478 lines
11 KiB
Ruby
478 lines
11 KiB
Ruby
##
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# $Id$
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##
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require 'msf/base'
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require 'msf/base/sessions/scriptable'
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require 'rex/post/meterpreter'
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module Msf
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module Sessions
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###
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#
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# This class represents a session compatible interface to a meterpreter server
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# instance running on a remote machine. It provides the means of interacting
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# with the server instance both at an API level as well as at a console level.
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#
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###
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class Meterpreter < Rex::Post::Meterpreter::Client
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include Msf::Session
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#
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# The meterpreter session is interactive
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#
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include Msf::Session::Interactive
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include Msf::Session::Comm
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#
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# This interface supports interacting with a single command shell.
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#
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include Msf::Session::Provider::SingleCommandShell
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include Msf::Session::Scriptable
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# Override for server implementations that can't do ssl
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def supports_ssl?
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true
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end
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def supports_zlib?
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true
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end
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#
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# Initializes a meterpreter session instance using the supplied rstream
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# that is to be used as the client's connection to the server.
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#
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def initialize(rstream, opts={})
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super
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opts[:capabilities] = {
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:ssl => supports_ssl?,
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:zlib => supports_zlib?
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}
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if not opts[:skip_ssl]
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# the caller didn't request to skip ssl, so make sure we support it
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opts.merge!(:skip_ssl => (not supports_ssl?))
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end
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#
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# Initialize the meterpreter client
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#
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self.init_meterpreter(rstream, opts)
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#
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# Create the console instance
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#
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self.console = Rex::Post::Meterpreter::Ui::Console.new(self)
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end
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#
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# Returns the session type as being 'meterpreter'.
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#
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def self.type
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"meterpreter"
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end
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#
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# Calls the class method
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#
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def type
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self.class.type
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end
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##
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# :category: Msf::Session::Provider::SingleCommandShell implementors
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#
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# Create a channelized shell process on the target
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#
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def shell_init
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return true if @shell
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# COMSPEC is special-cased on all meterpreters to return a viable
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# shell.
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sh = fs.file.expand_path("%COMSPEC%")
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@shell = sys.process.execute(sh, nil, { "Hidden" => true, "Channelized" => true })
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end
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##
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# :category: Msf::Session::Provider::SingleCommandShell implementors
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#
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# Read from the command shell.
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#
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def shell_read(length=nil, timeout=1)
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shell_init
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length = nil if length.nil? or length < 0
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begin
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rv = nil
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# Meterpreter doesn't offer a way to timeout on the victim side, so
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# we have to do it here. I'm concerned that this will cause loss
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# of data.
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Timeout.timeout(timeout) {
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rv = @shell.channel.read(length)
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}
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framework.events.on_session_output(self, rv) if rv
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return rv
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rescue ::Timeout::Error
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return nil
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rescue ::Exception => e
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shell_close
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raise e
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end
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end
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##
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# :category: Msf::Session::Provider::SingleCommandShell implementors
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#
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# Write to the command shell.
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#
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def shell_write(buf)
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shell_init
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begin
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framework.events.on_session_command(self, buf.strip)
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len = @shell.channel.write("#{buf}\n")
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rescue ::Exception => e
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shell_close
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raise e
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end
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len
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end
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##
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# :category: Msf::Session::Provider::SingleCommandShell implementors
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#
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# Terminate the shell channel
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#
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def shell_close
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@shell.close
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@shell = nil
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end
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def shell_command(cmd)
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# Send the shell channel's stdin.
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shell_write(cmd + "\n")
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timeout = 5
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etime = ::Time.now.to_f + timeout
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buff = ""
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# Keep reading data until no more data is available or the timeout is
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# reached.
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while (::Time.now.to_f < etime)
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res = shell_read(-1, timeout)
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break unless res
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timeout = etime - ::Time.now.to_f
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buff << res
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end
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buff
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end
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#
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# Called by PacketDispatcher to resolve error codes to names.
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# This is the default version (return the number itself)
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#
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def lookup_error(code)
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"#{code}"
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end
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##
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# :category: Msf::Session overrides
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#
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# Cleans up the meterpreter client session.
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#
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def cleanup
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cleanup_meterpreter
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super
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end
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##
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# :category: Msf::Session overrides
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#
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# Returns the session description.
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#
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def desc
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"Meterpreter"
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end
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##
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# :category: Msf::Session::Scriptable implementors
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#
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# Runs the meterpreter script in the context of a script container
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#
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def execute_file(full_path, args)
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o = Rex::Script::Meterpreter.new(self, full_path)
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o.run(args)
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end
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##
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# :category: Msf::Session::Interactive implementors
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#
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# Initializes the console's I/O handles.
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#
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def init_ui(input, output)
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self.user_input = input
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self.user_output = output
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console.init_ui(input, output)
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console.set_log_source(log_source)
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super
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end
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##
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# :category: Msf::Session::Interactive implementors
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#
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# Resets the console's I/O handles.
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#
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def reset_ui
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console.unset_log_source
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console.reset_ui
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end
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#
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# Terminates the session
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#
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def kill
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begin
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cleanup_meterpreter
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self.sock.close
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rescue ::Exception
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end
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framework.sessions.deregister(self)
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end
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#
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# Run the supplied command as if it came from suer input.
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#
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def queue_cmd(cmd)
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console.queue_cmd(cmd)
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end
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##
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# :category: Msf::Session::Interactive implementors
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#
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# Explicitly runs a command in the meterpreter console.
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#
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def run_cmd(cmd)
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console.run_single(cmd)
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end
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#
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# Load the stdapi extension.
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#
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def load_stdapi()
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original = console.disable_output
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console.disable_output = true
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console.run_single('load stdapi')
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console.disable_output = original
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end
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#
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# Load the priv extension.
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#
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def load_priv()
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original = console.disable_output
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console.disable_output = true
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console.run_single('load priv')
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console.disable_output = original
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end
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#
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# Populate the session information.
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#
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# Also reports a session_fingerprint note for host os normalization.
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#
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def load_session_info()
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begin
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::Timeout.timeout(60) do
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# Gather username/system information
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username = self.sys.config.getuid
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sysinfo = self.sys.config.sysinfo
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safe_info = "#{username} @ #{sysinfo['Computer']}"
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safe_info.force_encoding("ASCII-8BIT") if safe_info.respond_to?(:force_encoding)
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# Should probably be using Rex::Text.ascii_safe_hex but leave
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# this as is for now since "\xNN" is arguably uglier than "_"
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# showing up in various places in the UI.
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safe_info.gsub!(/[\x00-\x08\x0b\x0c\x0e-\x19\x7f-\xff]+/n,"_")
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self.info = safe_info
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# Enumerate network interfaces to detect IP
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ifaces = self.net.config.get_interfaces().flatten rescue []
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routes = self.net.config.get_routes().flatten rescue []
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shost = self.session_host
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# Try to match our visible IP to a real interface
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# TODO: Deal with IPv6 addresses
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found = ifaces.find {|i| i.ip == shost }
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nhost = nil
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hobj = nil
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if Rex::Socket.is_ipv4?(shost) and not found
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# Try to find an interface with a default route
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default_routes = routes.select{ |r| r.subnet == "0.0.0.0" }
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default_routes.each do |r|
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ifaces.each do |i|
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cidr = Rex::Socket.net2bitmask( i.netmask ) rescue "/32"
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rang = Rex::Socket::RangeWalker.new( "#{i.ip}/#{cidr}" ) rescue nil
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if rang and rang.include?( r.gateway )
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nhost = i.ip
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break
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end
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end
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break if nhost
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end
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# Find the first non-loopback address
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if not nhost
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iface = ifaces.select{|i| i.ip != "127.0.0.1" }
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if iface.length > 0
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nhost = iface.first.ip
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end
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end
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end
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# If we found a better IP address for this session, change it up
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# only handle cases where the DB is not connected here
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if not (framework.db and framework.db.active)
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self.session_host = nhost
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end
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# The rest of this requires a database, so bail if it's not
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# there
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return if not (framework.db and framework.db.active)
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wspace = framework.db.find_workspace(workspace)
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# Account for finding ourselves on a different host
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if nhost and self.db_record
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# Create or switch to a new host in the database
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hobj = framework.db.report_host(:workspace => wspace, :host => nhost)
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if hobj
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self.session_host = nhost
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self.db_record.host_id = hobj[:id]
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end
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end
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framework.db.report_note({
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:type => "host.os.session_fingerprint",
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:host => self,
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:workspace => wspace,
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:data => {
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:name => sysinfo["Computer"],
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:os => sysinfo["OS"],
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:arch => sysinfo["Architecture"],
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}
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})
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if self.db_record
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self.db_record.desc = safe_info
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self.db_record.save!
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end
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framework.db.update_host_via_sysinfo(:host => self, :workspace => wspace, :info => sysinfo)
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if nhost
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framework.db.report_note({
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:type => "host.nat.server",
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:host => shost,
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:workspace => wspace,
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:data => { :info => "This device is acting as a NAT gateway for #{nhost}", :client => nhost },
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:update => :unique_data
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})
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framework.db.report_host(:host => shost, :purpose => 'firewall' )
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framework.db.report_note({
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:type => "host.nat.client",
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:host => nhost,
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:workspace => wspace,
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:data => { :info => "This device is traversing NAT gateway #{shost}", :server => shost },
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:update => :unique_data
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})
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framework.db.report_host(:host => nhost, :purpose => 'client' )
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end
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end
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rescue ::Interrupt
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dlog("Interrupt while loading sysinfo: #{e.class}: #{e}")
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raise $!
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rescue ::Exception => e
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# Log the error but otherwise ignore it so we don't kill the
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# session if reporting failed for some reason
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elog("Error loading sysinfo: #{e.class}: #{e}")
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dlog("Call stack:\n#{e.backtrace.join("\n")}")
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end
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end
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##
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# :category: Msf::Session::Interactive implementors
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#
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# Interacts with the meterpreter client at a user interface level.
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#
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def _interact
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framework.events.on_session_interact(self)
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# Call the console interaction subsystem of the meterpreter client and
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# pass it a block that returns whether or not we should still be
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# interacting. This will allow the shell to abort if interaction is
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# canceled.
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console.interact { self.interacting != true }
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# If the stop flag has been set, then that means the user exited. Raise
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# the EOFError so we can drop this bitch like a bad habit.
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raise EOFError if (console.stopped? == true)
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end
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##
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# :category: Msf::Session::Comm implementors
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#
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# Creates a connection based on the supplied parameters and returns it to
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# the caller. The connection is created relative to the remote machine on
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# which the meterpreter server instance is running.
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#
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def create(param)
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sock = nil
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# Notify handlers before we create the socket
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notify_before_socket_create(self, param)
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sock = net.socket.create(param)
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# sf: unsure if we should raise an exception or just return nil. returning nil for now.
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#if( sock == nil )
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# raise Rex::UnsupportedProtocol.new(param.proto), caller
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#end
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# Notify now that we've created the socket
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notify_socket_created(self, sock, param)
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# Return the socket to the caller
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sock
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end
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attr_accessor :platform
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attr_accessor :binary_suffix
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attr_accessor :console # :nodoc:
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attr_accessor :skip_ssl
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attr_accessor :target_id
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protected
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attr_accessor :rstream # :nodoc:
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end
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end
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end
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