Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 | 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 18x 18x 18x 18x 5x 18x 18x 18x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 110x 110x 110x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 152x 152x 35x 35x 150x 152x 256x 256x 256x 256x 256x 256x 78x 78x 32x 32x 46x 78x 256x 256x 256x 256x 256x 256x 256x 120x 120x 10x 10x 110x 120x 20x 20x 90x 117x 8x 8x 82x 82x 82x 82x 82x 82x 82x 82x 82x 82x 94x 54x 54x 40x 94x 94x 40x 40x 40x 40x 40x 40x 94x 40x 40x 40x 40x 40x 40x 40x 94x 40x 78x 32x 32x 40x 40x 82x 82x 82x 82x 82x 82x 82x 82x 82x 82x 82x 8x 8x 82x 82x 82x 117x 47x 47x 47x 47x 47x 47x 47x 47x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 47x 2x 2x 2x 2x 47x 47x 82x 82x 82x 82x 120x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 256x 30x 30x 30x 256x 256x 256x 256x 256x 256x 256x 256x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 60x 60x 60x 36x 36x 36x 36x 36x 36x 36x 36x 36x 128x 60x 60x 68x 128x 10x 10x 58x 128x 1x 1x 1x 1x 1x 128x 57x 128x 41x 41x 16x 128x 16x 16x 16x 16x 16x 16x 16x 16x 29x 3x 3x 13x 13x 13x 13x 13x 13x 13x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 7x 2x 2x 2x 2x 2x 5x 7x 5x 7x 5x 5x 5x 7x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 256x | import { AvenxError, AvenxErrorCodes } from '../runtime/AvenxError.js';
import { resolveSandboxGlobal } from '../trace/globals.js';
/**
* @file sandbox.js
* @description Secure Template Expression Sandbox module for the Avenx-JS framework.
* Located at `lib/core/security/sandbox.js`.
* To prevent critical security vulnerabilities such as prototype pollution and Cross-Site Scripting (XSS),
* all template expressions and computed properties execute within an isolated execution sandbox wrapper.
* The sandbox dynamically guards evaluation context by blocking access to structural object properties
* (`__proto__`, `constructor`, `prototype`) and restricts active identifier scopes strictly to the
* `ALLOWED_GLOBALS` whitelist map.
* If an expression attempts to invoke an unauthorized standard window API environment variable
* (e.g., calling `alert()` or checking `localStorage` directly in an HTML attribute binding),
* the application state will gracefully halt and trigger an execution failure throw code: **`AVX_R15`**.
* @example
* // ❌ ANTI-PATTERN (Will trigger an AVX_R15 Sandbox Violation at runtime)
* // <button onclick="alert('Operation successful!')">Submit</button>
* // <div v-if="localStorage.getItem('user_token')">Profile Content</div>
* @example
* // ✅ PROPER ARCHITECTURAL PATTERN
* // Decouple browser environment window APIs into standard component method actions:
* export default {
* name: 'SecureActionComponent',
* methods: {
* handleSubmit() {
* // Native browser ecosystem APIs are fully available here
* alert('Operation successful!');
* localStorage.setItem('user_token', 'validated_hash');
* }
* }
* };
*/
/**
* Whitelist allocation set tracking global identifiers authorized for inline evaluation scope.
* Global scopes outside this tracking collection are rejected with a sandbox exception.
* @type {Set<string>}
* @property {string} Math - Native mathematical calculations and constants.
* @property {string} JSON - Structured string serialization and parsing tools.
* @property {string} Array - Array generation constructors.
* @property {string} Object - Standard JavaScript object manipulators.
* @property {string} String - Text parsing constructors.
* @property {string} console - Core debugging console methods.
* @property {string} parseInt - Numeric text converter algorithms.
* @property {string} parseFloat - Decimal text converter algorithms.
*/
const ALLOWED_GLOBALS = new Set([
'Math',
'JSON',
'Array',
'Object',
'String',
'Number',
'Boolean',
'Date',
'Error',
'Map',
'Set',
'Promise',
'console',
'parseInt',
'parseFloat',
'isNaN',
'isFinite',
'decodeURI',
'decodeURIComponent',
'encodeURI',
'encodeURIComponent',
'undefined',
'NaN',
'Infinity',
]);
const RESTRICTED_GLOBALS = new Set([
'window',
'document',
'localStorage',
'sessionStorage',
'location',
'navigator',
'history',
'fetch',
'alert',
'confirm',
'prompt',
'setTimeout',
'setInterval',
'clearTimeout',
'clearInterval',
'XMLHttpRequest',
'WebSocket',
'global',
'globalThis',
'process',
'eval',
'Function',
]);
/**
* Determines whether a property key refers to a restricted global object.
* @param {string|symbol} key - Property key to check.
* @returns {boolean}
*/
function isRestrictedGlobal(key) {
if (typeof key !== 'string') return false;
if (ALLOWED_GLOBALS.has(key)) return false;
if (RESTRICTED_GLOBALS.has(key)) return true;
try {
return typeof globalThis !== 'undefined' && key in globalThis;
} catch {
return false;
}
}
const RAW_TARGET = Symbol.for('rawTarget');
const proxyCache = new WeakMap();
// NOTE: this module deliberately does not patch `Function.prototype.constructor`.
// Doing so at import time altered a shared intrinsic for the whole realm, so
// every unrelated library on the page saw `fn.constructor` throw — a common
// idiom in type guards, polyfills and serializers. Access to the Function
// constructor from inside a template is blocked where it belongs instead: on
// the sandbox proxies themselves (see FUNCTION_CONSTRUCTORS below).
/**
* The dynamic-code constructors. Reaching any of these from a template would
* allow arbitrary code execution, so the sandbox refuses to hand them out or
* invoke them regardless of the route taken to obtain them (property access,
* property descriptors, prototype walks).
* @type {Set<Function>}
*/
const FUNCTION_CONSTRUCTORS = new Set(
[
Function,
Object.getPrototypeOf(function* () {}).constructor,
Object.getPrototypeOf(async () => {}).constructor,
Object.getPrototypeOf(async function* () {}).constructor,
].filter((ctor) => typeof ctor === 'function'),
);
/**
* Throws when a value is one of the dynamic-code constructors.
* @param {any} value - The value about to be returned or invoked.
*/
function assertNotFunctionConstructor(value) {
if (typeof value === 'function' && FUNCTION_CONSTRUCTORS.has(value)) {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to the Function constructor is blocked for security reasons.',
);
}
}
/**
* Built-in prototypes shared by every object in the realm.
*
* `validateSource` only rejects the literal identifiers `constructor`,
* `__proto__` and `prototype`, which a computed access such as
* `Object.getPrototypeOf({})` or `Object['proto' + 'type']` walks straight
* past. Handing one of these objects to a template would let it mutate state
* shared with the host application, so the sandbox refuses to surface them at
* all rather than trying to enumerate every mutating API.
* @type {Set<object>}
*/
const PROTECTED_PROTOTYPES = new Set(
[
Object.prototype,
Array.prototype,
Function.prototype,
String.prototype,
Number.prototype,
Boolean.prototype,
Date.prototype,
RegExp.prototype,
Error.prototype,
Map.prototype,
Set.prototype,
WeakMap.prototype,
WeakSet.prototype,
Promise.prototype,
].filter((proto) => proto !== null && proto !== undefined),
);
/**
* Throws when a value is a shared built-in prototype.
* @param {any} value - The value about to be returned, passed or invoked.
*/
function assertNotProtectedPrototype(value) {
if (value === null || (typeof value !== 'object' && typeof value !== 'function')) {
return;
}
if (PROTECTED_PROTOTYPES.has(value)) {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to built-in prototypes is blocked for security reasons.',
);
}
}
/**
* Unwraps a value if it's a sandbox Proxy, returning its raw target object.
* @param {any} val - The value to unwrap.
* @returns {any}
*/
function unwrap(val) {
if (val && typeof val === 'object' && val[RAW_TARGET]) {
return val[RAW_TARGET];
}
return val;
}
/**
* Wraps an object or function recursively in a Proxy that blocks prototype pollution
* and un-proxies arguments/context when called.
* @param {any} val - The value to wrap.
* @returns {any}
*/
function wrapValue(val) {
if (val === null || val === undefined) {
return val;
}
if (typeof val !== 'object' && typeof val !== 'function') {
return val;
}
if (proxyCache.has(val)) {
return proxyCache.get(val);
}
const traps = {
/**
* Intercepts property retrieval.
* @param {object} target - The target object.
* @param {string|symbol} key - The property name.
* @param {object} receiver - The Proxy or inherits from it.
* @returns {any}
*/
get(target, key, receiver) {
if (key === RAW_TARGET) {
return target;
}
if (key === '__proto__') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to property "__proto__" is blocked for security reasons.',
);
}
if (key === 'constructor' && typeof target === 'function') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to property "constructor" on functions is blocked for security reasons.',
);
}
let res;
try {
// The proxy is the receiver so reactive state keeps tracking property
// reads through it.
res = Reflect.get(target, key, receiver);
} catch (err) {
// Accessors backed by an internal slot (Set.prototype.size,
// Map.prototype.size) reject a receiver that does not carry the slot.
if (err instanceof TypeError) {
res = Reflect.get(target, key, target);
} else {
throw err;
}
}
// Never hand out a dynamic-code constructor or a shared built-in
// prototype, however they were reached.
assertNotFunctionConstructor(res);
assertNotProtectedPrototype(res);
const desc = Reflect.getOwnPropertyDescriptor(target, key);
if (desc && !desc.configurable && !desc.writable) {
return res;
}
if (typeof res === 'function') {
res = res.bind(target);
}
return wrapValue(res);
},
/**
* Intercepts property assignment.
* @param {object} target - The target object.
* @param {string|symbol} key - The property name.
* @param {any} value - The new value.
* @param {object} receiver - The object originally targeted.
* @returns {boolean}
*/
set(target, key, value, receiver) {
if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
`Writing to property "${String(key)}" is blocked for security reasons.`,
);
}
return Reflect.set(target, key, value, receiver);
},
};
if (typeof val === 'function') {
/**
* Intercepts function execution.
* @param {object} target - The target function.
* @param {any} thisArg - The context.
* @param {any[]} argumentsList - The arguments passed.
* @returns {any}
*/
traps.apply = function (target, thisArg, argumentsList) {
assertNotFunctionConstructor(target);
const rawThis = unwrap(thisArg);
const rawArgs = argumentsList.map(unwrap);
// A reflection call such as Object.assign or Object.defineProperty must
// not be handed a shared prototype as its target.
assertNotProtectedPrototype(rawThis);
rawArgs.forEach(assertNotProtectedPrototype);
const result = Reflect.apply(target, rawThis, rawArgs);
assertNotFunctionConstructor(result);
assertNotProtectedPrototype(result);
return wrapValue(result);
};
/**
* Intercepts `new` on a wrapped function.
*
* The raw target is used as newTarget. Passing the proxy would make
* Reflect.construct read `newTarget.prototype` back through the `get`
* trap, where the built-in prototype guard would reject the constructor's
* own prototype and break ordinary `new Date(...)` / `new Map(...)` calls.
* @param {object} target - The target function.
* @param {any[]} argumentsList - The arguments passed.
* @returns {any}
*/
traps.construct = function (target, argumentsList) {
assertNotFunctionConstructor(target);
const rawArgs = argumentsList.map(unwrap);
rawArgs.forEach(assertNotProtectedPrototype);
return wrapValue(Reflect.construct(target, rawArgs, target));
};
}
const wrapped = new Proxy(val, traps);
proxyCache.set(val, wrapped);
return wrapped;
}
/**
* Handles creation of secure sandbox contexts.
*/
export class AvenxSandbox {
/**
* Statically validates an expression or statement string to ensure it does not contain
* forbidden property names.
* @param {string} source - The source code to check.
*/
static validateSource(source) {
const FORBIDDEN_WORDS = /\b(constructor|__proto__|prototype)\b/;
if (typeof source === 'string' && FORBIDDEN_WORDS.test(source)) {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to "constructor", "__proto__", or "prototype" is blocked for security reasons.',
);
}
}
/**
* Creates a sandboxed Proxy context representing the combined scope and thisArg.
* @param {object} scope - The scope variables.
* @param {object} thisArg - The active 'this' context.
* @param {boolean} [excludeParams] - If true, excludes special event params from the has trap.
* @returns {Proxy} The sandboxed Proxy object.
*/
static createProxy(scope, thisArg, excludeParams = false) {
const target = {};
const activeThis = thisArg || scope || {};
return new Proxy(target, {
/**
* Intercepts `has` check, claiming to have all properties to capture lookups in `with`.
* @param {object} t - The target object.
* @param {string|symbol} key - The property checked.
* @returns {boolean}
*/
has(t, key) {
if (key === Symbol.unscopables) {
return false;
}
if (excludeParams && (key === 'state' || key === 'methods' || key === 'event' || key === 'args')) {
return false;
}
return true;
},
/**
* Intercepts property retrieval.
* @param {object} t - The target object.
* @param {string|symbol} key - The property name.
* @returns {any}
*/
get(t, key) {
if (key === Symbol.unscopables) {
return undefined;
}
if (key === RAW_TARGET) {
return activeThis;
}
if (key === '__proto__') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to property "__proto__" is blocked for security reasons.',
);
}
if (key === 'constructor' && typeof activeThis === 'function') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
'Access to property "constructor" on functions is blocked for security reasons.',
);
}
if (scope && key in scope) {
return wrapValue(scope[key]);
}
if (thisArg && key in thisArg) {
return wrapValue(thisArg[key]);
}
// Resolved through the tracer rather than read off globalThis so a
// recording session can log the non-deterministic values template code
// observes, and a replaying session can hand the same ones back. With
// no recording in progress this is a Map.size check and the same
// property read as before. Substituting here rather than patching the
// page's real globals keeps the swap invisible to unrelated scripts
// and impossible to outlive the recording.
if (ALLOWED_GLOBALS.has(key)) {
return wrapValue(resolveSandboxGlobal(key));
}
if (isRestrictedGlobal(key)) {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
`[Avenx Sandbox Violation] Access to global object "${String(key)}" is restricted inside templates. Decouple browser APIs into component methods.`,
);
}
return undefined;
},
/**
* Intercepts property assignment.
* @param {object} t - The target object.
* @param {string|symbol} key - The property name.
* @param {any} value - The new value.
* @returns {boolean}
*/
set(t, key, value) {
if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
`Writing to property "${String(key)}" is blocked for security reasons.`,
);
}
if (isRestrictedGlobal(key) && (!scope || !(key in scope)) && (!thisArg || !(key in thisArg))) {
throw new AvenxError(
AvenxErrorCodes.SANDBOX_VIOLATION,
`[Avenx Sandbox Violation] Access to global object "${String(key)}" is restricted inside templates. Decouple browser APIs into component methods.`,
);
}
if (thisArg && key in thisArg) {
thisArg[key] = value;
return true;
}
if (scope && key in scope) {
scope[key] = value;
return true;
}
if (scope) {
scope[key] = value;
return true;
}
return false;
},
/**
* Intercepts `getPrototypeOf` check.
* @returns {object}
*/
getPrototypeOf() {
return Reflect.getPrototypeOf(activeThis);
},
/**
* Intercepts `getOwnPropertyDescriptor` check.
* @param {object} t - The target.
* @param {string|symbol} key - The property.
* @returns {object}
*/
getOwnPropertyDescriptor(t, key) {
const desc = Reflect.getOwnPropertyDescriptor(activeThis, key);
if (desc) return desc;
return { configurable: true, enumerable: true, writable: true };
},
});
}
}
|