Sandbox

> On 2 May 2011 05:15, Casey Ransberger <[hidden email]> wrote:
>>
>> Hello all, I hope this is the right list for this question.
>>
>> I want very much to know more about the sandbox functionality in the Squeak VM. Are there any resources out there that can help me understand how this works?
>>
>> My *real* question was "can this be made to work usefully with the JIT VM?" but I realized that it would be better to ask for pointers about the sandbox and see if I can maybe ask some more informed/specific questions about the JIT and the sandbox later.
>>
>
> JIT changes nothing in this regard, since it works seamlessly and
> there is no extended functionality which may cause more
> security risks comparing to interpreter.
>
>> I'd rather understand it than get the answer, I guess:)
>
> You should start looking at security plugin first.
> Not long ago i added an extra primitives to disable the module loading
> mechanism for the rest of the session.
>
> So, the scheme how to use it is following:
> - at image startup , you forcely loading all modules you may want to
> use , by issuing
>
> Smalltalk loadModule: 'moduleName'
>
> per each module you want.
>
> And then immediately after that  you disabling the module loading by issuing:
>
> Smalltalk disableModuleLoading.
>
> In this way, any code in image, which using primitives from modules
> which not were loaded before will fail.
> This applies not only to external modules, but also to internal ones.
> For instance if you not loaded a socket plugin, and disabled module
> loading before first use of it, you won't be able to
> use it for the rest of the session and therefore you don't need to
> care about security issues from that side.
>
> So, in addition to security plugin, which tries to control various
> security options for some plugins (like files and sockets),
> a new mechanism makes sure that you cannot escape sandboxed mode by
> using some untrusted module which could contain a potential
> security holes and therefore could compromise a system security.
>
> Here the platform code which enabling new functionality:
>
> https://gitorious.org/cogvm/blessed/commit/ca86f61967a21a9ae13642ad70596451c0f91b61
>
> a corresponding primitives integrated into VMMaker-oscog since
> VMMaker-oscog-IgorStasenko.54
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>