xss-filters alternatives and similar libraries
Based on the "Security" category.
Alternatively, view xss-filters alternatives based on common mentions on social networks and blogs.
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DOMPurify
DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo: -
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Retire.js
scanner detecting the use of JavaScript libraries with known vulnerabilities. Can also generate an SBOM of the libraries it finds. -
sanitize-html
Clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis. Built on htmlparser2 for speed and tolerance -
Themis by Cossack Labs
Easy to use cryptographic framework for data protection: secure messaging with forward secrecy and secure data storage. Has unified APIs across 14 platforms. -
data-guardian 🔒
Tiny, zero-dependencies, package which tries to mask sensitive data in arbitrary collections (map, set), errors, objects and strings. -
cidaas SDK for JS
With this SDK, you can integrate cidaas smoothly and with minimal effort into your javascript application. It enables you to map the most important user flows for OAuth2 and OIDC compliant authentication. Secure – Fast – And unrivaled Swabian.
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README
Secure XSS Filters
Just sufficient output filtering to prevent XSS!
Goals
- More Secure. Context-dependent output filters that are developer-friendly. It is safe to apply these filters like so:
document.write("<a href=" + xssFilters.uriInUnQuotedAttr(url) + ">" + xssFilters.uriInHTMLData(url) + "</a>");
In this example, the traditional wisdom of blindly escaping some special html entity characters (& < > ' " `) would not stop XSS (e.g., when url is equal to javascript:alert(1) or onclick=alert(1)).
- Faster with Just Sufficient Encoding. Encode the minimal set of characters to thwart JavaScript executions, thus preventing XSS attacks while keeping most characters intact. Compared to the traditional blindly escape filter, our filters are up to two times faster, and there is no more double-encoding problems such as '&lt;'!!
Figure 1. "Just sufficient" encoding based on the HTML5 spec.
Design
- Automation. Nothing can be better than applying context-sensitive output escaping automatically. Integration with Handlebars template engine is now available. Check out express-secure-handlebars for server-side use, or secure-handlebars for client-side use.
- Standards Compliant. The XSS filters are designed primarily based on the modern HTML 5 Specification. The principle is to escape characters specific to each non-scriptable output context. Hence, untrusted inputs, once sanitized by context-sensitive escaping, cannot break out from the containing context. This approach stops malicious inputs from being executed as scripts, and also prevents the age-old problem of over/double-encoding.
- Carefully Designed. Every filter is heavily scrutinized by Yahoo Security Engineers. The specific sets of characters that require encoding are minimized to preserve usability to the greatest extent possible.
Quick Start
Server-side (nodejs)
Install the xss-filters npm, and include it as a dependency for your project.
npm install xss-filters --save
Require xss-filters, and you may use it with your favorite template engine. Or just use it directly:
var express = require('express');
var app = express();
var xssFilters = require('xss-filters');
app.get('/', function(req, res){
var firstname = req.query.firstname; //an untrusted input collected from user
res.send('<h1> Hello, ' + xssFilters.inHTMLData(firstname) + '!</h1>');
});
app.listen(3000);
Client-side (browser)
Simply download the latest minified version from the [dist/](./dist) folder OR from the CDN. Embed it in your HTML file, and all filters are available in a global object called xssFilters.
<!doctype html><!-- You need HTML 5 mode for browser -->
...
<script src="dist/xss-filters.min.js"></script>
<script>
var firstname = "..."; //an untrusted input collected from user
document.write('<h1> Hello, ' + xssFilters.inHTMLData(firstname) + '!</h1>')
</script>
API Documentations
WARNINGS
(1) Filters MUST ONLY be applied to UTF-8-encoded documents.
(2) DON'T apply any filters inside any scriptable contexts, i.e., <script>, <style>, <object>, <embed>, and <svg> tags as well as style="" and onXXX="" (e.g., onclick) attributes. It is unsafe to permit untrusted input inside a scriptable context.
A workaround, if you need to include data for JS, is to use:
<input id="strJS" value="{{{inDoubleQuotedAttr data}}}">
and retrieve your data with document.getElementById('strJS').value.
The API
There are five context-sensitive filters for generic input:
<div>{{{inHTMLData data}}}</div><!--{{{inHTMLComment comment}}}--><input value='{{{inSingleQuotedAttr value}}}'/><input value="{{{inDoubleQuotedAttr value}}}"/><input value={{{inUnQuotedAttr value}}}/>
Here we use {{{ }}} to indicate output expression to ease illustrations
Whenever possible, apply the most specific filter that describes your context and data:
| Input\Context | HTMLData | HTMLComment | SingleQuotedAttr | DoubleQuotedAttr | UnQuotedAttr |
|---|---|---|---|---|---|
| Full URI | uriInHTMLData() | uriInHTMLComment() | uriInSingleQuotedAttr() | uriInDoubleQuotedAttr() | uriInUnQuotedAttr() |
| URI Path | uriPathInHTMLData() | uriPathInHTMLComment() | uriPathInSingleQuotedAttr() | uriPathInDoubleQuotedAttr() | uriPathInUnQuotedAttr() |
| URI Query | uriQueryInHTMLData() | uriQueryInHTMLComment() | uriQueryInSingleQuotedAttr() | uriQueryInDoubleQuotedAttr() | uriQueryInUnQuotedAttr() |
| URI Component | uriComponentInHTMLData() | uriComponentInHTMLComment() | uriComponentInSingleQuotedAttr() | uriComponentInDoubleQuotedAttr() | uriComponentInUnQuotedAttr() |
| URI Fragment | uriFragmentInHTMLData() | uriFragmentInHTMLComment() | uriFragmentInSingleQuotedAttr() | uriFragmentInDoubleQuotedAttr() | uriFragmentInUnQuotedAttr() |
Check out the [documentations](../../wiki) for more details.
Contributing
To contribute, make changes in [src/](./src) and [tests/](./tests), and then do:
npm test # run the tests
npm run-script build # build the minified version for client-side use
npm run-script docs # build the docs
License
This software is free to use under the Yahoo BSD license. See the [LICENSE file](./LICENSE) for license text and copyright information.
*Note that all licence references and agreements mentioned in the xss-filters README section above
are relevant to that project's source code only.