Securize: Increase isolation by stripping away prototypes#350
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dmsnell wants to merge 1 commit intoviebel:masterfrom
Open
Securize: Increase isolation by stripping away prototypes#350dmsnell wants to merge 1 commit intoviebel:masterfrom
dmsnell wants to merge 1 commit intoviebel:masterfrom
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When we assign our new `(secured-eval)` we've been allowing the `window`
property to bleed through as `this`. Additionally we have been setting
our forbidden symbols as the empty object `{}` which also exposes the
`Object` prototype.
In this patch we're replacing both of those in an attempt to further
limit the extent to which scripts can access global data.
The downside to this approach is that we've lost all prototypes that we
want, such as `Array.prototype.map`. The severity of this limitation is
so high that it's probably unmergable, but I'm hoping there might still
be a way to resolve that.
dmsnell
commented
Sep 25, 2019
| (set! eval-in-global-scope js/eval) | ||
| (j/assoc! js/window :klipse_unsecured_eval original-eval) | ||
| (j/assoc! js/window :klipse_eval_sandbox (clj->js (zipmap the-forbidden-symbols (repeat {})))) | ||
| (j/assoc! js/window :klipse_eval_sandbox (clj->js (zipmap the-forbidden-symbols (repeat (js/Object.create nil))))) |
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@viebel I think this one makes sense on its own as a change; I'm not entirely sure of the security implications though it does unhinge the forbidden symbols from the Object and Function prototypes…
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Status: DO NOT MERGE
See #247
See #339
When we assign our new
(secured-eval)we've been allowing thewindowproperty to bleed through as
this. Additionally we have been settingour forbidden symbols as the empty object
{}which also exposes theObjectprototype.In this patch we're replacing both of those in an attempt to further
limit the extent to which scripts can access global data.
The downside to this approach is that we've lost all prototypes that we
want, such as
Array.prototype.map. The severity of this limitation isso high that it's probably unmergable, but I'm hoping there might still
be a way to resolve that.