252 lines
8.2 KiB
Ruby
252 lines
8.2 KiB
Ruby
module Rex
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module Proto
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module DCERPC
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class Client
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require 'rex/proto/dcerpc/uuid'
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require 'rex/proto/dcerpc/response'
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require 'rex/proto/dcerpc/exceptions'
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require 'rex/text'
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require 'rex/proto/smb/exceptions'
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attr_accessor :handle, :socket, :options, :last_response, :context, :no_bind, :ispipe, :smb
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# initialize a DCE/RPC Function Call
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def initialize(handle, socket, useroptions = Hash.new)
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self.handle = handle
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self.socket = socket
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self.options = { 'smb_user' => '', 'smb_pass' => '' } # put default options here...
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self.options.merge!(useroptions)
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# we must have a valid handle, regardless of everything else
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raise ArgumentError, 'handle is not a Rex::Proto::DCERPC::Handle' if !self.handle.is_a?(Rex::Proto::DCERPC::Handle)
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# we do this in case socket needs setup first, ie, socket = nil
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if !self.options['no_socketsetup']
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self.socket_check()
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end
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raise ArgumentError, 'socket can not read' if !self.socket.respond_to?(:read)
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raise ArgumentError, 'socket can not write' if !self.socket.respond_to?(:write)
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if !self.options['no_autobind']
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self.bind()
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end
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end
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def socket_check()
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if self.socket == nil
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self.socket_setup()
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end
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case self.handle.protocol
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when 'ncacn_ip_tcp'
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if self.socket.type? != 'tcp'
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raise "ack, #{self.handle.protocol} requires socket type tcp, not #{self.socket.type?}!"
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end
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when 'ncacn_np'
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if self.socket.class == Rex::Proto::SMB::SimpleClient::OpenFile
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self.ispipe = 1
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elsif self.socket.type? == 'tcp'
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self.smb_connect()
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else
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raise "ack, #{self.handle.protocol} requires socket type tcp, not #{self.socket.type?}!"
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end
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# don't support ncacn_ip_udp yet
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## when 'ncacn_ip_udp'
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## if self.socket.type? != 'udp'
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## raise "ack, #{self.handle.protocol} requires socket type tcp, not #{self.socket.type?}!"
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## end
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else
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raise "Unsupported protocol : #{self.handle.protocol}"
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end
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end
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# Create the appropriate socket based on protocol
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def socket_setup()
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ctx = { 'Msf' => options['Msf'], 'MsfExploit' => options['MsfExploit'] }
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self.socket = case self.handle.protocol
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when 'ncacn_ip_tcp' then Rex::Socket.create_tcp('PeerHost' => self.handle.address, 'PeerPort' => self.handle.options[0], 'Context' => ctx)
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when 'ncacn_np' then begin
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socket = ''
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begin
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timeout(10) {
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socket = Rex::Socket.create_tcp('PeerHost' => self.handle.address, 'PeerPort' => 445, 'Context' => ctx)
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}
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rescue Timeout::Error, Rex::ConnectionRefused
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socket = Rex::Socket.create_tcp('PeerHost' => self.handle.address, 'PeerPort' => 139, 'Context' => ctx)
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end
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socket
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end
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else nil
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end
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# Add this socket to the exploit's list of open sockets
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options['MsfExploit'].add_socket(self.socket) if (options['MsfExploit'])
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end
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def smb_connect()
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require 'rex/proto/smb/simpleclient'
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if self.socket.peerport == 445
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smb = Rex::Proto::SMB::SimpleClient.new(self.socket, true)
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elsif self.socket.peerport == 139
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smb = Rex::Proto::SMB::SimpleClient.new(self.socket)
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else
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raise "ACK, how did we get a peerport other than 139 or 445? #{self.socket.peerport}"
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end
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smb.client.evasion_level = 0
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smb.login('*SMBSERVER', self.options['smb_user'], self.options['smb_pass'])
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smb.connect('IPC$')
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f = smb.create_pipe(self.handle.options[0])
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self.socket = f
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self.smb = smb
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end
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def read()
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raw_response = ''
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if self.socket.class == Rex::Proto::SMB::SimpleClient::OpenFile
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begin
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if self.options['segment_read']
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while(true)
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data = self.socket.read((rand(20)+5), rand(1024)+1)
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last if ! data.length
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raw_response += data
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end
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else
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raw_response = self.socket.read()
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end
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rescue Rex::Proto::SMB::Exceptions::NoReply
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# I don't care if I didn't get a reply...
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rescue Rex::Proto::SMB::Exceptions::ErrorCode => exception
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if exception.error_code != 0xC000014B
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raise exception
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end
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end
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else # must be a regular socket
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if self.socket.type? == 'tcp'
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if self.options['segment_read']
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while (true)
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data = self.socket.get_once(rand(5)+5, 10)
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break if data == nil
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break if ! data.length
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raw_response << data
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end
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else
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raw_response = self.socket.get_once(-1, 5)
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end
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else
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raw_response = self.socket.read(0xFFFFFFFF / 2 - 1) # read max data
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end
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end
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raw_response
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end
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def write(data)
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if self.options['segment_write']
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while (data.length > 0)
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len = self.socket.write( data.slice!(0, (rand(20)+5)) )
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end
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else
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self.socket.write(data)
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end
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data.length
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end
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def bind()
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require 'rex/proto/dcerpc/packet'
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bind = ''
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context = ''
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if self.options['fake_multi_bind']
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bind, context = Rex::Proto::DCERPC::Packet.make_bind_fake_multi(self.handle.uuid[0], self.handle.uuid[1])
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else
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bind, context = Rex::Proto::DCERPC::Packet.make_bind(self.handle.uuid[0], self.handle.uuid[1])
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end
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raise 'make_bind failed' if !bind
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self.write(bind)
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raw_response = self.read()
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response = Rex::Proto::DCERPC::Response.new(raw_response)
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self.last_response = response
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if response.type == 12 or response.type == 15
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if self.last_response.ack_result[context] == 2
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raise "Could not bind to #{self.handle}"
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end
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self.context = context
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else
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raise "Could not bind to #{self.handle}"
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end
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end
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# Perform a DCE/RPC Function Call
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def call(function, data)
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frag_size = data.length
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if options['frag_size']
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frag_size = options['frag_size']
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end
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call_packets = Rex::Proto::DCERPC::Packet.make_request(function, data, frag_size, self.context)
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call_packets.each { |packet|
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self.write(packet)
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}
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raw_response = self.read()
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if (raw_response == nil or raw_response.length == 0)
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raise Rex::Proto::DCERPC::Exceptions::NoResponse
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end
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self.last_response = Rex::Proto::DCERPC::Response.new(raw_response)
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if self.last_response.type == 3
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e = Rex::Proto::DCERPC::Exceptions::Fault.new
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e.fault = self.last_response.status
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raise e
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end
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self.last_response.stub_data
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end
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# Process a DCERPC response packet from a socket
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def self.read_response (socket, timeout=5)
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data = socket.get_once(-1, timeout)
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# We need at least 10 bytes to find the FragLen
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if (! data or data.length() < 10)
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return
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end
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# Pass the first 10 bytes to the constructor
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resp = Rex::Proto::DCERPC::Response.new(data.slice!(0, 10))
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# Something went wrong in the parser...
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if (! resp.frag_len)
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return resp
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end
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# Do we need to read more data?
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if (resp.frag_len > (data.length + 10))
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begin
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data << socket.timed_read(resp.frag_len - data.length - 10, timeout)
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rescue Timeout::Error
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end
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end
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# Still missing some data...
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if (data.length() != resp.frag_len - 10)
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$stderr.puts "Truncated DCERPC response :-("
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return resp
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end
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resp.parse(data)
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return resp
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end
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end
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end
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end
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end
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