dwelch-r7
158 lines
3.6 KiB
Ruby
158 lines
3.6 KiB
Ruby
# -*- coding: binary -*-
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module Msf
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module Handler
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###
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#
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# This handler implements the SSH tunneling interface.
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#
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###
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module ReverseSsh
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include Msf::Handler
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include Msf::Handler::Reverse
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#
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# Returns the string representation of the handler type
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#
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def self.handler_type
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return 'reverse_ssh'
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end
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#
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# Returns the connection-described general handler type, in this case
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# 'tunnel'.
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#
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def self.general_handler_type
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"tunnel"
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end
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# Initializes the reverse SSH handler and ads the options that are required
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# for all reverse SSH payloads, like version string and auth params.
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#
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def initialize(info = {})
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super
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register_options([Opt::LPORT(22)])
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register_advanced_options(
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[
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OptString.new('Ssh::Version', [
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true,
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'The SSH version string to provide',
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Rex::Proto::Ssh::Connection.default_options['local_version']
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])
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], Msf::Handler::ReverseSsh
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)
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end
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# A URI describing where we are listening
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#
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# @param addr [String] the address that
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# @return [String] A URI of the form +ssh://host:port/+
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def listener_uri(addr=datastore['ReverseListenerBindAddress'])
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addr = datastore['LHOST'] if addr.nil? || addr.empty?
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uri_host = Rex::Socket.is_ipv6?(addr) ? "[#{addr}]" : addr
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"ssh://#{uri_host}:#{bind_port}"
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end
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# Create an Ssh listener
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#
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# @return [void]
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def setup_handler
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local_addr = nil
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local_port = bind_port
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ex = false
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ssh_opts = Rex::Proto::Ssh::Connection.default_options
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ssh_opts['local_version'] = datastore['Ssh::Version']
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# Start the SSH server service on this host/port
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bind_addresses.each do |ip|
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begin
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self.service = Rex::ServiceManager.start(Rex::Proto::Ssh::Server,
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local_port, ip,
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{
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'Msf' => framework,
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'MsfExploit' => self,
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},
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comm,
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ssh_opts
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)
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local_addr = ip
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rescue
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ex = $!
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print_error("Handler failed to bind to #{ip}:#{local_port}")
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else
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ex = false
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break
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end
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end
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self.service.on_client_connect_proc = Proc.new {|cli| init_fd_client(cli)}
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raise ex if (ex)
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print_status("Started SSH reverse handler on #{listener_uri(local_addr)}")
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if datastore['IgnoreUnknownPayloads']
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print_status("Handler is ignoring unknown payloads")
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end
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end
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# Stops the handler & service
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#
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# @return [void]
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def stop_handler
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if self.service
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if self.sessions == 0
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Rex::ServiceManager.stop_service(self.service)
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end
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end
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end
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def init_fd_client(cli)
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begin
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Timeout::timeout(5) do
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while cli.connection.open_channel_keys.empty? do
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sleep 0.02
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end
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fdc = Rex::Proto::Ssh::ChannelFD.new(cli)
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self.service.clients.push(fdc)
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create_session(fdc)
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end
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rescue Timeout::Error
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elog("Unable to find channel FDs for client #{cli}")
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end
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end
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def create_session(ssh,opts={})
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# If there is a parent payload, then use that in preference.
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s = Sessions::SshCommandShell.new(ssh,opts)
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# Pass along the framework context
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s.framework = framework
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# Associate this system with the original exploit
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# and any relevant information
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s.set_from_exploit(assoc_exploit)
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# If the session is valid, register it with the framework and
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# notify any waiters we may have.
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if (s)
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register_session(s)
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end
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return s
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end
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#
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# Always wait at least 5 seconds for this payload (due to channel delays)
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#
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def wfs_delay
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datastore['WfsDelay'] > 4 ? datastore['WfsDelay'] : 5
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end
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attr_accessor :service # :nodoc:
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end
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end
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end
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