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Difference between revisions of "OWASP Java HTML Sanitizer Project"

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= Creating a HTML Policy =
 
= Creating a HTML Policy =
  
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You can use prepackaged policies here: [https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/Sanitizers.java https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/Sanitizers.java].
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You can view a few basic prepackaged policies for links, tables, integers and images here: [https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/Sanitizers.java https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/Sanitizers.java].
  
 
  PolicyFactory policy = Sanitizers.FORMATTING.and(Sanitizers.LINKS);
 
  PolicyFactory policy = Sanitizers.FORMATTING.and(Sanitizers.LINKS);

Revision as of 23:03, 14 April 2016

OWASP Project Header.jpg

OWASP HTML Sanitizer Project

The OWASP HTML Sanitizer is a fast and easy to configure HTML Sanitizer written in Java which lets you include HTML authored by third-parties in your web application while protecting against XSS. The existing dependencies are on guava and JSR 305. The other jars are only needed by the test suite. The JSR 305 dependency is a compile-only dependency, only needed for annotations. This code was written with security best practices in mind, has an extensive test suite, and has undergone adversarial security review. A great place to get started using the OWASP Java HTML Sanitizer is here: https://github.com/OWASP/java-html-sanitizer/blob/master/docs/getting_started.md.

Benefits

  • Very easy to use. It allows for simple programmatic POSITIVE policy configuration (see below). No XML config.
  • Actively maintained by Mike Samuel from Google's AppSec team!
  • Passing 95+% of AntiSamy's unit tests plus many more.
  • This is code from the Caja project that was donated by Google. It is rather high performance and low memory utilization.
  • Java 1.5+
  • Provides 4X the speed of AntiSamy sanitization in DOM mode and 2X the speed of AntiSamy in SAX mode.

Licensing

The OWASP HTML Sanitizer is free to use and is dual licensed under the Apache 2 License and the New BSD License.

What is this?

The OWASP HTML Sanitizer Projects provides Java based HTML sanitization of untrusted HTML!

Code Repo

OWASP HTML Sanitizer at GitHub

Email List

Questions? Please sign up for our Project Support List

Project Leaders

Author/Project Leader
Mike Samuel @

Project Manager
Jim Manico @

Related Projects

Ohloh

Quick Download

v20160413.1 at Maven Central
v20160413.1 JAR
v20160413.1 JavaDoc

News and Events

  • [14 Apr 2016] v20160413.1 Released
  • [1 May 2015] Move to GitHub
  • [2 July 2014] v239 Released
  • [3 Mar 2014] v226 Released
  • [5 Feb 2014] New Wiki
  • [4 Sept 2013] v209 Released

Change Log

For recent release notes, please visit the changelog on GitHub.

Classifications

Owasp-incubator-trans-85.png Owasp-builders-small.png
Owasp-defenders-small.png
Apache 2 License
Project Type Files CODE.jpg

You can view a few basic prepackaged policies for links, tables, integers and images here: https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/Sanitizers.java. 

PolicyFactory policy = Sanitizers.FORMATTING.and(Sanitizers.LINKS);
String safeHTML = policy.sanitize(untrustedHTML);

or the tests show how to configure your own policy here: https://github.com/OWASP/java-html-sanitizer/blob/master/src/test/java/org/owasp/html/HtmlPolicyBuilderTest.java 

PolicyFactory policy = new HtmlPolicyBuilder()
   .allowElements("a")
   .allowUrlProtocols("https")
   .allowAttributes("href").onElements("a")
   .requireRelNofollowOnLinks()
   .build();
String safeHTML = policy.sanitize(untrustedHTML);

... or you can write custom policies to do things like changing h1s to divs with a certain class ... 

PolicyFactory policy = new HtmlPolicyBuilder()
   .allowElements("p")
   .allowElements(
       new ElementPolicy() {
         public String apply(String elementName, List<String> attrs) {
           attrs.add("class");
           attrs.add("header-" + elementName);
           return "div";
         }
       }, "h1", "h2", "h3", "h4", "h5", "h6"))
   .build();
String safeHTML = policy.sanitize(untrustedHTML);

You can also use the default "ebay" and "slashdot" policies. The Slashdot policy (defined here https://github.com/OWASP/java-html-sanitizer/blob/master/src/main/java/org/owasp/html/examples/SlashdotPolicyExample.java) allows the following tags ("a", "p", "div", "i", "b", "em", "blockquote", "tt", "strong"n "br", "ul", "ol", "li") and only certain attributes. This policy also allows for the custom slashdot tags, "quote" and "ecode".

How was this project tested?
This code was written with security best practices in mind, has an extensive test suite, and has undergone adversarial security review.

How is this project deployed?
This project is best deployed through Maven https://github.com/OWASP/java-html-sanitizer/blob/master/docs/getting_started.md

  • Maintaining a fully featured HTML sanitizer is a lot of work. We intend to continue to handle community questions and bug reports in a very timely manner.
  • There are no plans for major new features other than supporting incoming requests for advanced sanitization such as additional HTML5 support.
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