From: Per Bothner <per@bothner.com>
To: Mark Raynsford <list+org.sourceware.kawa@io7m.com>, kawa@sourceware.org
Subject: Re: Sandboxing Kawa
Date: Wed, 22 Nov 2017 19:58:00 -0000 [thread overview]
Message-ID: <d89e7045-90b7-5435-234c-d13c85b207de@bothner.com> (raw)
In-Reply-To: <20171122111055.21383f32@copperhead.int.arc7.info>
On 11/22/2017 12:10 PM, Mark Raynsford wrote:
> I have the following questions after playing with the Kawa API a bit:
>
> 1. Is it possible to restrict the initially available symbols in a
> kawa.standard.Scheme instance to a tiny core subset (such as lambda,
> if, define, begin, etc)? A default Scheme instance in Kawa has 807
> symbols in the environment.
The default Kawa environment is defined by the (two) calls to
loadClass("kawa.lib.kawa.base", xxx) in kawa/standard/Scheme.java.
So all of the initially visible names are defined by kawa.lib.kawa.base
(defined in kawa/lib/kawa/base.scm). So you can replace kawa.lib.kawa.base
to a "smaller" initial library.
I suggested creating sub-classes of kawa.standard,Scheme and
kawa.standard.SchemeCompilation.
In addition you need to override checkDefaultBinding from
SchemeCompilation. The easiest and most reliable is just have it return null.
> 2. Is it possible to restrict the interpreter to only working with a
> single java.nio.file.FileSystem? I'd like it if any attempt to do I/O
> went through a given filesystem instance. I don't mind if I have to
> implement my own I/O library to do this.
>
> 3. Is it possible to restrict the classes that the interpreter is
> allowed to access or import? For example, right now nothing stops the
> someone from writing (java.lang.System:exit 0).
Both of these require disabling "backdoors" to Java classes, methods,
fields. Overriding ,checkDefaultBidning and maybe the colon
operator should do that.
--
--Per Bothner
per@bothner.com http://per.bothner.com/
next prev parent reply other threads:[~2017-11-22 19:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-22 11:11 Mark Raynsford
2017-11-22 19:58 ` Per Bothner [this message]
2017-11-22 20:58 ` Mark Raynsford
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