flouri.sh

There's very little recent work on the MRI ruby sandbox, so here's a quick guide to getting the sandbox installed and running. Unfortunately, the sandbox requires a patched ruby, but luckily it's not that hard to set up.

1. Download the latest version of ruby 1.8.6 from ftp://ftp.ruby-lang.org/pub/ruby/1.8 (does not work with 1.8.7 or 1.9, sorry)
2. Download the sandbox gem source from git://github.com/why/sandbox.git
3. Patch ruby:
   patch -p1 < ../sandbox_gem/patch/ruby-1.8.6-sandbox_needs.patch
   patching file error.c
4. Compile and install the patched ruby:
   ./configure
make
sudo make install
5. Download and install rubygems from RubyForge
6. Install the sandbox gem:
   cd sandbox_gem && sudo ruby setup.rb
7. Test the sandbox:
   

   require "sandbox"
   Sandbox.safe.eval("2+2")
   # yields 4
   

Now that you've got the sandbox running, read more about it in my article on Advanced Sandboxing, or my Sandbox Introduction.