldName] = [] 

 

if data is not None: 

self.fromString(data) 

 

def changeTransferSyntax(self, newSyntax): 

NDR64Syntax = uuidtup_to_bin(('71710533-BEBA-4937-8319-B5DBEF9CCC36', '1.0')) 

76 ↛ 104line 76 didn't jump to line 104, because the condition on line 76 was never false if newSyntax == NDR64Syntax: 

if self._isNDR64 is False: 

# Ok, let's change everything 

self._isNDR64 = True 

for fieldName in list(self.fields.keys()): 

if isinstance(self.fields[fieldName], NDR): 

self.fields[fieldName].changeTransferSyntax(newSyntax) 

# Finally, I change myself 

if self.commonHdr64 != (): 

self.commonHdr = self.commonHdr64 

if self.structure64 != (): 

self.structure = self.structure64 

if hasattr(self, 'align64'): 

self.align = self.align64 

# And check whether the changes changed the data types 

# if so, I need to instantiate the new ones and copy the 

# old values 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure+self.referent: 

if isinstance(self.fields[fieldName], NDR): 

if fieldTypeOrClass != self.fields[fieldName].__class__ and isinstance(self.fields[fieldName], NDRPOINTERNULL) is False: 

backupData = self[fieldName] 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64) 

98 ↛ 101line 98 didn't jump to line 101, because the condition on line 98 was never false if 'Data' in self.fields[fieldName].fields: 

self.fields[fieldName].fields['Data'] = backupData 

else: 

self[fieldName] = backupData 

 

else: 

if self._isNDR64 is True: 

# Ok, nothing for now 

raise Exception('Shouldn\'t be here') 

 

def __setitem__(self, key, value): 

if isinstance(value, NDRPOINTERNULL): 

value = NDRPOINTERNULL(isNDR64 = self._isNDR64) 

if isinstance(self.fields[key], NDRPOINTER): 

self.fields[key] = value 

113 ↛ exitline 113 didn't return from function '__setitem__', because the condition on line 113 was never false elif 'Data' in self.fields[key].fields: 

if isinstance(self.fields[key].fields['Data'], NDRPOINTER): 

self.fields[key].fields['Data'] = value 

elif isinstance(value, NDR): 

# It's not a null pointer, ok. Another NDR type, but it  

# must be the same same as the iteam already in place 

if self.fields[key].__class__.__name__ == value.__class__.__name__: 

self.fields[key] = value 

elif isinstance(self.fields[key]['Data'], NDR): 

122 ↛ 125line 122 didn't jump to line 125, because the condition on line 122 was never false if self.fields[key]['Data'].__class__.__name__ == value.__class__.__name__: 

self.fields[key]['Data'] = value 

else: 

LOG.error("Can't setitem with class specified, should be %s" % self.fields[key]['Data'].__class__.__name__) 

else: 

LOG.error("Can't setitem with class specified, should be %s" % self.fields[key].__class__.__name__) 

elif isinstance(self.fields[key], NDR): 

self.fields[key]['Data'] = value 

else: 

self.fields[key] = value 

 

def __getitem__(self, key): 

if isinstance(self.fields[key], NDR): 

if 'Data' in self.fields[key].fields: 

return self.fields[key]['Data'] 

return self.fields[key] 

 

def __str__(self): 

return self.getData() 

 

def __len__(self): 

# XXX: improve 

return len(self.getData()) 

 

def getDataLen(self, data): 

return len(data) 

 

@staticmethod 

def isNDR(field): 

if inspect.isclass(field): 

myClass = field 

153 ↛ 155line 153 didn't jump to line 155, because the condition on line 153 was never false if issubclass(myClass, NDR): 

return True 

return False 

 

def dumpRaw(self, msg = None, indent = 0): 

if msg is None: 

msg = self.__class__.__name__ 

ind = ' '*indent 

print("\n%s" % msg) 

for field in self.commonHdr+self.structure+self.referent: 

i = field[0] 

164 ↛ 162line 164 didn't jump to line 162, because the condition on line 164 was never false if i in self.fields: 

if isinstance(self.fields[i], NDR): 

self.fields[i].dumpRaw('%s%s:{' % (ind,i), indent = indent + 4) 

print("%s}" % ind) 

 

elif isinstance(self.fields[i], list): 

print("%s[" % ind) 

for num,j in enumerate(self.fields[i]): 

if isinstance(j, NDR): 

j.dumpRaw('%s%s:' % (ind,i), indent = indent + 4) 

print("%s," % ind) 

else: 

print("%s%s: {%r}," % (ind, i, j)) 

print("%s]" % ind) 

 

else: 

print("%s%s: {%r}" % (ind,i,self[i])) 

 

def dump(self, msg = None, indent = 0): 

if msg is None: 

msg = self.__class__.__name__ 

ind = ' '*indent 

if msg != '': 

print("%s" % msg, end=' ') 

for fieldName, fieldType in self.commonHdr+self.structure+self.referent: 

189 ↛ 188line 189 didn't jump to line 188, because the condition on line 189 was never false if fieldName in self.fields: 

if isinstance(self.fields[fieldName], NDR): 

self.fields[fieldName].dump('\n%s%-31s' % (ind, fieldName+':'), indent = indent + 4), 

else: 

print(" %r" % (self[fieldName]), end=' ') 

 

def getAlignment(self): 

return self.align 

 

@staticmethod 

def calculatePad(fieldType, soFar): 

try: 

alignment = calcsize(fieldType.split('=')[0]) 

except: 

alignment = 0 

 

if alignment > 0: 

pad = (alignment - (soFar % alignment)) % alignment 

else: 

pad = 0 

 

return pad 

 

def getData(self, soFar = 0): 

data = b'' 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

# Alignment of Primitive Types 

 

# NDR enforces NDR alignment of primitive data; that is, any primitive of size n 

# octets is aligned at a octet stream index that is a multiple of n. 

# (In this version of NDR, n is one of {1, 2, 4, 8}.) An octet stream index indicates 

# the number of an octet in an octet stream when octets are numbered, beginning with 0, 

# from the first octet in the stream. Where necessary, an alignment gap, consisting of 

# octets of unspecified value, precedes the representation of a primitive. The gap is 

# of the smallest size sufficient to align the primitive. 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

if pad > 0: 

soFar += pad 

data += b'\xbf'*pad 

 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

 

data += res 

soFar += len(res) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

def fromString(self, data, soFar = 0): 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

# Alignment of Primitive Types 

 

# NDR enforces NDR alignment of primitive data; that is, any primitive of size n 

# octets is aligned at a octet stream index that is a multiple of n. 

# (In this version of NDR, n is one of {1, 2, 4, 8}.) An octet stream index indicates 

# the number of an octet in an octet stream when octets are numbered, beginning with 0, 

# from the first octet in the stream. Where necessary, an alignment gap, consisting of 

# octets of unspecified value, precedes the representation of a primitive. The gap is 

# of the smallest size sufficient to align the primitive. 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

if pad > 0: 

soFar += pad 

data = data[pad:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

return soFar - soFar0 

 

def pack(self, fieldName, fieldTypeOrClass, soFar = 0): 

if isinstance(self.fields[fieldName], NDR): 

return self.fields[fieldName].getData(soFar) 

 

data = self.fields[fieldName] 

# void specifier 

275 ↛ 276line 275 didn't jump to line 276, because the condition on line 275 was never true if fieldTypeOrClass[:1] == '_': 

return b'' 

 

# code specifier 

two = fieldTypeOrClass.split('=') 

if len(two) >= 2: 

try: 

return self.pack(fieldName, two[0], soFar) 

except: 

self.fields[fieldName] = eval(two[1], {}, self.fields) 

return self.pack(fieldName, two[0], soFar) 

 

if data is None: 

raise Exception('Trying to pack None') 

 

# literal specifier 

if fieldTypeOrClass[:1] == ':': 

if hasattr(data, 'getData'): 

return data.getData() 

return data 

 

# struct like specifier 

return pack(fieldTypeOrClass, data) 

 

def unpack(self, fieldName, fieldTypeOrClass, data, soFar = 0): 

size = self.calcUnPackSize(fieldTypeOrClass, data) 

data = data[:size] 

if isinstance(self.fields[fieldName], NDR): 

return self.fields[fieldName].fromString(data, soFar) 

 

# code specifier 

two = fieldTypeOrClass.split('=') 

if len(two) >= 2: 

return self.unpack(fieldName,two[0], data, soFar) 

 

# literal specifier 

if fieldTypeOrClass == ':': 

312 ↛ 313line 312 didn't jump to line 313, because the condition on line 312 was never true if isinstance(fieldTypeOrClass, NDR): 

return self.fields[fieldName].fromString(data, soFar) 

else: 

dataLen = self.getDataLen(data) 

self.fields[fieldName] = data[:dataLen] 

return dataLen 

 

# struct like specifier 

self.fields[fieldName] = unpack(fieldTypeOrClass, data)[0] 

return size 

 

def calcPackSize(self, fieldTypeOrClass, data): 

324 ↛ 325line 324 didn't jump to line 325, because the condition on line 324 was never true if isinstance(fieldTypeOrClass, str) is False: 

return len(data) 

 

# code specifier 

two = fieldTypeOrClass.split('=') 

if len(two) >= 2: 

return self.calcPackSize(two[0], data) 

 

# literal specifier 

if fieldTypeOrClass[:1] == ':': 

return len(data) 

 

# struct like specifier 

return calcsize(fieldTypeOrClass) 

 

def calcUnPackSize(self, fieldTypeOrClass, data): 

340 ↛ 341line 340 didn't jump to line 341, because the condition on line 340 was never true if isinstance(fieldTypeOrClass, str) is False: 

return len(data) 

 

# code specifier 

two = fieldTypeOrClass.split('=') 

if len(two) >= 2: 

return self.calcUnPackSize(two[0], data) 

 

# array specifier 

two = fieldTypeOrClass.split('*') 

350 ↛ 351line 350 didn't jump to line 351, because the condition on line 350 was never true if len(two) == 2: 

return len(data) 

 

# literal specifier 

if fieldTypeOrClass[:1] == ':': 

return len(data) 

 

# struct like specifier 

return calcsize(fieldTypeOrClass) 

 

# NDR Primitives 

class NDRSMALL(NDR): 

align = 1 

structure = ( 

('Data', 'b=0'), 

) 

 

class NDRUSMALL(NDR): 

align = 1 

structure = ( 

('Data', 'B=0'), 

) 

 

class NDRBOOLEAN(NDRSMALL): 

def dump(self, msg = None, indent = 0): 

if msg is None: 

msg = self.__class__.__name__ 

if msg != '': 

print(msg, end=' ') 

 

if self['Data'] > 0: 

print(" TRUE") 

else: 

print(" FALSE") 

 

class NDRCHAR(NDR): 

align = 1 

structure = ( 

('Data', 'c'), 

) 

 

class NDRSHORT(NDR): 

align = 2 

structure = ( 

('Data', '<h=0'), 

) 

 

class NDRUSHORT(NDR): 

align = 2 

structure = ( 

('Data', '<H=0'), 

) 

 

class NDRLONG(NDR): 

align = 4 

structure = ( 

('Data', '<l=0'), 

) 

 

class NDRULONG(NDR): 

align = 4 

structure = ( 

('Data', '<L=0'), 

) 

 

class NDRHYPER(NDR): 

align = 8 

structure = ( 

('Data', '<q=0'), 

) 

 

class NDRUHYPER(NDR): 

align = 8 

structure = ( 

('Data', '<Q=0'), 

) 

 

class NDRFLOAT(NDR): 

align = 4 

structure = ( 

('Data', '<f=0'), 

) 

 

class NDRDOUBLEFLOAT(NDR): 

align = 8 

structure = ( 

('Data', '<d=0'), 

) 

 

class EnumType(type): 

def __getattr__(self, attr): 

return self.enumItems[attr].value 

 

class NDRENUM(with_metaclass(EnumType, NDR)): 

align = 2 

align64 = 4 

structure = ( 

('Data', '<H'), 

) 

 

# 2.2.5.2 NDR64 Simple Data Types 

# NDR64 supports all simple types defined by NDR (as specified in [C706] section 14.2) 

# with the same alignment requirements except for enumerated types, which MUST be  

# represented as signed long integers (4 octets) in NDR64. 

structure64 = ( 

('Data', '<L'), 

) 

# enum MUST be an python enum (see enum.py) 

class enumItems(Enum): 

pass 

 

def __setitem__(self, key, value): 

462 ↛ 463line 462 didn't jump to line 463, because the condition on line 462 was never true if isinstance(value, Enum): 

self['Data'] = value.value 

else: 

return NDR.__setitem__(self,key,value) 

 

def dump(self, msg = None, indent = 0): 

468 ↛ 469line 468 didn't jump to line 469, because the condition on line 468 was never true if msg is None: 

msg = self.__class__.__name__ 

470 ↛ 473line 470 didn't jump to line 473, because the condition on line 470 was never false if msg != '': 

print(msg, end=' ') 

 

print(" %s" % self.enumItems(self.fields['Data']).name, end=' ') 

 

# NDR Constructed Types (arrays, strings, structures, unions, variant structures, pipes and pointers) 

class NDRCONSTRUCTEDTYPE(NDR): 

@staticmethod 

def isPointer(field): 

479 ↛ 483line 479 didn't jump to line 483, because the condition on line 479 was never false if inspect.isclass(field): 

myClass = field 

if issubclass(myClass, NDRPOINTER): 

return True 

return False 

 

@staticmethod 

def isUnion(field): 

487 ↛ 491line 487 didn't jump to line 491, because the condition on line 487 was never false if inspect.isclass(field): 

myClass = field 

if issubclass(myClass, NDRUNION): 

return True 

return False 

 

def getDataReferents(self, soFar = 0): 

data = b'' 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

data += self.fields[fieldName].getDataReferents(len(data)+soFar) 

data += self.fields[fieldName].getDataReferent(len(data)+soFar) 

return data 

 

def getDataReferent(self, soFar=0): 

data = b'' 

soFar0 = soFar 

504 ↛ 505line 504 didn't jump to line 505, because the condition on line 504 was never true if hasattr(self,'referent') is False: 

return b'' 

 

if 'ReferentID' in self.fields: 

if self['ReferentID'] == 0: 

return b'' 

 

for fieldName, fieldTypeOrClass in self.referent: 

try: 

if isinstance(self.fields[fieldName], NDRUniConformantArray) or isinstance(self.fields[fieldName], NDRUniConformantVaryingArray): 

# So we have an array, first item in the structure must be the array size, although we 

# will need to build it later. 

if self._isNDR64: 

arrayItemSize = 8 

arrayPackStr = '<Q' 

else: 

arrayItemSize = 4 

arrayPackStr = '<L' 

 

# The size information is itself aligned according to the alignment rules for 

# primitive data types. (See Section 14.2.2 on page 620.) The data of the constructed 

# type is then aligned according to the alignment rules for the constructed type. 

# In other words, the size information precedes the structure and is aligned 

# independently of the structure alignment. 

# We need to check whether we need padding or not 

pad0 = (arrayItemSize - (soFar % arrayItemSize)) % arrayItemSize 

if pad0 > 0: 

soFar += pad0 

arrayPadding = b'\xef'*pad0 

else: 

arrayPadding = b'' 

# And now, let's pretend we put the item in 

soFar += arrayItemSize 

data = self.fields[fieldName].getData(soFar) 

data = arrayPadding + pack(arrayPackStr, self.getArrayMaximumSize(fieldName)) + data 

else: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

541 ↛ 542line 541 didn't jump to line 542, because the condition on line 541 was never true if pad > 0: 

soFar += pad 

data += b'\xcc'*pad 

 

data += self.pack(fieldName, fieldTypeOrClass, soFar) 

 

# Any referent information to pack? 

548 ↛ 551line 548 didn't jump to line 551, because the condition on line 548 was never false if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

data += self.fields[fieldName].getDataReferents(soFar0 + len(data)) 

data += self.fields[fieldName].getDataReferent(soFar0 + len(data)) 

soFar = soFar0 + len(data) 

 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

def calcPackSize(self, fieldTypeOrClass, data): 

561 ↛ 562line 561 didn't jump to line 562, because the condition on line 561 was never true if isinstance(fieldTypeOrClass, str) is False: 

return len(data) 

 

# array specifier 

two = fieldTypeOrClass.split('*') 

566 ↛ 567line 566 didn't jump to line 567, because the condition on line 566 was never true if len(two) == 2: 

answer = 0 

for each in data: 

if self.isNDR(self.item): 

item = ':' 

else: 

item = self.item 

answer += self.calcPackSize(item, each) 

return answer 

else: 

return NDR.calcPackSize(self, fieldTypeOrClass, data) 

 

def getArrayMaximumSize(self, fieldName): 

if self.fields[fieldName].fields['MaximumCount'] is not None and self.fields[fieldName].fields['MaximumCount'] > 0: 

return self.fields[fieldName].fields['MaximumCount'] 

else: 

return self.fields[fieldName].getArraySize() 

 

def getArraySize(self,fieldName, data, soFar): 

if self._isNDR64: 

arrayItemSize = 8 

arrayUnPackStr = '<Q' 

else: 

arrayItemSize = 4 

arrayUnPackStr = '<L' 

 

pad0 = (arrayItemSize - (soFar % arrayItemSize)) % arrayItemSize 

if pad0 > 0: 

soFar += pad0 

data = data[pad0:] 

 

if isinstance(self.fields[fieldName], NDRUniConformantArray): 

# Array Size is at the very beginning 

arraySize = unpack(arrayUnPackStr, data[:arrayItemSize])[0] 

600 ↛ 610line 600 didn't jump to line 610, because the condition on line 600 was never false elif isinstance(self.fields[fieldName], NDRUniConformantVaryingArray): 

# NDRUniConformantVaryingArray Array 

# Unpack the Maximum Count 

maximumCount = unpack(arrayUnPackStr, data[:arrayItemSize])[0] 

# Let's store the Maximum Count for later use 

self.fields[fieldName].fields['MaximumCount'] = maximumCount 

# Unpack the Actual Count 

arraySize = unpack(arrayUnPackStr, data[arrayItemSize*2:][:arrayItemSize])[0] 

else: 

# NDRUniVaryingArray Array 

arraySize = unpack(arrayUnPackStr, data[arrayItemSize:][:arrayItemSize])[0] 

 

return arraySize, arrayItemSize+pad0 

 

def fromStringReferents(self, data, soFar = 0): 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

size = self.fields[fieldName].fromStringReferents(data, soFar) 

data = data[size:] 

soFar += size 

size = self.fields[fieldName].fromStringReferent(data, soFar) 

soFar += size 

data = data[size:] 

return soFar - soFar0 

 

def fromStringReferent(self, data, soFar = 0): 

627 ↛ 628line 627 didn't jump to line 628, because the condition on line 627 was never true if hasattr(self, 'referent') is not True: 

return 0 

 

soFar0 = soFar 

 

if 'ReferentID' in self.fields: 

if self['ReferentID'] == 0: 

# NULL Pointer, there's no referent for it 

return 0 

 

for fieldName, fieldTypeOrClass in self.referent: 

try: 

if isinstance(self.fields[fieldName], NDRUniConformantArray) or isinstance(self.fields[fieldName], NDRUniConformantVaryingArray): 

# Get the array size 

arraySize, advanceStream = self.getArraySize(fieldName, data, soFar) 

soFar += advanceStream 

data = data[advanceStream:] 

 

# Let's tell the array how many items are available 

self.fields[fieldName].setArraySize(arraySize) 

size = self.fields[fieldName].fromString(data, soFar) 

else: 

# ToDo: Align only if not NDR 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

651 ↛ 652line 651 didn't jump to line 652, because the condition on line 651 was never true if pad > 0: 

soFar += pad 

data = data[pad:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

657 ↛ 660line 657 didn't jump to line 660, because the condition on line 657 was never false if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

size += self.fields[fieldName].fromStringReferents(data[size:], soFar + size) 

size += self.fields[fieldName].fromStringReferent(data[size:], soFar + size) 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

 

return soFar-soFar0 

 

def calcUnPackSize(self, fieldTypeOrClass, data): 

if isinstance(fieldTypeOrClass, str) is False: 

return len(data) 

 

two = fieldTypeOrClass.split('*') 

674 ↛ 675line 674 didn't jump to line 675, because the condition on line 674 was never true if len(two) == 2: 

return len(data) 

else: 

return NDR.calcUnPackSize(self, fieldTypeOrClass, data) 

 

# Uni-dimensional Fixed Arrays 

class NDRArray(NDRCONSTRUCTEDTYPE): 

def dump(self, msg = None, indent = 0): 

682 ↛ 683line 682 didn't jump to line 683, because the condition on line 682 was never true if msg is None: 

msg = self.__class__.__name__ 

ind = ' '*indent 

if msg != '': 

print(msg, end=' ') 

 

if isinstance(self['Data'], list): 

print("\n%s[" % ind) 

ind += ' '*4 

for num,j in enumerate(self.fields['Data']): 

if isinstance(j, NDR): 

j.dump('%s' % ind, indent = indent + 4), 

print(",") 

else: 

print("%s %r," % (ind,j)) 

print("%s]" % ind[:-4], end=' ') 

else: 

print(" %r" % self['Data'], end=' ') 

 

def setArraySize(self, size): 

self.arraySize = size 

 

def getArraySize(self): 

return self.arraySize 

 

def changeTransferSyntax(self, newSyntax): 

# Here we gotta go over each item in the array and change the TS  

# Only if the item type is NDR 

if hasattr(self, 'item') and self.item is not None: 

if self.isNDR(self.item): 

for item in self.fields['Data']: 

item.changeTransferSyntax(newSyntax) 

return NDRCONSTRUCTEDTYPE.changeTransferSyntax(self, newSyntax) 

 

def getAlignment(self): 

# Array alignment is the largest alignment of the array element type and  

# the size information type, if any. 

align = 0 

# And now the item 

if hasattr(self, "item") and self.item is not None: 

if self.isNDR(self.item): 

tmpAlign = self.item().getAlignment() 

else: 

tmpAlign = self.calcPackSize(self.item, b'') 

726 ↛ 728line 726 didn't jump to line 728, because the condition on line 726 was never false if tmpAlign > align: 

align = tmpAlign 

return align 

 

def getData(self, soFar = 0): 

data = b'' 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.structure: 

try: 

735 ↛ 743line 735 didn't jump to line 743, because the condition on line 735 was never false if self.isNDR(fieldTypeOrClass) is False: 

# If the item is not NDR (e.g. ('MaximumCount', '<L=len(Data)')) 

# we have to align it 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

739 ↛ 740line 739 didn't jump to line 740, because the condition on line 739 was never true if pad > 0: 

soFar += pad 

data += b'\xca'*pad 

 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

data += res 

soFar = soFar0 + len(data) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

def pack(self, fieldName, fieldTypeOrClass, soFar = 0): 

# array specifier 

two = fieldTypeOrClass.split('*') 

if len(two) == 2: 

answer = b'' 

if self.isNDR(self.item): 

item = ':' 

dataClass = self.item 

self.fields['_tmpItem'] = dataClass(isNDR64=self._isNDR64) 

else: 

item = self.item 

dataClass = None 

self.fields['_tmpItem'] = item 

 

for each in (self.fields[fieldName]): 

pad = self.calculatePad(self.item, len(answer)+soFar) 

769 ↛ 770line 769 didn't jump to line 770, because the condition on line 769 was never true if pad > 0: 

answer += b'\xdd' * pad 

if dataClass is None: 

if item == 'c' and PY3 and isinstance(each, int): 

# Special case when dealing with PY3, here we have an integer we need to convert 

each = bytes([each]) 

answer += pack(item, each) 

else: 

answer += each.getData(len(answer)+soFar) 

 

if dataClass is not None: 

for each in self.fields[fieldName]: 

if isinstance(each, NDRCONSTRUCTEDTYPE): 

answer += each.getDataReferents(len(answer)+soFar) 

answer += each.getDataReferent(len(answer)+soFar) 

 

del(self.fields['_tmpItem']) 

if isinstance(self, NDRUniConformantArray) or isinstance(self, NDRUniConformantVaryingArray): 

# First field points to a field with the amount of items 

self.setArraySize(len(self.fields[fieldName])) 

else: 

self.fields[two[1]] = len(self.fields[fieldName]) 

 

return answer 

else: 

return NDRCONSTRUCTEDTYPE.pack(self, fieldName, fieldTypeOrClass, soFar) 

 

def fromString(self, data, soFar = 0): 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

800 ↛ 808line 800 didn't jump to line 808, because the condition on line 800 was never false if self.isNDR(fieldTypeOrClass) is False: 

# If the item is not NDR (e.g. ('MaximumCount', '<L=len(Data)')) 

# we have to align it 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

if pad > 0: 

soFar += pad 

data = data[pad:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

return soFar - soFar0 

 

def unpack(self, fieldName, fieldTypeOrClass, data, soFar = 0): 

# array specifier 

two = fieldTypeOrClass.split('*') 

answer = [] 

soFarItems = 0 

soFar0 = soFar 

if len(two) == 2: 

if isinstance(self, NDRUniConformantArray): 

# First field points to a field with the amount of items 

numItems = self.getArraySize() 

elif isinstance(self, NDRUniConformantVaryingArray): 

# In this case we have the MaximumCount but it could be different from the ActualCount. 

# Let's make the unpack figure this out. 

#self.fields['MaximumCount'] = self.getArraySize() 

numItems = self[two[1]] 

else: 

numItems = self[two[1]] 

 

# The item type is determined by self.item 

if self.isNDR(self.item): 

item = ':' 

dataClassOrCode = self.item 

self.fields['_tmpItem'] = dataClassOrCode(isNDR64=self._isNDR64) 

else: 

item = self.item 

dataClassOrCode = None 

self.fields['_tmpItem'] = item 

 

nsofar = 0 

while numItems and soFarItems < len(data): 

pad = self.calculatePad(self.item, soFarItems+soFar) 

849 ↛ 850line 849 didn't jump to line 850, because the condition on line 849 was never true if pad > 0: 

soFarItems +=pad 

if dataClassOrCode is None: 

nsofar = soFarItems + calcsize(item) 

answer.append(unpack(item, data[soFarItems:nsofar])[0]) 

else: 

itemn = dataClassOrCode(isNDR64=self._isNDR64) 

size = itemn.fromString(data[soFarItems:], soFar+soFarItems) 

answer.append(itemn) 

nsofar += size + pad 

numItems -= 1 

soFarItems = nsofar 

 

if dataClassOrCode is not None and isinstance(dataClassOrCode(), NDRCONSTRUCTEDTYPE): 

# We gotta go over again, asking for the referents 

data = data[soFarItems:] 

answer2 = [] 

for itemn in answer: 

size = itemn.fromStringReferents(data, soFarItems+soFar) 

soFarItems += size 

data = data[size:] 

size = itemn.fromStringReferent(data, soFarItems+soFar) 

soFarItems += size 

data = data[size:] 

answer2.append(itemn) 

answer = answer2 

del answer2 

 

del(self.fields['_tmpItem']) 

 

self.fields[fieldName] = answer 

return soFarItems + soFar - soFar0 

else: 

return NDRCONSTRUCTEDTYPE.unpack(self, fieldName, fieldTypeOrClass, data, soFar) 

 

class NDRUniFixedArray(NDRArray): 

structure = ( 

('Data',':'), 

) 

 

# Uni-dimensional Conformant Arrays 

class NDRUniConformantArray(NDRArray): 

item = 'c' 

structure = ( 

#('MaximumCount', '<L=len(Data)'), 

('Data', '*MaximumCount'), 

) 

 

structure64 = ( 

#('MaximumCount', '<Q=len(Data)'), 

('Data', '*MaximumCount'), 

) 

 

def __init__(self, data = None, isNDR64 = False): 

NDRArray.__init__(self, data, isNDR64) 

# Let's store the hidden MaximumCount field 

self.fields['MaximumCount'] = 0 

 

def __setitem__(self, key, value): 

self.fields['MaximumCount'] = None 

return NDRArray.__setitem__(self, key, value) 

 

 

# Uni-dimensional Varying Arrays 

class NDRUniVaryingArray(NDRArray): 

item = 'c' 

structure = ( 

('Offset','<L=0'), 

('ActualCount','<L=len(Data)'), 

('Data','*ActualCount'), 

) 

structure64 = ( 

('Offset','<Q=0'), 

('ActualCount','<Q=len(Data)'), 

('Data','*ActualCount'), 

) 

 

def __setitem__(self, key, value): 

self.fields['ActualCount'] = None 

return NDRArray.__setitem__(self, key, value) 

 

# Uni-dimensional Conformant-varying Arrays 

class NDRUniConformantVaryingArray(NDRArray): 

item = 'c' 

commonHdr = ( 

#('MaximumCount', '<L=len(Data)'), 

('Offset','<L=0'), 

('ActualCount','<L=len(Data)'), 

) 

commonHdr64 = ( 

#('MaximumCount', '<Q=len(Data)'), 

('Offset','<Q=0'), 

('ActualCount','<Q=len(Data)'), 

) 

 

structure = ( 

('Data','*ActualCount'), 

) 

 

def __init__(self, data = None, isNDR64 = False): 

NDRArray.__init__(self, data, isNDR64) 

# Let's store the hidden MaximumCount field 

self.fields['MaximumCount'] = 0 

 

def __setitem__(self, key, value): 

self.fields['MaximumCount'] = None 

self.fields['ActualCount'] = None 

return NDRArray.__setitem__(self, key, value) 

 

def getData(self, soFar = 0): 

data = b'' 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

964 ↛ 965line 964 didn't jump to line 965, because the condition on line 964 was never true if pad > 0: 

soFar += pad 

data += b'\xcb'*pad 

 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

data += res 

soFar = soFar0 + len(data) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

# Multidimensional arrays not implemented for now 

 

# Varying Strings 

class NDRVaryingString(NDRUniVaryingArray): 

def getData(self, soFar = 0): 

# The last element of a string is a terminator of the same size as the other elements.  

# If the string element size is one octet, the terminator is a NULL character.  

# The terminator for a string of multi-byte characters is the array element zero (0). 

986 ↛ 991line 986 didn't jump to line 991, because the condition on line 986 was never false if self["Data"][-1:] != b'\x00': 

if PY3 and isinstance(self["Data"],list) is False: 

self["Data"] = self["Data"] + b'\x00' 

else: 

self["Data"] = b''.join(self["Data"]) + b'\x00' 

return NDRUniVaryingArray.getData(self, soFar) 

 

def fromString(self, data, soFar = 0): 

ret = NDRUniVaryingArray.fromString(self,data) 

# Let's take out the last item 

self["Data"] = self["Data"][:-1] 

return ret 

 

# Conformant and Varying Strings 

class NDRConformantVaryingString(NDRUniConformantVaryingArray): 

pass 

 

# Structures 

# Structures Containing a Conformant Array  

# Structures Containing a Conformant and Varying Array  

class NDRSTRUCT(NDRCONSTRUCTEDTYPE): 

def getData(self, soFar = 0): 

data = b'' 

arrayPadding = b'' 

soFar0 = soFar 

# 14.3.7.1 Structures Containing a Conformant Array 

# A structure can contain a conformant array only as its last member. 

# In the NDR representation of a structure that contains a conformant array,  

# the unsigned long integers that give maximum element counts for dimensions of the array  

# are moved to the beginning of the structure, and the array elements appear in place at  

# the end of the structure. 

# 14.3.7.2 Structures Containing a Conformant and Varying Array 

# A structure can contain a conformant and varying array only as its last member. 

# In the NDR representation of a structure that contains a conformant and varying array,  

# the maximum counts for dimensions of the array are moved to the beginning of the structure,  

# but the offsets and actual counts remain in place at the end of the structure,  

# immediately preceding the array elements 

lastItem = (self.commonHdr+self.structure)[-1][0] 

if isinstance(self.fields[lastItem], NDRUniConformantArray) or isinstance(self.fields[lastItem], NDRUniConformantVaryingArray): 

# So we have an array, first item in the structure must be the array size, although we 

# will need to build it later. 

if self._isNDR64: 

arrayItemSize = 8 

arrayPackStr = '<Q' 

else: 

arrayItemSize = 4 

arrayPackStr = '<L' 

 

# The size information is itself aligned according to the alignment rules for  

# primitive data types. (See Section 14.2.2 on page 620.) The data of the constructed  

# type is then aligned according to the alignment rules for the constructed type.  

# In other words, the size information precedes the structure and is aligned  

# independently of the structure alignment. 

# We need to check whether we need padding or not 

pad0 = (arrayItemSize - (soFar % arrayItemSize)) % arrayItemSize 

if pad0 > 0: 

soFar += pad0 

arrayPadding = b'\xee'*pad0 

else: 

arrayPadding = b'' 

# And now, let's pretend we put the item in 

soFar += arrayItemSize 

else: 

arrayItemSize = 0 

 

# Now we need to align the structure  

# The alignment of a structure in the octet stream is the largest of the alignments of the fields it 

# contains. These fields may also be constructed types. The same alignment rules apply  

# recursively to nested constructed types. 

alignment = self.getAlignment() 

 

if alignment > 0: 

pad = (alignment - (soFar % alignment)) % alignment 

if pad > 0: 

soFar += pad 

data += b'\xAB'*pad 

 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

if isinstance(self.fields[fieldName], NDRUniConformantArray) or isinstance(self.fields[fieldName], NDRUniConformantVaryingArray): 

res = self.fields[fieldName].getData(soFar) 

if isinstance(self, NDRPOINTER): 

pointerData = data[:arrayItemSize] 

data = data[arrayItemSize:] 

data = pointerData + arrayPadding + pack(arrayPackStr ,self.getArrayMaximumSize(fieldName)) + data 

else: 

data = arrayPadding + pack(arrayPackStr, self.getArrayMaximumSize(fieldName)) + data 

arrayPadding = b'' 

arrayItemSize = 0 

else: 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

data += res 

soFar = soFar0 + len(data) + len(arrayPadding) + arrayItemSize 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

# 2.2.5.3.4.1 Structure with Trailing Gap 

# NDR64 represents a structure as an ordered sequence of representations of the 

# structure members. The trailing gap from the last nonconformant and nonvarying 

# field to the alignment of the structure MUST be represented as a trailing pad. 

# The size of the structure MUST be a multiple of its alignment. 

# See the following figure. 

 

# 4.8 Example of Structure with Trailing Gap in NDR64 

# This example shows a structure with a trailing gap in NDR64. 

# typedef struct _StructWithPad 

# { 

# long l; 

# short s; 

# } StructWithPad; 

# The size of the structure in the octet stream MUST contain a 2-byte trailing 

# gap to make its size 8, a multiple of the structure's alignment, 4. 

# if self._isNDR64 is True: 

# # ToDo add trailing gap here 

# if alignment > 0: 

# pad = (alignment - (soFar % alignment)) % alignment 

# if pad > 0: 

# soFar += pad 

# data += '\xcd'*pad 

# print self.__class__ , alignment, pad, hex(soFar) 

return data 

 

def fromString(self, data, soFar = 0 ): 

soFar0 = soFar 

# 14.3.7.1 Structures Containing a Conformant Array 

# A structure can contain a conformant array only as its last member. 

# In the NDR representation of a structure that contains a conformant array,  

# the unsigned long integers that give maximum element counts for dimensions of the array  

# are moved to the beginning of the structure, and the array elements appear in place at  

# the end of the structure. 

# 14.3.7.2 Structures Containing a Conformant and Varying Array 

# A structure can contain a conformant and varying array only as its last member. 

# In the NDR representation of a structure that contains a conformant and varying array,  

# the maximum counts for dimensions of the array are moved to the beginning of the structure,  

# but the offsets and actual counts remain in place at the end of the structure,  

# immediately preceding the array elements 

lastItem = (self.commonHdr+self.structure)[-1][0] 

if isinstance(self.fields[lastItem], NDRUniConformantArray) or isinstance(self.fields[lastItem], NDRUniConformantVaryingArray): 

# So we have an array, first item in the structure must be the array size, although we 

# will need to build it later. 

if self._isNDR64: 

arrayItemSize = 8 

else: 

arrayItemSize = 4 

 

# The size information is itself aligned according to the alignment rules for 

# primitive data types. (See Section 14.2.2 on page 620.) The data of the constructed  

# type is then aligned according to the alignment rules for the constructed type.  

# In other words, the size information precedes the structure and is aligned  

# independently of the structure alignment. 

# We need to check whether we need padding or not 

pad0 = (arrayItemSize - (soFar % arrayItemSize)) % arrayItemSize 

if pad0 > 0: 

soFar += pad0 

data = data[pad0:] 

# And now, let's pretend we put the item in 

soFar += arrayItemSize 

# And let's extract the array size for later use, if it is a pointer, it is after the referent ID 

if isinstance(self, NDRPOINTER): 

# ToDo: Check if we have to align the arrayItemSize 

# I guess is it aligned since the NDRPOINTER is aligned already 

pointerData = data[:arrayItemSize] 

arraySize, advanceStream = self.getArraySize(lastItem, data[arrayItemSize:], soFar+arrayItemSize) 

data = pointerData + data[arrayItemSize*2:] 

else: 

arraySize, advanceStream = self.getArraySize(lastItem, data, soFar) 

data = data[arrayItemSize:] 

# Let's tell the array how many items are available 

self.fields[lastItem].setArraySize(arraySize) 

 

# Now we need to align the structure 

# The alignment of a structure in the octet stream is the largest of the alignments of the fields it 

# contains. These fields may also be constructed types. The same alignment rules apply  

# recursively to nested constructed types. 

alignment = self.getAlignment() 

if alignment > 0: 

pad = (alignment - (soFar % alignment)) % alignment 

if pad > 0: 

soFar += pad 

data = data[pad:] 

 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

 

return soFar - soFar0 

 

def getAlignment(self): 

# Alignment of Constructed Types 

# 

# NDR enforces NDR alignment of structured data. As with primitive data types, an alignment, n, is determined 

# for the structure. Where necessary, an alignment gap of octets of unspecified value precedes the data in 

# the NDR octet stream. This gap is the smallest size sufficient to align the first field of the structure 

# on an NDR octet stream index of n. 

 

# The rules for calculating the alignment of constructed types are as follows: 

 

# 1) If a conformant structure-that is, a conformant or conformant varying array, or a structure containing 

# a conformant or conformant varying array-is embedded in the constructed type, and is the outermost 

# structure-that is, is not contained in another structure-then the size information from the contained 

# conformant structure is positioned so that it precedes both the containing constructed type and any 

# alignment gap for the constructed type. (See Section 14.3.7 for information about structures containing 

# arrays.) The size information is itself aligned according to the alignment rules for primitive data 

# types. (See Section 14.2.2 on page 620.) The data of the constructed type is then aligned according to 

# the alignment rules for the constructed type. In other words, the size information precedes the structure 

# and is aligned independently of the structure alignment. 

 

# 2) The alignment of a structure in the octet stream is the largest of the alignments of the fields it 

# contains. These fields may also be constructed types. The same alignment rules apply recursively to nested 

# constructed types. 

 

align = 0 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure+self.referent: 

if isinstance(self.fields[fieldName], NDR): 

tmpAlign = self.fields[fieldName].getAlignment() 

else: 

tmpAlign = self.calcPackSize(fieldTypeOrClass, b'') 

if tmpAlign > align: 

align = tmpAlign 

return align 

 

# Unions  

class NDRUNION(NDRCONSTRUCTEDTYPE): 

commonHdr = ( 

('tag', NDRUSHORT), 

) 

commonHdr64 = ( 

('tag', NDRULONG), 

) 

 

union = { 

# For example 

#1: ('pStatusChangeParam1', PSERVICE_NOTIFY_STATUS_CHANGE_PARAMS_1), 

#2: ('pStatusChangeParams', PSERVICE_NOTIFY_STATUS_CHANGE_PARAMS_2), 

} 

def __init__(self, data = None, isNDR64=False, topLevel = False): 

#ret = NDR.__init__(self,None, isNDR64=isNDR64) 

self.topLevel = topLevel 

self._isNDR64 = isNDR64 

self.fields = {} 

 

if isNDR64 is True: 

1237 ↛ 1239line 1237 didn't jump to line 1239, because the condition on line 1237 was never false if self.commonHdr64 != (): 

self.commonHdr = self.commonHdr64 

1239 ↛ 1240line 1239 didn't jump to line 1240, because the condition on line 1239 was never true if self.structure64 != (): 

self.structure = self.structure64 

1241 ↛ 1242line 1241 didn't jump to line 1242, because the condition on line 1241 was never true if hasattr(self, 'align64'): 

self.align = self.align64 

 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure+self.referent: 

1245 ↛ 1252line 1245 didn't jump to line 1252, because the condition on line 1245 was never false if self.isNDR(fieldTypeOrClass): 

if self.isPointer(fieldTypeOrClass): 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64, topLevel = topLevel) 

1248 ↛ 1249line 1248 didn't jump to line 1249, because the condition on line 1248 was never true elif self.isUnion(fieldTypeOrClass): 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64, topLevel = topLevel) 

else: 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64) 

elif fieldTypeOrClass == ':': 

self.fields[fieldName] = None 

elif len(fieldTypeOrClass.split('=')) == 2: 

try: 

self.fields[fieldName] = eval(fieldTypeOrClass.split('=')[1]) 

except: 

self.fields[fieldName] = None 

else: 

self.fields[fieldName] = 0 

 

1262 ↛ 1263line 1262 didn't jump to line 1263, because the condition on line 1262 was never true if data is not None: 

self.fromString(data) 

 

def __setitem__(self, key, value): 

if key == 'tag': 

# We're writing the tag, we now should set the right item for the structure 

self.structure = () 

1269 ↛ 1276line 1269 didn't jump to line 1276, because the condition on line 1269 was never false if value in self.union: 

self.structure = (self.union[value]), 

# Init again the structure 

self.__init__(None, isNDR64=self._isNDR64, topLevel = self.topLevel) 

self.fields['tag']['Data'] = value 

else: 

# Let's see if we have a default value 

if 'default' in self.union: 

if self.union['default'] is None: 

self.structure = () 

else: 

self.structure = (self.union['default']), 

# Init again the structure 

self.__init__(None, isNDR64=self._isNDR64, topLevel = self.topLevel) 

self.fields['tag']['Data'] = 0xffff 

else: 

raise Exception("Unknown tag %d for union!" % value) 

else: 

return NDRCONSTRUCTEDTYPE.__setitem__(self,key,value) 

 

def getData(self, soFar = 0): 

data = b'' 

soFar0 = soFar 

 

# Let's align ourselves 

alignment = self.getAlignment() 

1295 ↛ 1298line 1295 didn't jump to line 1298, because the condition on line 1295 was never false if alignment > 0: 

pad = (alignment - (soFar % alignment)) % alignment 

else: 

pad = 0 

if pad > 0: 

soFar += pad 

data += b'\xbc'*pad 

 

for fieldName, fieldTypeOrClass in self.commonHdr: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

1306 ↛ 1307line 1306 didn't jump to line 1307, because the condition on line 1306 was never true if pad > 0: 

soFar += pad 

data += b'\xbb'*pad 

 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

data += res 

soFar = soFar0 + len(data) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

# WARNING 

# Now we need to align what's coming next. 

# This doesn't come from the documentation but from seeing the packets in the wire 

# for some reason, even if the next field is a SHORT, it should be aligned to 

# a DWORD, or HYPER if NDR64.  

if self._isNDR64: 

align = 8 

else: 

1326 ↛ 1327line 1326 didn't jump to line 1327, because the condition on line 1326 was never true if hasattr(self, 'notAlign'): 

align = 1 

else: 

align = 4 

 

pad = (align - (soFar % align)) % align 

if pad > 0: 

data += b'\xbd'*pad 

soFar += pad 

 

1336 ↛ 1337line 1336 didn't jump to line 1337, because the condition on line 1336 was never true if self.structure is (): 

return data 

 

for fieldName, fieldTypeOrClass in self.structure: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

1342 ↛ 1343line 1342 didn't jump to line 1343, because the condition on line 1342 was never true if pad > 0: 

soFar += pad 

data += b'\xbe'*pad 

 

res = self.pack(fieldName, fieldTypeOrClass, soFar) 

data += res 

soFar = soFar0 + len(data) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

def fromString(self, data, soFar = 0 ): 

soFar0 = soFar 

# Let's align ourselves 

alignment = self.getAlignment() 

1360 ↛ 1363line 1360 didn't jump to line 1363, because the condition on line 1360 was never false if alignment > 0: 

pad = (alignment - (soFar % alignment)) % alignment 

else: 

pad = 0 

if pad > 0: 

soFar += pad 

data = data[pad:] 

 

1368 ↛ 1389line 1368 didn't jump to line 1389, because the condition on line 1368 was never false if len(data) > 4: 

# First off, let's see what the tag is: 

# We need to know the tag type and unpack it 

tagtype = self.commonHdr[0][1].structure[0][1].split('=')[0] 

tag = unpack(tagtype, data[:calcsize(tagtype)])[0] 

if tag in self.union: 

self.structure = (self.union[tag]), 

self.__init__(None, isNDR64=self._isNDR64, topLevel = self.topLevel) 

else: 

# Let's see if we have a default value 

1378 ↛ 1379line 1378 didn't jump to line 1379, because the condition on line 1378 was never true if 'default' in self.union: 

if self.union['default'] is None: 

self.structure = () 

else: 

self.structure = (self.union['default']), 

# Init again the structure 

self.__init__(None, isNDR64=self._isNDR64, topLevel = self.topLevel) 

self.fields['tag']['Data'] = 0xffff 

else: 

raise Exception("Unknown tag %d for union!" % tag) 

 

for fieldName, fieldTypeOrClass in self.commonHdr: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

1392 ↛ 1393line 1392 didn't jump to line 1393, because the condition on line 1392 was never true if pad > 0: 

soFar += pad 

data = data[pad:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

 

# WARNING 

# Now we need to align what's coming next. 

# This doesn't come from the documentation but from seeing the packets in the wire 

# for some reason, even if the next field is a SHORT, it should be aligned to 

# a DWORD, or HYPER if NDR64.  

if self._isNDR64: 

align = 8 

else: 

1413 ↛ 1414line 1413 didn't jump to line 1414, because the condition on line 1413 was never true if hasattr(self, 'notAlign'): 

align = 1 

else: 

align = 4 

 

pad = (align - (soFar % align)) % align 

if pad > 0: 

data = data[pad:] 

soFar += pad 

 

1423 ↛ 1424line 1423 didn't jump to line 1424, because the condition on line 1423 was never true if self.structure is (): 

return soFar-soFar0 

 

for fieldName, fieldTypeOrClass in self.structure: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

1429 ↛ 1430line 1429 didn't jump to line 1430, because the condition on line 1429 was never true if pad > 0: 

soFar += pad 

data = data[pad:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

 

return soFar - soFar0 

 

def getAlignment(self): 

# Union alignment is the largest alignment of the union discriminator  

# and all of the union arms. 

# WRONG, I'm calculating it just with the tag, if I do it with the  

# arms I get bad stub data. Something wrong I'm doing or the standard 

# is wrong (most probably it's me :s ) 

align = 0 

if self._isNDR64: 

fields = self.commonHdr+self.structure 

else: 

fields = self.commonHdr 

for fieldName, fieldTypeOrClass in fields: 

1456 ↛ 1459line 1456 didn't jump to line 1459, because the condition on line 1456 was never false if isinstance(self.fields[fieldName], NDR): 

tmpAlign = self.fields[fieldName].getAlignment() 

else: 

tmpAlign = self.calcPackSize(fieldTypeOrClass, b'') 

if tmpAlign > align: 

align = tmpAlign 

 

if self._isNDR64: 

for fieldName, fieldTypeOrClass in self.union.values(): 

tmpAlign = fieldTypeOrClass(isNDR64 = self._isNDR64).getAlignment() 

if tmpAlign > align: 

align = tmpAlign 

return align 

 

# Pipes not implemented for now 

 

# Pointers 

class NDRPOINTERNULL(NDR): 

align = 4 

align64 = 8 

structure = ( 

('Data', '<L=0'), 

) 

structure64 = ( 

('Data', '<Q=0'), 

) 

 

def dump(self, msg = None, indent = 0): 

1484 ↛ 1485line 1484 didn't jump to line 1485, because the condition on line 1484 was never true if msg is None: 

msg = self.__class__.__name__ 

1486 ↛ 1489line 1486 didn't jump to line 1489, because the condition on line 1486 was never false if msg != '': 

print("%s" % msg, end=' ') 

# Here we just print NULL 

print(" NULL", end=' ') 

 

NULL = NDRPOINTERNULL() 

 

class NDRPOINTER(NDRSTRUCT): 

align = 4 

align64 = 8 

commonHdr = ( 

('ReferentID','<L=0xff'), 

) 

commonHdr64 = ( 

('ReferentID','<Q=0xff'), 

) 

 

referent = ( 

# This is the representation of the Referent 

('Data',':'), 

) 

def __init__(self, data = None, isNDR64=False, topLevel = False): 

NDRSTRUCT.__init__(self,None, isNDR64=isNDR64) 

# If we are being called from a NDRCALL, it's a TopLevelPointer, 

# if not, it's a embeeded pointer. 

# It is *very* important, for every subclass of NDRPointer 

# you have to declare the referent in the referent variable 

# Not in the structure one! 

if topLevel is True: 

self.structure = self.referent 

self.referent = () 

 

1518 ↛ 1521line 1518 didn't jump to line 1521, because the condition on line 1518 was never false if data is None: 

self.fields['ReferentID'] = random.randint(1,65535) 

else: 

self.fromString(data) 

 

def __setitem__(self, key, value): 

if (key in self.fields) is False: 

# Key not found.. let's send it to the referent to handle, maybe it's there 

return self.fields['Data'].__setitem__(key,value) 

else: 

return NDRSTRUCT.__setitem__(self,key,value) 

 

def __getitem__(self, key): 

if key in self.fields: 

if isinstance(self.fields[key], NDR): 

if 'Data' in self.fields[key].fields: 

return self.fields[key]['Data'] 

return self.fields[key] 

else: 

# Key not found, let's send it to the referent, maybe it's there 

return self.fields['Data'].__getitem__(key) 

 

def getData(self, soFar = 0): 

# First of all we need to align ourselves 

data = b'' 

pad = self.calculatePad(self.commonHdr[0][1], soFar) 

if pad > 0: 

soFar += pad 

data = b'\xaa'*pad 

# If we have a ReferentID == 0, means there's no data 

if self.fields['ReferentID'] == 0: 

if len(self.referent) > 0: 

self['Data'] = b'' 

else: 

1552 ↛ 1553line 1552 didn't jump to line 1553, because the condition on line 1552 was never true if self._isNDR64 is True: 

return data+b'\x00'*8 

else: 

return data+b'\x00'*4 

 

return data + NDRSTRUCT.getData(self, soFar) 

 

def fromString(self,data,soFar = 0): 

# First of all we need to align ourselves 

pad = self.calculatePad(self.commonHdr[0][1], soFar) 

if pad > 0: 

soFar += pad 

data = data[pad:] 

 

# Do we have a Referent ID == 0? 

if self._isNDR64 is True: 

unpackStr = '<Q' 

else: 

unpackStr = '<L' 

 

if unpack(unpackStr, data[:calcsize(unpackStr)])[0] == 0: 

# Let's save the value 

self['ReferentID'] = 0 

self.fields['Data'] = b'' 

if self._isNDR64 is True: 

return pad + 8 

else: 

return pad + 4 

else: 

retVal = NDRSTRUCT.fromString(self,data, soFar) 

return retVal + pad 

 

def dump(self, msg = None, indent = 0): 

1585 ↛ 1586line 1585 didn't jump to line 1586, because the condition on line 1585 was never true if msg is None: 

msg = self.__class__.__name__ 

if msg != '': 

print("%s" % msg, end=' ') 

# Here we just print the referent 

if isinstance(self.fields['Data'], NDR): 

self.fields['Data'].dump('', indent = indent) 

else: 

1593 ↛ 1596line 1593 didn't jump to line 1596, because the condition on line 1593 was never false if self['ReferentID'] == 0: 

print(" NULL", end=' ') 

else: 

print(" %r" % (self['Data']), end=' ') 

 

def getAlignment(self): 

if self._isNDR64 is True: 

return 8 

else: 

return 4 

 

 

# Embedded Reference Pointers not implemented for now 

 

################################################################################ 

# Common RPC Data Types 

 

class PNDRUniConformantVaryingArray(NDRPOINTER): 

referent = ( 

('Data', NDRUniConformantVaryingArray), 

) 

 

class PNDRUniConformantArray(NDRPOINTER): 

referent = ( 

('Data', NDRUniConformantArray), 

) 

def __init__(self, data = None, isNDR64 = False, topLevel = False): 

NDRPOINTER.__init__(self,data,isNDR64,topLevel) 

 

class NDRCALL(NDRCONSTRUCTEDTYPE): 

# This represents a group of NDR instances that conforms an NDR Call. 

# The only different between a regular NDR instance is a NDR call must 

# represent the referents when building the final octet stream 

referent = () 

commonHdr = () 

commonHdr64 = () 

structure = () 

structure64 = () 

align = 4 

def __init__(self, data = None, isNDR64 = False): 

self._isNDR64 = isNDR64 

self.fields = {} 

 

if isNDR64 is True: 

1637 ↛ 1638line 1637 didn't jump to line 1638, because the condition on line 1637 was never true if self.commonHdr64 != (): 

self.commonHdr = self.commonHdr64 

1639 ↛ 1640line 1639 didn't jump to line 1640, because the condition on line 1639 was never true if self.structure64 != (): 

self.structure = self.structure64 

1641 ↛ 1642line 1641 didn't jump to line 1642, because the condition on line 1641 was never true if hasattr(self, 'align64'): 

self.align = self.align64 

 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure+self.referent: 

1645 ↛ 1652line 1645 didn't jump to line 1652, because the condition on line 1645 was never false if self.isNDR(fieldTypeOrClass): 

if self.isPointer(fieldTypeOrClass): 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64, topLevel = True) 

elif self.isUnion(fieldTypeOrClass): 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64, topLevel = True) 

else: 

self.fields[fieldName] = fieldTypeOrClass(isNDR64 = self._isNDR64) 

elif fieldTypeOrClass == ':': 

self.fields[fieldName] = None 

elif len(fieldTypeOrClass.split('=')) == 2: 

try: 

self.fields[fieldName] = eval(fieldTypeOrClass.split('=')[1]) 

except: 

self.fields[fieldName] = None 

else: 

self.fields[fieldName] = 0 

 

if data is not None: 

self.fromString(data) 

 

def dump(self, msg = None, indent = 0): 

NDRCONSTRUCTEDTYPE.dump(self, msg, indent) 

print('\n\n') 

 

def getData(self, soFar = 0): 

data = b'' 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

pad = self.calculatePad(fieldTypeOrClass, soFar) 

1675 ↛ 1676line 1675 didn't jump to line 1676, because the condition on line 1675 was never true if pad > 0: 

soFar += pad 

data += b'\xab'*pad 

 

# Are we dealing with an array? 

if isinstance(self.fields[fieldName], NDRUniConformantArray) or isinstance(self.fields[fieldName], 

NDRUniConformantVaryingArray): 

# Align size item 

if self._isNDR64: 

pad = (8 - (soFar % 8)) % 8 

else: 

pad = (4 - (soFar % 4)) % 4 

# Pack the item 

res = self.pack(fieldName, fieldTypeOrClass, soFar+pad) 

# Yes, get the array size 

arraySize = self.getArrayMaximumSize(fieldName) 

if self._isNDR64: 

pad = (8 - (soFar % 8)) % 8 

data += b'\xce'*pad + pack('<Q', arraySize) + res 

else: 

pad = (4 - (soFar % 4)) % 4 

data += b'\xce'*pad + pack('<L', arraySize) + res 

else: 

data += self.pack(fieldName, fieldTypeOrClass, soFar) 

 

soFar = soFar0 + len(data) 

# Any referent information to pack? 

# I'm still not sure whether this should go after processing 

# all the fields at the call level. 

# Guess we'll figure it out testing. 

if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

data += self.fields[fieldName].getDataReferents(soFar) 

soFar = soFar0 + len(data) 

data += self.fields[fieldName].getDataReferent(soFar) 

soFar = soFar0 + len(data) 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error packing field '%s | %s' in %s" % (fieldName, fieldTypeOrClass, self.__class__)) 

raise 

 

return data 

 

def fromString(self, data, soFar = 0): 

soFar0 = soFar 

for fieldName, fieldTypeOrClass in self.commonHdr+self.structure: 

try: 

# Are we dealing with an array? 

if isinstance(self.fields[fieldName], NDRUniConformantArray) or isinstance(self.fields[fieldName], 

NDRUniConformantVaryingArray): 

# Yes, get the array size 

arraySize, advanceStream = self.getArraySize(fieldName, data, soFar) 

self.fields[fieldName].setArraySize(arraySize) 

soFar += advanceStream 

data = data[advanceStream:] 

 

size = self.unpack(fieldName, fieldTypeOrClass, data, soFar) 

 

# Any referent information to unpack? 

if isinstance(self.fields[fieldName], NDRCONSTRUCTEDTYPE): 

size += self.fields[fieldName].fromStringReferents(data[size:], soFar + size) 

size += self.fields[fieldName].fromStringReferent(data[size:], soFar + size) 

data = data[size:] 

soFar += size 

except Exception as e: 

LOG.error(str(e)) 

LOG.error("Error unpacking field '%s | %s | %r'" % (fieldName, fieldTypeOrClass, data[:256])) 

raise 

 

return soFar - soFar0 

 

# Top Level Struct == NDRCALL 

NDRTLSTRUCT = NDRCALL 

 

class UNKNOWNDATA(NDR): 

align = 1 

structure = ( 

('Data', ':'), 

)