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#!/usr/bin/env ruby
# -*- coding: binary -*-
#
# $Id$
# $Revision$
#

msfbase = __FILE__
while File.symlink?(msfbase)
msfbase = File.expand_path(File.readlink(msfbase), File.dirname(msfbase))
end

$:.unshift(File.expand_path(File.join(File.dirname(msfbase), 'lib')))
require 'fastlib'
require 'msfenv'



$:.unshift(ENV['MSF_LOCAL_LIB']) if ENV['MSF_LOCAL_LIB']

require 'rex'
require 'msf/ui'
require 'msf/base'

OutStatus = "[*] "
OutError = "[-] "

# Load supported formats
supported_formats = Msf::Simple::Buffer.transform_formats + Msf::Util::EXE.to_executable_fmt_formats

$args = Rex::Parser::Arguments.new(
"-h" => [ false, "Help banner" ],
"-l" => [ false, "List available encoders" ],
"-v" => [ false, "Increase verbosity" ],
# input/output
"-i" => [ true, "Encode the contents of the supplied file path" ],
"-m" => [ true, "Specifies an additional module search path" ],
"-o" => [ true, "The output file" ],
# architecture/platform
"-a" => [ true, "The architecture to encode as" ],
"-p" => [ true, "The platform to encode for" ],
# format options
"-t" => [ true, "The output format: #{supported_formats.join(',')}" ],
# encoder options
"-e" => [ true, "The encoder to use" ],
"-n" => [ false, "Dump encoder information" ],
"-b" => [ true, "The list of characters to avoid: '\\x00\\xff'" ],
"-s" => [ true, "The maximum size of the encoded data" ],
"-c" => [ true, "The number of times to encode the data" ],
# EXE generation options
"-d" => [ true, "Specify the directory in which to look for EXE templates" ],
"-x" => [ true, "Specify an alternate executable template" ],
"-k" => [ false, "Keep template working; run payload in new thread (use with -x)" ]
)

#
# Dump the list of encoders
#
def dump_encoders(arch = nil)
tbl = Rex::Ui::Text::Table.new(
'Indent' => 4,
'Header' => "Framework Encoders" + ((arch) ? " (architectures: #{arch})" : ""),
'Columns' =>
[
"Name",
"Rank",
"Description"
])
cnt = 0

$framework.encoders.each_module(
'Arch' => arch ? arch.split(',') : nil) { |name, mod|
tbl << [ name, mod.rank_to_s, mod.new.name ]

cnt += 1
}

(cnt > 0) ? "\n" + tbl.to_s + "\n" : "\nNo compatible encoders found.\n\n"
end

#
# Returns the list of encoders to try
#
def get_encoders(arch, encoder)
encoders = []

if (encoder)
encoders << $framework.encoders.create(encoder)
else
$framework.encoders.each_module_ranked(
'Arch' => arch ? arch.split(',') : nil) { |name, mod|
encoders << mod.new
}
end

encoders
end

#
# Nuff said.
#
def usage
$stderr.puts("\n" + " Usage: #{$0} <options>\n" + $args.usage)
exit
end

def write_encoded(buf)
if (not $output)
$stdout.write(buf)
else
File.open($output, "wb") do |fd|
fd.write(buf)
end
end
end

# Defaults
verbose = 0
cmd = "encode"
arch = nil
badchars = ''
space = nil
encoder = nil
fmt = nil
input = $stdin
options = ''
delim = '_|_'
output = nil
ecount = 1
plat = nil

altexe = nil
inject = false
exedir = nil # use default

# Parse the argument and rock that shit.
$args.parse(ARGV) { |opt, idx, val|
case opt
when "-i"
begin
input = File.open(val, 'rb')
rescue
$stderr.puts(OutError + "Failed to open file #{val}: #{$!}")
exit
end
when "-m"
$framework.modules.add_module_path(val)
when "-l"
cmd = "list"
when "-n"
cmd = "dump"
when "-a"
arch = val
when "-c"
ecount = val.to_i
when "-b"
badchars = Rex::Text.hex_to_raw(val)
when "-p"
plat = Msf::Module::PlatformList.transform(val)
when "-s"
space = val.to_i
when "-t"
if supported_formats.include?(val)
fmt = val
else
$stderr.puts(OutError + "Invalid format: #{val}")
exit
end
when "-o"
$output = val
when "-e"
encoder = val

when "-d"
exedir = val
when "-x"
altexe = val
when "-k"
inject = true

when "-h"
usage

when "-v"
verbose += 1

else
if (val =~ /=/)
options += ((options.length > 0) ? delim : "") + "#{val}"
end
end
}


if(not fmt and output)
pre,ext = output.split('.')
if(ext and not ext.empty?)
fmt = ext
end
end

if inject and not altexe
$stderr.puts "[*] Error: the injection option must use a custom EXE template via -x, otherwise the injected payload will immediately exit when the main process dies."
exit(1)
end
exeopts = {
:inject => inject,
:template => altexe,
:template_path => exedir
}

# Initialize the simplified framework instance.
$framework = Msf::Simple::Framework.create(
:module_types => [ Msf::MODULE_ENCODER, Msf::MODULE_NOP ],
'DisableDatabase' => true
)

# Get the list of encoders to try
encoders = get_encoders(arch, encoder)

# Process the actual command
case cmd
when "list"
$stderr.puts(dump_encoders(arch))
when "dump"
enc = encoder ? $framework.encoders.create(encoder) : nil

if (enc)
$stderr.puts(Msf::Serializer::ReadableText.dump_module(enc))
else
$stderr.puts(OutError + "Invalid encoder specified.")
end
when "encode"
input.binmode # ensure its in binary mode
buf = input.read

encoders.each { |enc|
next if not enc
begin
# Imports options
enc.datastore.import_options_from_s(options, delim)

skip = false
eout = buf.dup
raw = nil

1.upto(ecount) do |iteration|

# Encode it up
raw = enc.encode(eout, badchars, nil, plat)

# Is it too big?
if (space and space > 0 and raw.length > space)
$stderr.puts(OutError + "#{enc.refname} created buffer that is too big (#{raw.length})")
skip = true
break
end

# Print it out
$stderr.puts(OutStatus + "#{enc.refname} succeeded with size #{raw.length} (iteration=#{iteration})\n\n")
eout = raw
end

next if skip

output = Msf::Util::EXE.to_executable_fmt($framework, arch, plat, raw, fmt, exeopts)

if not output
fmt ||= "ruby"
output = Msf::Simple::Buffer.transform(raw, fmt)
end

if exeopts[:fellback]
$stderr.puts(OutError + "Warning: Falling back to default template: #{exeopts[:fellback]}")
end

write_encoded(output)

exit

#
# These exception codes are fatal, we shouldn't expect them to succeed on the next
# iteration, nor the next encoder.
#
rescue ::Errno::ENOENT, ::Errno::EINVAL
$stderr.puts(OutError + "#{enc.refname} failed: #{$!}")
break

rescue => e
$stderr.puts(OutError + "#{enc.refname} failed: #{e}")
if verbose > 0
e.backtrace.each { |el|
$stderr.puts(OutError + el.to_s)
}
end
end
}

$stderr.puts(OutError + "No encoders succeeded.")
end
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