https://github.com/google/csp-evaluator

https://github.com/google/csp-evaluator

Last synced: 1 day ago
JSON representation

• Host: GitHub
• URL: https://github.com/google/csp-evaluator
• Owner: google
• License: apache-2.0
• Created: 2016-10-14T14:41:41.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2024-10-29T12:24:45.000Z (13 days ago)
• Last Synced: 2024-10-29T14:51:57.605Z (13 days ago)
• Language: TypeScript
• Homepage: https://csp-evaluator.withgoogle.com
• Size: 255 KB
• Stars: 328
• Watchers: 15
• Forks: 46
• Open Issues: 17
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING
  • License: LICENSE
  • Authors: AUTHORS

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README

        
# CSP Evaluator Core Library

## Introduction

--------------------------------------------------------------------------------

Please note: this is not an official Google product.

CSP Evaluator allows developers and security experts to check if a Content

Security Policy ([CSP](https://csp.withgoogle.com/docs/index.html)) serves as a

strong mitigation against

[cross-site scripting attacks](https://www.google.com/about/appsecurity/learning/xss/).

It assists with the process of reviewing CSP policies, and helps identify subtle

CSP bypasses which undermine the value of a policy. CSP Evaluator checks are

based on a [large-scale study](https://research.google.com/pubs/pub45542.html)

and are aimed to help developers to harden their CSP and improve the security of

their applications. This tool is provided only for the convenience of developers

and Google provides no guarantees or warranties for this tool.

CSP Evaluator comes with a built-in list of common CSP allowlist bypasses which

reduce the security of a policy. This list only contains popular bypasses and is

by no means complete.

The CSP Evaluator library + frontend is deployed here:

https://csp-evaluator.withgoogle.com/

## Installing

This library is published to `https://www.npmjs.com/package/csp_evaluator`. You

can install it via:

```bash

npm install csp_evaluator

```

## Building

To build, run:

```bash

npm install && tsc --build

```

## Testing

To run unit tests, run:

```bash

npm install && npm test

```

## Example Usage

```javascript

import {CspEvaluator} from "csp_evaluator/dist/evaluator.js";

import {CspParser} from "csp_evaluator/dist/parser.js";

const parsed = new CspParser("script-src https://google.com").csp;

console.log(new CspEvaluator(parsed).evaluate());

```