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From Jason Smith <>
Subject Re: Branch to switch from SpiderMonkey to Node.js
Date Thu, 31 Jan 2013 16:54:45 GMT
On Thu, Jan 31, 2013 at 4:34 PM, Benoit Chesneau <>wrote:

> A javascript engine doesn't expose any IO par default. The **framework**
> nodejs is, this is all the point. I'm quite interested by the existing
> solutions to sandbox nodejs, do you know some projects that does it?

Correct. I am attempting to build something which satisfies your
description: no i/o; i/o is not even possible.

*How* is it implemented? Well, it doesn't matter whether we use Node.js or
couchjs/SM or couchjs/v8. What matters is we feel confident about security.
And of course, I agree, if we cannot achieve good security, then that is a
show stopper.

Here is my current plan for sandboxing CouchJS. (Thanks to Isaac for his

When it is time to evaluate some code:

1. Set up an object with safe variable bindings: safe_context
2. fork()
3. Child process runs vm.runInNewContext(safe_context)
4. Child process communicates to the parent over stdio, through the
approved safe_context functions

The subprocess can also give extra sandboxing, such as chroot() if

Yes, this causes two processes per instantiation; however I think the
parent might only be short-lived, setting up the security, then exiting.
The grandchild can talk to Erlang over stdio.

That is my plan. No idea how well it will work.

Iris Couch

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