escape_sequence.rb

#!/usr/bin/env ruby
 
require "rubygems"
require "shikashi"
 
include Shikashi
 
s = Sandbox.new
priv = Privileges.new
 
# allow execution of foo, print, puts in this object
#priv.object(self).allow :foo, :print, :puts, :new
 
priv.methods_of(Kernel).allow :puts
priv.methods_of(Class).allow :new
priv.methods_of(Fixnum).allow :+
 
#inside the sandbox, only can use method foo on main and method times on instances of Fixnum
code = <<-EOS
  # class MP
  class MP
    def calc(a,b)
      a + b
    end
 
    def test(a)
      c = calc(10,20)
      puts c
      puts "inside test \#{c}"
      if (a)
        system('ls -l') # denied
      end
    end
  end
 
  #include AtlasMP
  #test
  MP.new.test(false)
 
EOS
 
s.run(code, priv)