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#!/usr/bin/env ruby
msfbase = File.symlink?(__FILE__) ? File.readlink(__FILE__) : __FILE__
$:.unshift(File.join(File.dirname(msfbase), 'lib'))
require 'rex'
require 'msf/ui'
require 'msf/base'
OutStatus = "[*] "
OutError = "[-] "
$args = Rex::Parser::Arguments.new(
"-i" => [ true, "Encode the contents of the supplied file path" ],
"-a" => [ true, "The architecture to encode as" ],
"-t" => [ true, "The format to display the encoded buffer with (raw, ruby, perl, c)" ],
"-b" => [ true, "The list of characters to avoid: '\\x00\\xff'" ],
"-s" => [ true, "The maximum size of the encoded data" ],
"-e" => [ true, "The encoder to use" ],
"-n" => [ false, "Dump encoder information" ],
"-h" => [ false, "Help banner" ],
"-l" => [ false, "List available encoders" ])
#
# 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
# Initialize the simplified framework instance.
$framework = Msf::Simple::Framework.create
# Defaults
cmd = "encode"
arch = nil
badchars = ''
space = nil
encoder = nil
fmt = "c"
input = $stdin
options = ''
delim = '_|_'
# Parse the argument and rock that shit.
$args.parse(ARGV) { |opt, idx, val|
case opt
when "-i"
begin
input = File.new(val)
rescue
$stderr.puts(OutError + "Failed to open file #{val}: #{$!}")
exit
end
when "-l"
cmd = "list"
when "-n"
cmd = "dump"
when "-a"
arch = val
when "-b"
badchars = Rex::Text.hex_to_raw(val)
when "-s"
space = val.to_i
when "-t"
if (val =~ /^(perl|ruby|raw|c)$/)
fmt = val
else
$stderr.puts(OutError + "Invalid format: #{val}")
exit
end
when "-e"
encoder = val
when "-h"
usage
else
if (val =~ /=/)
options += ((options.length > 0) ? delim : "") + "#{val}"
end
end
}
# 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"
buf = input.read
encoders.each { |enc|
next if not enc
begin
# Imports options
enc.datastore.import_options_from_s(options, delim)
# Encode it upt
raw = enc.encode(buf, badchars)
# 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})")
next
end
# Print it out
$stderr.puts(OutStatus + "#{enc.refname} succeeded, final size #{raw.length}\n\n")
$stdout.print(Msf::Simple::Buffer.transform(raw, fmt))
exit
rescue
$stderr.puts(OutError + "#{enc.refname} failed: #{$!}")
end
}
$stderr.puts(OutError + "No encoders succeeded.")
end
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