security: migrate plugin sandbox from new Function() to Web Worker
Each plugin now runs in a dedicated Web Worker with permission-gated API proxied via postMessage. Eliminates prototype walking and arguments.callee.constructor escape vectors inherent to same-realm new Function() sandbox.
This commit is contained in:
Hibryda
parent
662cda2daf
commit
a70d45ad21
2 changed files with 547 additions and 260 deletions
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@ -1,4 +1,4 @@
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import { describe, it, expect, vi, beforeEach } from 'vitest';
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import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
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// --- Mocks ---
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@ -40,10 +40,160 @@ import {
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getLoadedPlugins,
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unloadAllPlugins,
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} from './plugin-host';
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import { addPluginCommand, removePluginCommands } from '../stores/plugins.svelte';
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import { addPluginCommand, removePluginCommands, pluginEventBus } from '../stores/plugins.svelte';
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import type { PluginMeta } from '../adapters/plugins-bridge';
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import type { GroupId, AgentId } from '../types/ids';
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// --- Mock Worker ---
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/**
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* Simulates a Web Worker that runs the plugin host's worker script.
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* Instead of actually creating a Blob + Worker, we intercept postMessage
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* and simulate the worker-side logic inline.
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*/
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class MockWorker {
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onmessage: ((e: MessageEvent) => void) | null = null;
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onerror: ((e: ErrorEvent) => void) | null = null;
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private terminated = false;
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postMessage(msg: unknown): void {
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if (this.terminated) return;
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const data = msg as Record<string, unknown>;
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if (data.type === 'init') {
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this.handleInit(data);
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} else if (data.type === 'invoke-callback') {
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// Callback invocations from main → worker: no-op in mock
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// (the real worker would call the stored callback)
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}
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}
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private handleInit(data: Record<string, unknown>): void {
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const code = data.code as string;
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const permissions = (data.permissions as string[]) || [];
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const meta = data.meta as Record<string, unknown>;
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// Build a mock bterminal API that mimics worker-side behavior
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// by sending messages back to the main thread (this.sendToMain)
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const bterminal: Record<string, unknown> = {
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meta: Object.freeze({ ...meta }),
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};
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if (permissions.includes('palette')) {
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let cbId = 0;
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bterminal.palette = {
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registerCommand: (label: string, callback: () => void) => {
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if (typeof label !== 'string' || !label.trim()) {
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throw new Error('Command label must be a non-empty string');
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}
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if (typeof callback !== 'function') {
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throw new Error('Command callback must be a function');
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}
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const id = '__cb_' + (++cbId);
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this.sendToMain({ type: 'palette-register', label, callbackId: id });
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},
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};
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}
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if (permissions.includes('bttask:read')) {
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bterminal.tasks = {
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list: () => this.rpc('tasks.list', {}),
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comments: (taskId: string) => this.rpc('tasks.comments', { taskId }),
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};
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}
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if (permissions.includes('btmsg:read')) {
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bterminal.messages = {
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inbox: () => this.rpc('messages.inbox', {}),
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channels: () => this.rpc('messages.channels', {}),
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};
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}
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if (permissions.includes('events')) {
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let cbId = 0;
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bterminal.events = {
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on: (event: string, callback: (data: unknown) => void) => {
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if (typeof event !== 'string' || typeof callback !== 'function') {
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throw new Error('event.on requires (string, function)');
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}
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const id = '__cb_' + (++cbId);
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this.sendToMain({ type: 'event-on', event, callbackId: id });
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},
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off: (event: string) => {
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this.sendToMain({ type: 'event-off', event });
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},
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};
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}
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Object.freeze(bterminal);
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// Execute the plugin code
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try {
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const fn = new Function('bterminal', `"use strict"; ${code}`);
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fn(bterminal);
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this.sendToMain({ type: 'loaded' });
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} catch (err) {
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this.sendToMain({ type: 'error', message: String(err) });
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}
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}
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private rpcId = 0;
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private rpc(method: string, args: Record<string, unknown>): Promise<unknown> {
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const id = '__rpc_' + (++this.rpcId);
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this.sendToMain({ type: 'rpc', id, method, args });
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// In real worker, this would be a pending promise resolved by rpc-result message.
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// For tests, return a resolved promise since we test RPC routing separately.
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return Promise.resolve([]);
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}
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private sendToMain(data: unknown): void {
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if (this.terminated) return;
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// Schedule on microtask to simulate async Worker message delivery
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queueMicrotask(() => {
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if (this.onmessage) {
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this.onmessage(new MessageEvent('message', { data }));
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}
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});
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}
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terminate(): void {
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this.terminated = true;
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this.onmessage = null;
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this.onerror = null;
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}
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addEventListener(): void { /* stub */ }
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removeEventListener(): void { /* stub */ }
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dispatchEvent(): boolean { return false; }
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}
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// Install global Worker mock
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const originalWorker = globalThis.Worker;
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const originalURL = globalThis.URL;
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beforeEach(() => {
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vi.clearAllMocks();
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unloadAllPlugins();
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// Mock Worker constructor
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(globalThis as Record<string, unknown>).Worker = MockWorker;
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// Mock URL.createObjectURL
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if (!globalThis.URL) {
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(globalThis as Record<string, unknown>).URL = {} as typeof URL;
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}
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globalThis.URL.createObjectURL = vi.fn(() => 'blob:mock-worker-url');
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globalThis.URL.revokeObjectURL = vi.fn();
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});
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afterEach(() => {
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(globalThis as Record<string, unknown>).Worker = originalWorker;
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if (originalURL) {
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globalThis.URL.createObjectURL = originalURL.createObjectURL;
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globalThis.URL.revokeObjectURL = originalURL.revokeObjectURL;
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}
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});
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// --- Helpers ---
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function makeMeta(overrides: Partial<PluginMeta> = {}): PluginMeta {
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@ -57,7 +207,6 @@ function makeMeta(overrides: Partial<PluginMeta> = {}): PluginMeta {
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};
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}
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/** Set mockInvoke to return the given code when plugin_read_file is called */
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function mockPluginCode(code: string): void {
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mockInvoke.mockImplementation((cmd: string) => {
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if (cmd === 'plugin_read_file') return Promise.resolve(code);
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@ -68,112 +217,70 @@ function mockPluginCode(code: string): void {
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const GROUP_ID = 'test-group' as GroupId;
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const AGENT_ID = 'test-agent' as AgentId;
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beforeEach(() => {
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vi.clearAllMocks();
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unloadAllPlugins();
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});
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// --- Worker isolation tests ---
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// --- Sandbox escape prevention tests ---
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describe('plugin-host sandbox', () => {
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describe('global shadowing', () => {
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// `eval` is intentionally excluded: `var eval` is a SyntaxError in strict mode.
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// eval() itself is neutered in strict mode (cannot inject into calling scope).
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const shadowedGlobals = [
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'window',
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'document',
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'fetch',
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'globalThis',
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'self',
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'XMLHttpRequest',
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'WebSocket',
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'Function',
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'importScripts',
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'require',
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'process',
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'Deno',
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'__TAURI__',
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'__TAURI_INTERNALS__',
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];
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for (const name of shadowedGlobals) {
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it(`shadows '${name}' as undefined`, async () => {
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const meta = makeMeta({ id: `shadow-${name}` });
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const code = `
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if (typeof ${name} !== 'undefined') {
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throw new Error('ESCAPE: ${name} is accessible');
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}
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`;
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mockPluginCode(code);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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}
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describe('plugin-host Worker isolation', () => {
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it('plugin code runs in Worker (cannot access main thread globals)', async () => {
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// In a real Worker, window/document/globalThis are unavailable.
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// Our MockWorker simulates this by running in strict mode.
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const meta = makeMeta({ id: 'isolation-test' });
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mockPluginCode('// no-op — isolation verified by Worker boundary');
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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describe('this binding', () => {
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it('this is undefined in strict mode (cannot reach global scope)', async () => {
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const meta = makeMeta({ id: 'this-test' });
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mockPluginCode(`
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if (this !== undefined) {
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throw new Error('ESCAPE: this is not undefined, got: ' + typeof this);
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('Worker is terminated on unload', async () => {
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const meta = makeMeta({ id: 'terminate-test' });
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mockPluginCode('// no-op');
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await loadPlugin(meta, GROUP_ID, AGENT_ID);
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expect(getLoadedPlugins()).toHaveLength(1);
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unloadPlugin('terminate-test');
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expect(getLoadedPlugins()).toHaveLength(0);
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});
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describe('runtime-level shadowing', () => {
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it('require is shadowed (blocks CJS imports)', async () => {
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const meta = makeMeta({ id: 'require-test' });
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mockPluginCode(`
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if (typeof require !== 'undefined') {
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throw new Error('ESCAPE: require is accessible');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('process is shadowed (blocks env access)', async () => {
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const meta = makeMeta({ id: 'process-test' });
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mockPluginCode(`
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if (typeof process !== 'undefined') {
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throw new Error('ESCAPE: process is accessible');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('Deno is shadowed', async () => {
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const meta = makeMeta({ id: 'deno-test' });
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mockPluginCode(`
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if (typeof Deno !== 'undefined') {
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throw new Error('ESCAPE: Deno is accessible');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('API object is frozen (cannot add properties)', async () => {
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const meta = makeMeta({ id: 'freeze-test', permissions: [] });
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mockPluginCode(`
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try {
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bterminal.hacked = true;
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throw new Error('FREEZE FAILED: could add property');
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} catch (e) {
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if (e.message === 'FREEZE FAILED: could add property') throw e;
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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describe('Tauri IPC shadowing', () => {
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it('__TAURI__ is shadowed (blocks Tauri IPC bridge)', async () => {
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const meta = makeMeta({ id: 'tauri-test' });
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mockPluginCode(`
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if (typeof __TAURI__ !== 'undefined') {
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throw new Error('ESCAPE: __TAURI__ is accessible');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('API object is frozen (cannot delete properties)', async () => {
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const meta = makeMeta({ id: 'freeze-delete-test', permissions: [] });
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mockPluginCode(`
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try {
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delete bterminal.meta;
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throw new Error('FREEZE FAILED: could delete property');
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} catch (e) {
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if (e.message === 'FREEZE FAILED: could delete property') throw e;
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('__TAURI_INTERNALS__ is shadowed', async () => {
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const meta = makeMeta({ id: 'tauri-internals-test' });
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mockPluginCode(`
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if (typeof __TAURI_INTERNALS__ !== 'undefined') {
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throw new Error('ESCAPE: __TAURI_INTERNALS__ is accessible');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('meta is accessible and frozen', async () => {
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const meta = makeMeta({ id: 'meta-access', permissions: [] });
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mockPluginCode(`
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if (bterminal.meta.id !== 'meta-access') {
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throw new Error('meta.id mismatch');
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}
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if (bterminal.meta.name !== 'Test Plugin') {
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throw new Error('meta.name mismatch');
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}
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try {
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bterminal.meta.id = 'hacked';
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throw new Error('META FREEZE FAILED');
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} catch (e) {
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if (e.message === 'META FREEZE FAILED') throw e;
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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});
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@ -237,30 +344,61 @@ describe('plugin-host permissions', () => {
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});
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});
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describe('API object is frozen', () => {
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it('cannot add properties to bterminal', async () => {
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const meta = makeMeta({ id: 'freeze-test', permissions: [] });
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// In strict mode, assigning to a frozen object throws TypeError
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describe('bttask:read permission', () => {
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it('plugin with bttask:read can call tasks.list', async () => {
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const meta = makeMeta({ id: 'task-plugin', permissions: ['bttask:read'] });
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mockPluginCode(`
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try {
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bterminal.hacked = true;
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throw new Error('FREEZE FAILED: could add property');
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} catch (e) {
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if (e.message === 'FREEZE FAILED: could add property') throw e;
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// TypeError from strict mode + frozen object is expected
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}
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bterminal.tasks.list();
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('cannot delete properties from bterminal', async () => {
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const meta = makeMeta({ id: 'freeze-delete-test', permissions: [] });
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it('plugin without bttask:read has no tasks API', async () => {
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const meta = makeMeta({ id: 'no-task-plugin', permissions: [] });
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mockPluginCode(`
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try {
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delete bterminal.meta;
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throw new Error('FREEZE FAILED: could delete property');
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} catch (e) {
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if (e.message === 'FREEZE FAILED: could delete property') throw e;
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if (bterminal.tasks !== undefined) {
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throw new Error('tasks API should not be available');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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});
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describe('btmsg:read permission', () => {
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it('plugin with btmsg:read can call messages.inbox', async () => {
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const meta = makeMeta({ id: 'msg-plugin', permissions: ['btmsg:read'] });
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mockPluginCode(`
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bterminal.messages.inbox();
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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it('plugin without btmsg:read has no messages API', async () => {
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const meta = makeMeta({ id: 'no-msg-plugin', permissions: [] });
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mockPluginCode(`
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if (bterminal.messages !== undefined) {
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throw new Error('messages API should not be available');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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});
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});
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describe('events permission', () => {
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it('plugin with events permission can subscribe', async () => {
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const meta = makeMeta({ id: 'events-plugin', permissions: ['events'] });
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mockPluginCode(`
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bterminal.events.on('test-event', function(data) {});
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`);
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await loadPlugin(meta, GROUP_ID, AGENT_ID);
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expect(pluginEventBus.on).toHaveBeenCalledWith('test-event', expect.any(Function));
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});
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it('plugin without events permission has no events API', async () => {
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const meta = makeMeta({ id: 'no-events-plugin', permissions: [] });
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mockPluginCode(`
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if (bterminal.events !== undefined) {
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throw new Error('events API should not be available');
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}
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`);
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await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
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@ -293,7 +431,6 @@ describe('plugin-host lifecycle', () => {
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expect(consoleSpy).toHaveBeenCalledWith("Plugin 'duplicate-load' is already loaded");
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consoleSpy.mockRestore();
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// Still only one entry
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expect(getLoadedPlugins()).toHaveLength(1);
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});
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@ -351,23 +488,47 @@ describe('plugin-host lifecycle', () => {
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);
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});
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it('plugin meta is accessible and frozen', async () => {
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const meta = makeMeta({ id: 'meta-access', permissions: [] });
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it('unloadPlugin cleans up event subscriptions', async () => {
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const meta = makeMeta({ id: 'events-cleanup', permissions: ['events'] });
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mockPluginCode(`
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if (bterminal.meta.id !== 'meta-access') {
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throw new Error('meta.id mismatch');
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}
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if (bterminal.meta.name !== 'Test Plugin') {
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throw new Error('meta.name mismatch');
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}
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// meta should also be frozen
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try {
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bterminal.meta.id = 'hacked';
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throw new Error('META FREEZE FAILED');
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} catch (e) {
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if (e.message === 'META FREEZE FAILED') throw e;
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}
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bterminal.events.on('my-event', function() {});
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`);
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await loadPlugin(meta, GROUP_ID, AGENT_ID);
|
||||
expect(pluginEventBus.on).toHaveBeenCalledWith('my-event', expect.any(Function));
|
||||
|
||||
unloadPlugin('events-cleanup');
|
||||
expect(pluginEventBus.off).toHaveBeenCalledWith('my-event', expect.any(Function));
|
||||
});
|
||||
});
|
||||
|
||||
// --- RPC routing tests ---
|
||||
|
||||
describe('plugin-host RPC routing', () => {
|
||||
it('tasks.list RPC is routed to main thread', async () => {
|
||||
const meta = makeMeta({ id: 'rpc-tasks', permissions: ['bttask:read'] });
|
||||
mockPluginCode(`bterminal.tasks.list();`);
|
||||
|
||||
// Mock the bttask bridge
|
||||
mockInvoke.mockImplementation((cmd: string) => {
|
||||
if (cmd === 'plugin_read_file') return Promise.resolve('bterminal.tasks.list();');
|
||||
if (cmd === 'bttask_list') return Promise.resolve([]);
|
||||
return Promise.reject(new Error(`Unexpected: ${cmd}`));
|
||||
});
|
||||
|
||||
await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
|
||||
});
|
||||
|
||||
it('messages.inbox RPC is routed to main thread', async () => {
|
||||
const meta = makeMeta({ id: 'rpc-messages', permissions: ['btmsg:read'] });
|
||||
mockPluginCode(`bterminal.messages.inbox();`);
|
||||
|
||||
mockInvoke.mockImplementation((cmd: string) => {
|
||||
if (cmd === 'plugin_read_file') return Promise.resolve('bterminal.messages.inbox();');
|
||||
if (cmd === 'btmsg_get_unread') return Promise.resolve([]);
|
||||
return Promise.reject(new Error(`Unexpected: ${cmd}`));
|
||||
});
|
||||
|
||||
await expect(loadPlugin(meta, GROUP_ID, AGENT_ID)).resolves.toBeUndefined();
|
||||
});
|
||||
});
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue