[IronPython] restrict scripting access

Dody Gunawinata empirebuilder at gmail.com
Mon Jun 30 06:30:41 PDT 2008


Ah, true. If there's an effort to create a sandbox mode, please also
consider time out scenarios so we don't have infite loops causing much
damage.

On Mon, Jun 30, 2008 at 3:35 PM, Michael Foord <fuzzyman at voidspace.org.uk>
wrote:

> Dody Gunawinata wrote:
>
>> That you can filter our from the python source code or replace such call
>> with exception ("bzz, can't load AddReference") - Yeah, it's a pretty nasty
>> workaround, but it works.
>>
>
> Unfortunately not - one of the disadvantages of a highly dynamic language.
> There are lots of alternative ways of getting at the functionality.
>
> Using the __import__ function instead of import. Using getattr with strings
> instead of including the literals in the source code. etc etc
>
> It is for these reasons that the rexec module was deprecated in CPython, it
> is basically impossible to prevent access to certain builtin features. You
> have to apply the restrictions from the 'outside'.
>
> Michael
>
>
>> Dody G.
>>
>> On Mon, Jun 30, 2008 at 3:26 PM, Michael Foord <fuzzyman at voidspace.org.uk<mailto:
>> fuzzyman at voidspace.org.uk>> wrote:
>>
>>    Dody Gunawinata wrote:
>>
>>        In the IronPython hosting API, unless you specifically load
>>        the assembly, it will not be accessible through the script. So
>>        right now restricting access means configuring the assemblies
>>        you want to expose to the script.
>>
>>
>>    But what is to stop the user code doing:
>>
>>    import clr
>>    clr.AddReference('SomeAssembly')
>>
>>    Loading the ScriptRuntime into an AppDomain and restricting the
>>    privileges on that is one way - but I don't think that IronPython
>>    will work at all unless the AppDomain has pretty much full trust.
>>
>>    Michael Foord
>>
>>        On Mon, Jun 30, 2008 at 3:09 PM, Ben Hall
>>        <ben2004uk at googlemail.com <mailto:ben2004uk at googlemail.com>
>>        <mailto:ben2004uk at googlemail.com
>>        <mailto:ben2004uk at googlemail.com>>> wrote:
>>
>>           I thought this last night, it would be really useful if we
>>        could
>>           'sandbox' the IP engine and limit it's access to certain
>>        areas of the
>>           framework.
>>
>>
>>
>>           On Mon, Jun 30, 2008 at 12:57 PM, Rainer Worbis
>>           <r.worbis at cubido.at <mailto:r.worbis at cubido.at>
>>        <mailto:r.worbis at cubido.at <mailto:r.worbis at cubido.at>>> wrote:
>>           > No - for example i would like to prevent that the user loads
>>           assemblies and does own data access via System.Data.SqlClient.
>>           > Or uses specific parts of the applications. (which should be
>>           visible to other scripts). So access control per script
>>        would be
>>           optimal.
>>           >
>>           > Rainer
>>           >
>>           > -----Ursprüngliche Nachricht-----
>>           > Von: users-bounces at lists.ironpython.com
>>        <mailto:users-bounces at lists.ironpython.com>
>>           <mailto:users-bounces at lists.ironpython.com
>>        <mailto:users-bounces at lists.ironpython.com>>
>>           [mailto:users-bounces at lists.ironpython.com
>>
>>        <mailto:users-bounces at lists.ironpython.com>
>>           <mailto:users-bounces at lists.ironpython.com
>>        <mailto:users-bounces at lists.ironpython.com>>] Im Auftrag von
>>           Korbinian Abenthum
>>           > Gesendet: Montag, 30. Juni 2008 13:47
>>           > An: Discussion of IronPython
>>           > Betreff: Re: [IronPython] restrict scripting access
>>           >
>>           > Rainer Worbis wrote:
>>           >> is there a way to restrict access to objects or namespaces
>>           >> within a script? We use IronPython for providing scripting
>>           >> functionality within our .NET Application but would like to
>>           >> restrict access to certain functions. Has anybody
>>        information
>>           >> or a sample how to do that?
>>           >
>>           > Can you declare the restricted objects as "internal"?
>>           >
>>           > Cheers,
>>           >  Korbinian
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