/usr/lib/python2.7/dist-packages/impacket/dcerpc/v5/transport.py is in python-impacket 0.9.15-1.
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#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Author: Alberto Solino (@agsolino)
#
# Description:
# Transport implementations for the DCE/RPC protocol.
#
import re
import socket
import binascii
import os
from impacket.smbconnection import smb, SMBConnection
from impacket import nmb
from impacket import ntlm
from impacket.dcerpc.v5.rpcrt import DCERPCException, DCERPC_v5, DCERPC_v4
class DCERPCStringBinding:
parser = re.compile(r'(?:([a-fA-F0-9-]{8}(?:-[a-fA-F0-9-]{4}){3}-[a-fA-F0-9-]{12})@)?' # UUID (opt.)
+'([_a-zA-Z0-9]*):' # Protocol Sequence
+'([^\[]*)' # Network Address (opt.)
+'(?:\[([^\]]*)\])?') # Endpoint and options (opt.)
def __init__(self, stringbinding):
match = DCERPCStringBinding.parser.match(stringbinding)
self.__uuid = match.group(1)
self.__ps = match.group(2)
self.__na = match.group(3)
options = match.group(4)
if options:
options = options.split(',')
self.__endpoint = options[0]
try:
self.__endpoint.index('endpoint=')
self.__endpoint = self.__endpoint[len('endpoint='):]
except:
pass
self.__options = options[1:]
else:
self.__endpoint = ''
self.__options = []
def get_uuid(self):
return self.__uuid
def get_protocol_sequence(self):
return self.__ps
def get_network_address(self):
return self.__na
def get_endpoint(self):
return self.__endpoint
def get_options(self):
return self.__options
def __str__(self):
return DCERPCStringBindingCompose(self.__uuid, self.__ps, self.__na, self.__endpoint, self.__options)
def DCERPCStringBindingCompose(uuid=None, protocol_sequence='', network_address='', endpoint='', options=[]):
s = ''
if uuid: s += uuid + '@'
s += protocol_sequence + ':'
if network_address: s += network_address
if endpoint or options:
s += '[' + endpoint
if options: s += ',' + ','.join(options)
s += ']'
return s
def DCERPCTransportFactory(stringbinding):
sb = DCERPCStringBinding(stringbinding)
na = sb.get_network_address()
ps = sb.get_protocol_sequence()
if 'ncadg_ip_udp' == ps:
port = sb.get_endpoint()
if port:
return UDPTransport(na, int(port))
else:
return UDPTransport(na)
elif 'ncacn_ip_tcp' == ps:
port = sb.get_endpoint()
if port:
return TCPTransport(na, int(port))
else:
return TCPTransport(na)
elif 'ncacn_http' == ps:
port = sb.get_endpoint()
if port:
return HTTPTransport(na, int(port))
else:
return HTTPTransport(na)
elif 'ncacn_np' == ps:
named_pipe = sb.get_endpoint()
if named_pipe:
named_pipe = named_pipe[len(r'\pipe'):]
return SMBTransport(na, filename = named_pipe)
else:
return SMBTransport(na)
elif 'ncalocal' == ps:
named_pipe = sb.get_endpoint()
return LOCALTransport(filename = named_pipe)
else:
raise DCERPCException("Unknown protocol sequence.")
class DCERPCTransport:
DCERPC_class = DCERPC_v5
def __init__(self, dstip, dstport):
self.__dstip = dstip
self.__dstport = dstport
self._max_send_frag = None
self._max_recv_frag = None
self._domain = ''
self._lmhash = ''
self._nthash = ''
self.__connect_timeout = None
self._doKerberos = False
self._username = ''
self._password = ''
self._domain = ''
self._aesKey = None
self._TGT = None
self._TGS = None
self._kdcHost = None
self.set_credentials('','')
def connect(self):
raise RuntimeError, 'virtual function'
def send(self,data=0, forceWriteAndx = 0, forceRecv = 0):
raise RuntimeError, 'virtual function'
def recv(self, forceRecv = 0, count = 0):
raise RuntimeError, 'virtual function'
def disconnect(self):
raise RuntimeError, 'virtual function'
def get_socket(self):
raise RuntimeError, 'virtual function'
def get_connect_timeout(self):
return self.__connect_timeout
def set_connect_timeout(self, timeout):
self.__connect_timeout = timeout
def get_dip(self):
return self.__dstip
def set_dip(self, dip):
"""This method only makes sense before connection for most protocols."""
self.__dstip = dip
def get_dport(self):
return self.__dstport
def set_dport(self, dport):
"""This method only makes sense before connection for most protocols."""
self.__dstport = dport
def get_addr(self):
return self.get_dip(), self.get_dport()
def set_addr(self, addr):
"""This method only makes sense before connection for most protocols."""
self.set_dip(addr[0])
self.set_dport(addr[1])
def set_kerberos(self, flag, kdcHost = None):
self._doKerberos = flag
self._kdcHost = kdcHost
def get_kerberos(self):
return self._doKerberos
def get_kdcHost(self):
return self._kdcHost
def set_max_fragment_size(self, send_fragment_size):
# -1 is default fragment size: 0 (don't fragment)
# 0 is don't fragment
# other values are max fragment size
if send_fragment_size == -1:
self.set_default_max_fragment_size()
else:
self._max_send_frag = send_fragment_size
def set_default_max_fragment_size(self):
# default is 0: don't fragment.
# subclasses may override this method
self._max_send_frag = 0
def get_credentials(self):
return (
self._username,
self._password,
self._domain,
self._lmhash,
self._nthash,
self._aesKey,
self._TGT,
self._TGS)
def set_credentials(self, username, password, domain='', lmhash='', nthash='', aesKey='', TGT=None, TGS=None):
self._username = username
self._password = password
self._domain = domain
self._aesKey = aesKey
self._TGT = TGT
self._TGS = TGS
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
self._lmhash = binascii.unhexlify(lmhash)
self._nthash = binascii.unhexlify(nthash)
except:
self._lmhash = lmhash
self._nthash = nthash
pass
def doesSupportNTLMv2(self):
# By default we'll be returning the library's deafult. Only on SMB Transports we might be able to know it beforehand
return ntlm.USE_NTLMv2
def get_dce_rpc(self):
return DCERPC_v5(self)
class UDPTransport(DCERPCTransport):
"Implementation of ncadg_ip_udp protocol sequence"
DCERPC_class = DCERPC_v4
def __init__(self,dstip, dstport = 135):
DCERPCTransport.__init__(self, dstip, dstport)
self.__socket = 0
self.set_connect_timeout(30)
self.__recv_addr = ''
def connect(self):
try:
af, socktype, proto, canonname, sa = socket.getaddrinfo(self.get_dip(), self.get_dport(), 0, socket.SOCK_DGRAM)[0]
self.__socket = socket.socket(af, socktype, proto)
self.__socket.settimeout(self.get_connect_timeout())
except socket.error, msg:
self.__socket = None
raise DCERPCException("Could not connect: %s" % msg)
return 1
def disconnect(self):
try:
self.__socket.close()
except socket.error:
self.__socket = None
return 0
return 1
def send(self,data, forceWriteAndx = 0, forceRecv = 0):
self.__socket.sendto(data,(self.get_dip(),self.get_dport()))
def recv(self, forceRecv = 0, count = 0):
buffer, self.__recv_addr = self.__socket.recvfrom(8192)
return buffer
def get_recv_addr(self):
return self.__recv_addr
def get_socket(self):
return self.__socket
class TCPTransport(DCERPCTransport):
"""Implementation of ncacn_ip_tcp protocol sequence"""
def __init__(self, dstip, dstport = 135):
DCERPCTransport.__init__(self, dstip, dstport)
self.__socket = 0
self.set_connect_timeout(30)
def connect(self):
af, socktype, proto, canonname, sa = socket.getaddrinfo(self.get_dip(), self.get_dport(), 0, socket.SOCK_STREAM)[0]
self.__socket = socket.socket(af, socktype, proto)
try:
self.__socket.settimeout(self.get_connect_timeout())
self.__socket.connect(sa)
except socket.error, msg:
self.__socket.close()
raise DCERPCException("Could not connect: %s" % msg)
return 1
def disconnect(self):
try:
self.__socket.close()
except socket.error, msg:
self.__socket = None
return 0
return 1
def send(self,data, forceWriteAndx = 0, forceRecv = 0):
if self._max_send_frag:
offset = 0
while 1:
toSend = data[offset:offset+self._max_send_frag]
if not toSend:
break
self.__socket.send(toSend)
offset += len(toSend)
else:
self.__socket.send(data)
def recv(self, forceRecv = 0, count = 0):
if count:
buffer = ''
while len(buffer) < count:
buffer += self.__socket.recv(count-len(buffer))
else:
buffer = self.__socket.recv(8192)
return buffer
def get_socket(self):
return self.__socket
class HTTPTransport(TCPTransport):
"""Implementation of ncacn_http protocol sequence"""
def connect(self):
TCPTransport.connect(self)
self.get_socket().send('RPC_CONNECT ' + self.get_dip() + ':593 HTTP/1.0\r\n\r\n')
data = self.get_socket().recv(8192)
if data[10:13] != '200':
raise DCERPCException("Service not supported.")
class SMBTransport(DCERPCTransport):
"""Implementation of ncacn_np protocol sequence"""
def __init__(self, dstip, dstport=445, filename='', username='', password='', domain='', lmhash='', nthash='',
aesKey='', TGT=None, TGS=None, remote_name='', smb_connection=0, doKerberos=False, kdcHost=None):
DCERPCTransport.__init__(self, dstip, dstport)
self.__socket = None
self.__tid = 0
self.__filename = filename
self.__handle = 0
self.__pending_recv = 0
self.set_credentials(username, password, domain, lmhash, nthash, aesKey, TGT, TGS)
self.__remote_name = remote_name
self._doKerberos = doKerberos
self._kdcHost = kdcHost
if smb_connection == 0:
self.__existing_smb = False
else:
self.__existing_smb = True
self.set_credentials(*smb_connection.getCredentials())
self.__prefDialect = None
if isinstance(smb_connection, smb.SMB):
# Backward compatibility hack, let's return a
# SMBBackwardCompatibilityTransport instance
return SMBBackwardCompatibilityTransport(filename = filename, smb_server = smb_connection)
else:
self.__smb_connection = smb_connection
def preferred_dialect(self, dialect):
self.__prefDialect = dialect
def setup_smb_connection(self):
if not self.__smb_connection:
if self.__remote_name == '':
if self.get_dport() == nmb.NETBIOS_SESSION_PORT:
self.__smb_connection = SMBConnection('*SMBSERVER', self.get_dip(), sess_port=self.get_dport(),
preferredDialect=self.__prefDialect)
else:
self.__smb_connection = SMBConnection(self.get_dip(), self.get_dip(), sess_port=self.get_dport(),
preferredDialect=self.__prefDialect)
else:
self.__smb_connection = SMBConnection(self.__remote_name, self.get_dip(), sess_port=self.get_dport(),
preferredDialect=self.__prefDialect)
def connect(self):
# Check if we have a smb connection already setup
if self.__smb_connection == 0:
self.setup_smb_connection()
if self._doKerberos is False:
self.__smb_connection.login(self._username, self._password, self._domain, self._lmhash, self._nthash)
else:
self.__smb_connection.kerberosLogin(self._username, self._password, self._domain, self._lmhash,
self._nthash, self._aesKey, kdcHost=self._kdcHost, TGT=self._TGT,
TGS=self._TGS)
self.__tid = self.__smb_connection.connectTree('IPC$')
self.__handle = self.__smb_connection.openFile(self.__tid, self.__filename)
self.__socket = self.__smb_connection.getSMBServer().get_socket()
return 1
def disconnect(self):
self.__smb_connection.disconnectTree(self.__tid)
# If we created the SMB connection, we close it, otherwise
# that's up for the caller
if self.__existing_smb is False:
self.__smb_connection.logoff()
self.__smb_connection = 0
def send(self,data, forceWriteAndx = 0, forceRecv = 0):
if self._max_send_frag:
offset = 0
while 1:
toSend = data[offset:offset+self._max_send_frag]
if not toSend:
break
self.__smb_connection.writeFile(self.__tid, self.__handle, toSend, offset = offset)
offset += len(toSend)
else:
self.__smb_connection.writeFile(self.__tid, self.__handle, data)
if forceRecv:
self.__pending_recv += 1
def recv(self, forceRecv = 0, count = 0 ):
if self._max_send_frag or self.__pending_recv:
# _max_send_frag is checked because it's the same condition we checked
# to decide whether to use write_andx() or send_trans() in send() above.
if self.__pending_recv:
self.__pending_recv -= 1
return self.__smb_connection.readFile(self.__tid, self.__handle, bytesToRead = self._max_recv_frag)
else:
return self.__smb_connection.readFile(self.__tid, self.__handle)
def get_smb_connection(self):
return self.__smb_connection
def set_smb_connection(self, smb_connection):
self.__smb_connection = smb_connection
self.set_credentials(*smb_connection.getCredentials())
self.__existing_smb = True
def get_smb_server(self):
# Raw Access to the SMBServer (whatever type it is)
return self.__smb_connection.getSMBServer()
def get_socket(self):
return self.__socket
def doesSupportNTLMv2(self):
return self.__smb_connection.doesSupportNTLMv2()
class LOCALTransport(DCERPCTransport):
"""
Implementation of ncalocal protocol sequence, not the same
as ncalrpc (I'm not doing LPC just opening the local pipe)
"""
def __init__(self, filename = ''):
DCERPCTransport.__init__(self, '', 0)
self.__filename = filename
self.__handle = 0
def connect(self):
if self.__filename.upper().find('PIPE') < 0:
self.__filename = '\\PIPE\\%s' % self.__filename
self.__handle = os.open('\\\\.\\%s' % self.__filename, os.O_RDWR|os.O_BINARY)
return 1
def disconnect(self):
os.close(self.__handle)
def send(self,data, forceWriteAndx = 0, forceRecv = 0):
os.write(self.__handle, data)
def recv(self, forceRecv = 0, count = 0 ):
data = os.read(self.__handle, 65535)
return data
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