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chore: tighten up REPL security #300

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Merged
merged 2 commits into from
Oct 9, 2024
Merged

chore: tighten up REPL security #300

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4b85b14
chore: tighten up REPL security
dummdidumm Oct 9, 2024
a91df5c
Update packages/repl/src/lib/Output/Viewer.svelte
dummdidumm Oct 9, 2024
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6 changes: 6 additions & 0 deletions apps/svelte.dev/src/routes/(authed)/playground/[id]/+page.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
import { mapbox_setup } from '../../../../config.js';
import AppControls from './AppControls.svelte';
import { compress_and_encode_text, decode_and_decompress_text } from './gzip.js';
import { page } from '$app/stores';

let { data } = $props();

Expand All @@ -18,6 +19,10 @@
let version = data.version;
let setting_hash: any = null;

// Hashed URLs are less safe (we can't delete malicious REPLs), therefore
// don't allow links to escape the sandbox restrictions
const can_escape = browser && !$page.url.hash;

onMount(() => {
if (version !== 'local') {
fetch(`https://unpkg.com/svelte@${version}/package.json`)
Expand Down Expand Up @@ -127,6 +132,7 @@
bind:this={repl}
{svelteUrl}
{relaxed}
{can_escape}
vim={data.vim}
injectedJS={mapbox_setup}
showModified
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1 change: 1 addition & 0 deletions apps/svelte.dev/src/routes/(authed)/playground/[id]/embed/+page.svelte
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Expand Up @@ -50,6 +50,7 @@
bind:this={repl}
{svelteUrl}
{relaxed}
can_escape
injectedJS={mapbox_setup}
showModified
showAst
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1 change: 1 addition & 0 deletions apps/svelte.dev/src/routes/tutorial/[slug]/OutputRollup.svelte
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Expand Up @@ -34,6 +34,7 @@
{#if browser}
<Viewer
relaxed
can_escape
onLog={(l: Log[]) => logs = l}
{bundle}
theme={$theme.current}
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2 changes: 2 additions & 0 deletions packages/repl/src/lib/Output/Output.svelte
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Expand Up @@ -13,6 +13,7 @@
export let runtimeError: Error | null = null;
export let embedded = false;
export let relaxed = false;
export let can_escape = false;
export let injectedJS: string;
export let injectedCSS: string;
export let showAst = false;
Expand Down Expand Up @@ -61,6 +62,7 @@
bind:error={runtimeError}
{status}
{relaxed}
{can_escape}
{injectedJS}
{injectedCSS}
theme={previewTheme}
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28 changes: 5 additions & 23 deletions packages/repl/src/lib/Output/Viewer.svelte
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Expand Up @@ -18,6 +18,8 @@
export let status: string | null;
/** sandbox allow-same-origin */
export let relaxed = false;
/** sandbox allow-popups-to-escape-sandbox (i.e. links within the REPL to other pages work) */
export let can_escape = false;
/** Any additional JS you may want to inject */
export let injectedJS = '';
/** Any additional CSS you may want to inject */
Expand Down Expand Up @@ -247,13 +249,13 @@
class:inited
bind:this={iframe}
sandbox={[
'allow-popups-to-escape-sandbox',
'allow-scripts',
'allow-popups',
'allow-forms',
'allow-pointer-lock',
'allow-top-navigation',
'allow-top-navigation-by-user-activation',
'allow-modals',
can_escape ? 'allow-popups-to-escape-sandbox' : '',
relaxed ? 'allow-same-origin' : ''
Comment on lines 256 to 258
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same question

Suggested change
'allow-modals',
can_escape ? 'allow-popups-to-escape-sandbox' : '',
relaxed ? 'allow-same-origin' : ''
'allow-modals'

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@dummdidumm dummdidumm Oct 9, 2024 •
edited
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Without allow-popups-to-escape-sandbox, when you click on an outgoing link, you'll get a "browser has blocked the response" on the page that opens. It's an edge case for sure, but maybe there's playgrounds which showcase a certain aspect of their library and have a link with "you can read more about this here". Because it's potentially malicious it's only allowed on saved-to-db-REPLs which we could delete if the need arises.

Without allow-same-origin you can't access the parents localstorage,cookies, etc. With the headers being set due to the web container stuff, you also can't access the static images served from the parent domain (e.g. the Rick Roll wouldn't work anymore in the tutorial) - though that part could also be solved through #301. Currently this is only set for things that aren't user-content, i.e. the tutorial, because else this would be dangerous. I'm not sure why this was originally added (preceedes my time at Svelte)

].join(' ')}
class={error || pending || pending_imports ? 'greyed-out' : ''}
Expand All @@ -269,27 +271,7 @@
{#if !onLog}
<PaneWithPanel pos="90%" panel="Console">
<div slot="main">
<iframe
title="Result"
class:inited
bind:this={iframe}
sandbox={[
'allow-popups-to-escape-sandbox',
'allow-scripts',
'allow-popups',
'allow-forms',
'allow-pointer-lock',
'allow-top-navigation',
'allow-modals',
relaxed ? 'allow-same-origin' : ''
].join(' ')}
class={error || pending || pending_imports ? 'greyed-out' : ''}
srcdoc={BROWSER ? srcdoc : ''}
></iframe>

{#if $bundle?.error}
<ErrorOverlay error={$bundle.error} />
{/if}
{@render main()}
</div>

<div slot="panel-header">
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2 changes: 2 additions & 0 deletions packages/repl/src/lib/Repl.svelte
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Expand Up @@ -20,6 +20,7 @@
export let embedded = false;
export let orientation: 'columns' | 'rows' = 'columns';
export let relaxed = false;
export let can_escape = false;
export let fixed = false;
export let fixedPos = 50;
export let injectedJS = '';
Expand Down Expand Up @@ -312,6 +313,7 @@
status={status_visible ? status : null}
{embedded}
{relaxed}
{can_escape}
{injectedJS}
{injectedCSS}
{showAst}
Expand Down
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