Class: Rex::Proto::DCERPC::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/proto/dcerpc/client.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(handle, socket, useroptions = Hash.new) ⇒ Client

initialize a DCE/RPC Function Call

Raises:



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# File 'lib/rex/proto/dcerpc/client.rb', line 15

def initialize(handle, socket, useroptions = Hash.new)
	self.handle = handle
	self.socket = socket
	self.options = {
		'smb_user'   => '',
		'smb_pass'   => '',
		'smb_pipeio' => 'rw',
		'smb_name'   => nil,
		'read_timeout'    => 10,
		'connect_timeout' => 5
	}

	self.options.merge!(useroptions)

	# If the caller passed us a smb_client object, use it and
	# and skip the connect/login/ipc$ stages of the setup
	if (self.options['smb_client'])
		self.smb = self.options['smb_client']
	end

	# we must have a valid handle, regardless of everything else
	raise ArgumentError, 'handle is not a Rex::Proto::DCERPC::Handle' if !self.handle.is_a?(Rex::Proto::DCERPC::Handle)

	# we do this in case socket needs setup first, ie, socket = nil
	if !self.options['no_socketsetup']
		self.socket_check()
	end

	raise ArgumentError, 'socket can not read' if !self.socket.respond_to?(:read)
	raise ArgumentError, 'socket can not write' if !self.socket.respond_to?(:write)

	if !self.options['no_autobind']
		self.bind()
	end
end

Instance Attribute Details

#context ⇒ Object

Returns the value of attribute context.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def context
  @context
end

#handle ⇒ Object

Returns the value of attribute handle.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def handle
  @handle
end

#ispipe ⇒ Object

Returns the value of attribute ispipe.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def ispipe
  @ispipe
end

#last_response ⇒ Object

Returns the value of attribute last_response.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def last_response
  @last_response
end

#no_bind ⇒ Object

Returns the value of attribute no_bind.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def no_bind
  @no_bind
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def options
  @options
end

#smb ⇒ Object

Returns the value of attribute smb.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def smb
  @smb
end

#socket ⇒ Object

Returns the value of attribute socket.



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# File 'lib/rex/proto/dcerpc/client.rb', line 12

def socket
  @socket
end

Class Method Details

.read_response(socket, timeout = ) ⇒ Object

Process a DCERPC response packet from a socket



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# File 'lib/rex/proto/dcerpc/client.rb', line 321

def self.read_response(socket, timeout=self.options['read_timeout'])

	data = socket.get_once(-1, timeout)

	# We need at least 10 bytes to find the FragLen
	if (! data or data.length() < 10)
		return
	end

	# Pass the first 10 bytes to the constructor
	resp = Rex::Proto::DCERPC::Response.new(data.slice!(0, 10))

	# Something went wrong in the parser...
	if (! resp.frag_len)
		return resp
	end

	# Do we need to read more data?
	if (resp.frag_len > (data.length + 10))
		begin
			data << socket.timed_read(resp.frag_len - data.length - 10, timeout)
		rescue Timeout::Error
		end
	end

	# Still missing some data...
	if (data.length() != resp.frag_len - 10)
		# TODO: Bubble this up somehow
		# $stderr.puts "Truncated DCERPC response :-("
		return resp
	end

	resp.parse(data)
	return resp
end

Instance Method Details

#bind ⇒ Object 



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# File 'lib/rex/proto/dcerpc/client.rb', line 236

def bind()
	require 'rex/proto/dcerpc/packet'
	bind = ''
	context = ''
	if self.options['fake_multi_bind']

		args = [ self.handle.uuid[0], self.handle.uuid[1] ]

		if (self.options['fake_multi_bind_prepend'])
			args << self.options['fake_multi_bind_prepend']
		end

		if (self.options['fake_multi_bind_append'])
			args << self.options['fake_multi_bind_append']
		end

		bind, context = Rex::Proto::DCERPC::Packet.make_bind_fake_multi(*args)
	else
		bind, context = Rex::Proto::DCERPC::Packet.make_bind(self.handle.uuid[0], self.handle.uuid[1])
	end

	raise 'make_bind failed' if !bind

	self.write(bind)
	raw_response = self.read()

	response = Rex::Proto::DCERPC::Response.new(raw_response)
	self.last_response = response
	if response.type == 12 or response.type == 15
		if self.last_response.ack_result[context] == 2
			raise "Could not bind to #{self.handle}"
		end
		self.context = context
	else
		raise "Could not bind to #{self.handle}"
	end
end

#call(function, data, do_recv = true) ⇒ Object

Perform a DCE/RPC Function Call



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# File 'lib/rex/proto/dcerpc/client.rb', line 275

def call(function, data, do_recv = true)

	frag_size = data.length
	if options['frag_size']
		frag_size = options['frag_size']
	end
	object_id = ''
	if options['object_call']
		object_id = self.handle.uuid[0]
	end
	if options['random_object_id']
		object_id = Rex::Proto::DCERPC::UUID.uuid_unpack(Rex::Text.rand_text(16))
	end

	call_packets = Rex::Proto::DCERPC::Packet.make_request(function, data, frag_size, self.context, object_id)
	call_packets.each { |packet|
		self.write(packet)
	}

	return true if not do_recv

	raw_response = ''

	begin
		raw_response = self.read()
	rescue ::EOFError
		raise Rex::Proto::DCERPC::Exceptions::NoResponse
	end

	if (raw_response == nil or raw_response.length == 0)
		raise Rex::Proto::DCERPC::Exceptions::NoResponse
	end


	self.last_response = Rex::Proto::DCERPC::Response.new(raw_response)

	if self.last_response.type == 3
		e = Rex::Proto::DCERPC::Exceptions::Fault.new
		e.fault = self.last_response.status
		raise e
	end

	self.last_response.stub_data
end

#read ⇒ Object 



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# File 'lib/rex/proto/dcerpc/client.rb', line 133

def read()

	max_read = self.options['pipe_read_max_size'] || 1024*1024
	min_read = self.options['pipe_read_min_size'] || max_read

	raw_response = ''

	# Are we reading from a remote pipe over SMB?
	if (self.socket.class == Rex::Proto::SMB::SimpleClient::OpenPipe)
		begin

			# Max SMB read is 65535, cap it at 64000
			max_read = [64000, max_read].min
			min_read = [64000, min_read].min

			read_limit = nil

			while(true)
				# Random read offsets will not work on Windows NT 4.0 (thanks Dave!)

				read_cnt = (rand(max_read-min_read)+min_read)
				if(read_limit)
					if(read_cnt + raw_response.length > read_limit)
						read_cnt = raw_response.length - read_limit
					end
				end

				data = self.socket.read( read_cnt, rand(1024)+1)
				break if !(data and data.length > 0)
				raw_response += data

				# Keep reading until we have at least the DCERPC header
				next if raw_response.length < 10

				# We now have to process the raw_response and parse out the DCERPC fragment length
				# if we have read enough data. Once we have the length value, we need to make sure
				# that we don't read beyond this amount, or it can screw up the SMB state
				if (not read_limit)
					begin
						check = Rex::Proto::DCERPC::Response.new(raw_response)
						read_limit = check.frag_len
					rescue ::Rex::Proto::DCERPC::Exceptions::InvalidPacket
					end
				end
				break if (read_limit and read_limit <= raw_response.length)
			end

		rescue Rex::Proto::SMB::Exceptions::NoReply
			# I don't care if I didn't get a reply...
		rescue Rex::Proto::SMB::Exceptions::ErrorCode => exception
			if exception.error_code != 0xC000014B
				raise exception
			end
		end
	# This must be a regular TCP or UDP socket
	else
		if (self.socket.type? == 'tcp')
			if (false and max_read)
				while (true)
					data = self.socket.get_once((rand(max_read-min_read)+min_read), self.options['read_timeout'])
					break if not data
					break if not data.length
					raw_response << data
				end
			else
				# Just read the entire response in one go
				raw_response = self.socket.get_once(-1, self.options['read_timeout'])
			end
		else
			# No segmented read support for non-TCP sockets
			raw_response = self.socket.read(0xFFFFFFFF / 2 - 1)  # read max data
		end
	end

	raw_response
end

#smb_connect ⇒ Object 



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# File 'lib/rex/proto/dcerpc/client.rb', line 112

def smb_connect()
	require 'rex/proto/smb/simpleclient'

	if(not self.smb)
		if self.socket.peerport == 139
			smb = Rex::Proto::SMB::SimpleClient.new(self.socket)
		else
			smb = Rex::Proto::SMB::SimpleClient.new(self.socket, true)
		end

		smb.('*SMBSERVER', self.options['smb_user'], self.options['smb_pass'])
		smb.connect("\\\\#{self.handle.address}\\IPC$")
		self.smb = smb
		self.smb.read_timeout = self.options['read_timeout']
	end

	f = self.smb.create_pipe(self.handle.options[0])
	f.mode = self.options['smb_pipeio']
	self.socket = f
end

#socket_check ⇒ Object 



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# File 'lib/rex/proto/dcerpc/client.rb', line 51

def socket_check()
	if self.socket == nil
		self.socket_setup()
	end

	case self.handle.protocol
		when 'ncacn_ip_tcp'
			if self.socket.type? != 'tcp'
				raise "ack, #{self.handle.protocol} requires socket type tcp, not #{self.socket.type?}!"
			end
		when 'ncacn_np'
			if self.socket.class == Rex::Proto::SMB::SimpleClient::OpenPipe
				self.ispipe = 1
			elsif self.socket.type? == 'tcp'
				self.smb_connect()
			else
				raise "ack, #{self.handle.protocol} requires socket type tcp, not #{self.socket.type?}!"
			end
			# No support ncacn_ip_udp (is it needed now that its ripped from Vista?)
		else
			raise "Unsupported protocol : #{self.handle.protocol}"
	end
end

#socket_setup ⇒ Object

Create the appropriate socket based on protocol



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# File 'lib/rex/proto/dcerpc/client.rb', line 76

def socket_setup()
	ctx = { 'Msf' => self.options['Msf'], 'MsfExploit' => self.options['MsfExploit'] }
	self.socket = case self.handle.protocol

		when 'ncacn_ip_tcp'
			Rex::Socket.create_tcp(
				'PeerHost' => self.handle.address,
				'PeerPort' => self.handle.options[0],
				'Context' => ctx,
				'Timeout' => self.options['connect_timeout']
			)

		when 'ncacn_np'
			begin
				socket = Rex::Socket.create_tcp(
					'PeerHost' => self.handle.address,
					'PeerPort' => 445,
					'Context' => ctx,
					'Timeout' => self.options['connect_timeout']
				)
			rescue ::Timeout::Error, Rex::ConnectionRefused
				socket = Rex::Socket.create_tcp(
					'PeerHost' => self.handle.address,
					'PeerPort' => 139,
					'Context' => ctx,
					'Timeout' => self.options['connect_timeout']
				)
			end
			socket
		else nil
	end

	# Add this socket to the exploit's list of open sockets
	options['MsfExploit'].add_socket(self.socket) if (options['MsfExploit'])
end

#write(data) ⇒ Object

Write data to the underlying socket, limiting the sizes of the writes based on the pipe_write_min / pipe_write_max options.



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# File 'lib/rex/proto/dcerpc/client.rb', line 212

def write(data)

	max_write = self.options['pipe_write_max_size'] || data.length
	min_write = self.options['pipe_write_min_size'] || max_write

	if(min_write > max_write)
		max_write = min_write
	end

	idx = 0

	if (self.socket.class == Rex::Proto::SMB::SimpleClient::OpenPipe)
		while(idx < data.length)
			bsize = (rand(max_write-min_write)+min_write).to_i
			len = self.socket.write(data[idx, bsize], rand(1024)+1)
			idx += bsize
		end
	else
		self.socket.write(data)
	end

	data.length
end