102 lines
3.4 KiB
Ruby
102 lines
3.4 KiB
Ruby
module Msf
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module Handler
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# Options and methods needed for all handlers that listen for a connection
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# from the payload.
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module Reverse
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autoload :Comm, 'msf/core/handler/reverse/comm'
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autoload :SSL, 'msf/core/handler/reverse/ssl'
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def initialize(info = {})
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super
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register_options(
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[
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Opt::LHOST,
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Opt::LPORT(4444)
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], Msf::Handler::Reverse)
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register_advanced_options(
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[
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OptPort.new('ReverseListenerBindPort', [false, 'The port to bind to on the local system if different from LPORT']),
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OptBool.new('ReverseAllowProxy', [ true, 'Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST', false]),
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], Msf::Handler::Reverse
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)
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end
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# A list of addresses to attempt to bind, in preferred order.
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#
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# @return [Array<String>] a two-element array. The first element will be
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# the address that `datastore['LHOST']` resolves to, the second will
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# be the INADDR_ANY address for IPv4 or IPv6, depending on the version
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# of the first element.
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def bind_addresses
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# Switch to IPv6 ANY address if the LHOST is also IPv6
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addr = Rex::Socket.resolv_nbo(datastore['LHOST'])
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# First attempt to bind LHOST. If that fails, the user probably has
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# something else listening on that interface. Try again with ANY_ADDR.
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any = (addr.length == 4) ? "0.0.0.0" : "::0"
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addrs = [ Rex::Socket.addr_ntoa(addr), any ]
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if not datastore['ReverseListenerBindAddress'].to_s.empty?
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# Only try to bind to this specific interface
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addrs = [ datastore['ReverseListenerBindAddress'] ]
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# Pick the right "any" address if either wildcard is used
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addrs[0] = any if (addrs[0] == "0.0.0.0" or addrs == "::0")
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end
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addrs
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end
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# @return [Integer]
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def bind_port
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port = datastore['ReverseListenerBindPort'].to_i
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(port > 0) ? port : datastore['LPORT'].to_i
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end
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#
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# Starts the listener but does not actually attempt
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# to accept a connection. Throws socket exceptions
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# if it fails to start the listener.
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#
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def setup_handler
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if !datastore['Proxies'].blank? && !datastore['ReverseAllowProxy']
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raise RuntimeError, "TCP connect-back payloads cannot be used with Proxies. Use 'set ReverseAllowProxy true' to override this behaviour."
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end
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ex = false
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comm = select_comm
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local_port = bind_port
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bind_addresses.each do |ip|
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begin
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self.listener_sock = Rex::Socket::TcpServer.create(
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'LocalHost' => ip,
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'LocalPort' => local_port,
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'Comm' => comm,
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'Context' =>
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{
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'Msf' => framework,
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'MsfPayload' => self,
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'MsfExploit' => assoc_exploit
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})
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rescue
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ex = $!
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print_error("Handler failed to bind to #{ip}:#{local_port}:- #{comm} -")
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else
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ex = false
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via = via_string_for_ip(ip, comm)
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print_status("Started #{human_name} handler on #{ip}:#{local_port} #{via}")
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break
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end
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end
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raise ex if (ex)
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end
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end
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end
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end
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