commenthol

safer-eval

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    "url": "https://github.com/commenthol/safer-eval/issues"

    "url": "https://github.com/commenthol/safer-eval.git"

  "author": "commenthol <commenthol@gmail.com>",

    "coverage": "nyc -r html -r text npm test",

    "lint": "eslint --fix src test *.js",

    "zuul": "zuul --no-coverage --local 3000 -- test/*.js"

[![NPM version](https://badge.fury.io/js/safer-eval.svg)](https://www.npmjs.com/package/safer-eval/)

A safer approach for eval in node and browser. Before using this module, **ask

yourself if there are no better options** than using saferEval.

It is potentially better than the bad old `eval()` but still has some harmful potential.

Especially when it comes to passing `context` props.

Use [clones][] to wrap-up the methods you like to allow.

This approach has proven to be HARMFUL and does not suit as repacement for eval in node and browser. 

Before using this module, **ask yourself if there are no better options** than using saferEval.

It is potentially better than the bad old `eval()` but has harmful potential.

Checkout the "harmful context" tests section.

![warning](https://raw.githubusercontent.com/commenthol/safer-eval/master/warning.png)

![harmful](https://raw.githubusercontent.com/commenthol/safer-eval/master/harmful.png)

**Warning:** The `saferEval` function may be harmful - so you are warned!

**Warning:** The `saferEval` function is harmful - so you are warned!

- For node check [vm2](https://www.npmjs.com/package/vm2).

If you like to **post exploits** you found on this module, feel free to do so. 

Maybe this helps then others to build a better sandbox.

In node the `vm` module is used to sandbox the evaluation of `code`.

The browser version `browser.js` might not be as safe as the node version

`index.js` as here no real sandboxing is available. Please consider modules like

[sandboxr](https://www.npmjs.com/package/sandboxr).

Always use `'use strict'` mode in functions/ files calling `saferEval()`.

Otherwise a sandbox breakout may be possible.

  'use strict' //< alternative within function

saferEval('(function () { while (true) {} })()')

infinitely. Consider using the module from within a worker thread which is terminated

Avoid passing `context` props while deserializing data from hostile environments.

`context` allows the definition of passed in Objects into the sandbox.

Take care, injected `code` can overwrite those passed context props!

**code**: `String`, a string containing javascript code

**context**: `Object`, define globals, properties for evaluation context

'use strict' //< NEVER FORGET TO ADD STRICT MODE in file/ function

const code = `{d: new Date('1970-01-01'), b: new Buffer('data')}`

// => toString.call(res.d) = '[object Date]'

// => toString.call(res.b) = '[object Buffer]'

const code = `{d: new Date('1970-01-01'), b: function () { return navigator.userAgent }`

const res = saferEval(code, {navigator: window.navigator})

// => toString.call(res.b) = '[object Function]'

		{
		"name": "safer-eval",
		"version": "1.3.5",
		"description": "a safer eval",
		"version": "1.3.6",
		"description": "harmful as eval",
		"keywords": [
		@@ -6,0 +6,0 @@ "eval",

Improved metrics

Worsened metrics

		@@ -1,18 +0,29 @@
		# safer-eval
		# safer-eval but harmful

		[![NPM version](https://badge.fury.io/js/safer-eval.svg)](https://www.npmjs.com/package/safer-eval/)

		> a safer eval
		> harmful as eval

		A safer approach for eval in node and browser. Before using this module, **ask
		yourself if there are no better options** than using saferEval.
		It is potentially better than the bad old `eval()` but still has some harmful potential.
		Especially when it comes to passing `context` props.
		Use [clones][] to wrap-up the methods you like to allow.
		This approach has proven to be HARMFUL and does not suit as repacement for eval in node and browser.
		Before using this module, ask yourself if there are no better options than using saferEval.
		It is potentially better than the bad old `eval()` but has harmful potential.
		Checkout the "harmful context" tests section.

		![warning](https://raw.githubusercontent.com/commenthol/safer-eval/master/warning.png)
		![harmful](https://raw.githubusercontent.com/commenthol/safer-eval/master/harmful.png)

		Warning: The `saferEval` function may be harmful - so you are warned!
		Warning: The `saferEval` function is harmful - so you are warned!

		Better packages:

		- For node check [vm2](https://www.npmjs.com/package/vm2).

		----

		If you like to post exploits you found on this module, feel free to do so.
		Please file an issue with your findings.

		Maybe this helps then others to build a better sandbox.

		----

		In node the `vm` module is used to sandbox the evaluation of `code`.
		@@ -19,0 +30,0 @@