How did I came to this? In just one day? Well, I was wondering how to properly sanitize HTML, and the first hit on Google was HTML Purifier. After checking it out, I was burned out by the extensive configuration and whatever it needs to run, and updates are yearly, so I looked into others similar packages and I landed with Titouan Galopin's Sanitizer.
The package itself is easier to configure (it works around extensions, which are tag groups), and tags attributes can be further whitelisted (as it should be). It even has link protection and HTTPS enforcement. If no extension is set, all tags are wiped clean.
Now I can safely put a
<textarea></textarea> and stop praying the WYSIWYG editor does the heavy lifting or removing sh*t manually on the backend.
While I was tackling this I found a few solutions like bleach, html_sanitizer, and lxml's Cleaner. These libraries all work but I found that their performance on complicated HTML snippets were lacking because they needed to rely on html5lib for parsing HTML5. And completely normal content would get mangled without using html5lib.
After struggling with some other ideas, I ended up creating Python bindings around the bluemonday library: https://github.com/ColdHeat/pybluemonday
By letting Go do the hard parsing and sanitization work, the performance gains are significant.
❯ python benchmarks.py bleach (20000 sanitizations): 37.613802053 html_sanitizer (20000 sanitizations): 17.645683948 lxml Cleaner (20000 sanitizations): 10.500760227999997 pybluemonday (20000 sanitizations): 0.6188559669999876
This library is still experimental but it passes some tests (likely more of them) from bluemonday and html_sanitizer.
Hoping this helps people out and also hoping to get some feedback about the overall approach to the bindings.
I've always tought that user input sanitization shoud be performed server-side. But then, I watched this video about Google Search XSS by LiveOverflow.
From 1:52, he explains that it should be performed client-side because it would be very hard to do it server-side.
However, this only treats the case where you want to allow certain tags but not others, as in Gmail, for example (that example was mentionned at 1:22). But that's not the case for Google Search, right? So why would Google Search perform client-side sanitization, if they don't allow any html tags at all, and why couldn't they just encode every special character server-side? That would be basic, but sufficient protection as the search query is placed inside of the value attribute of an input tag.
Thanks in advance for your help!
I want to display untrusted HTML submitted by users. I want to avoid XSS.
It appears there are three solid libraries for this:
Does anyone have any opinion on the benefits/downsides of each of these solutions?
I've created a shard for sanitizing HTML (or XML) documents or fragments. If you have a web application that renders untrusted HTML you should make sure to have a sanitizer to prevent XSS attacks and other potentially harmfull doings. That includes rendering markdown.
Since this is a very typical application, there's a dedicated example how to integrate with Crystal's most popular Markdown shard `markd`.
I'm hoping to receive some reviews on this shard. This is quite a serious matter for production apps. So I'd appreciate anyone looking into it. Please try to break it =)
Besides having a solid filtering mechanism, a key component is to provide good defaults for common use cases. That's where the different [standard configurations](https://straight-shoota.github.io/sanitize/api/latest/Sanitize/Policy/HTMLSanitizer.html#configurations) come into play. Do they make sense for your use cases?
Okay! Here's the thing. I am learning about XSS attacks using bWAPP bugy platform. now I understand how XSS Reflected attacks work and I also learned some techniques to bypass some filters. But when I tried those techniques on the XSS Reflected (GET) with high level security, my payload get sanitized such as in the picture below.
I tried a list of 14XX payload using the intruder but nothing worked for me. the symboles < > and " changes to tags ( I guess that's what they call them) < >. I think they call this HTML encoding. I hope my question is much detailed as
I wanted to be. Thank you.
View the below link in a normal web browser and Reddhub: http://www.reddit.com/r/programming/comments/1rn85e
Note Fringe_Worthy's comment.
Hi everyone I'm thrilled to release Foundry Virtual Tabletop Beta 0.5.7, a minor update which is a stable Beta release for all Patreon supporters and Foundry license owners. Most importantly, this release marks a huge milestone, this is the last Foundry VTT update for Patreon supporters. Every update after this one will require a purchased license key to obtain. For everyone who supported the Foundry project during Beta I would like to personally thank you, regardless of whether you supported for one month, or for 22. It's been an incredible journey to get to this point and I would not have made it here without the Foundry community. I can share a few basic data points which highlight what an incredible whirlwind journey it has been:
I find these numbers pretty hard to believe, so I feel very fortunate to have made it this far with so many of you involved!
This stable update includes all of the changes from the 0.5.6 Update, if you are updating directly from 0.5.5 or earlier I advise you to read through those update notes first. The theme for this update revolves around bug fixes, adjustments, and stability improvements for the 0.5.6 changes.
I'm using a new routine of hosting a Developer Q&A on Twitch to review and showcase the new features each update. Thanks to everyone who joined me for the this installment, you can find the recorded broadcast on Twitch if you would like to watch and learn about the adjustments.
Please read the following important reminder about this update.
Many of you have arrived recently to the Foundry community you will... keep reading on reddit ➡
I cannot figure it out. any ideas?
... keep reading on reddit ➡
git push heroku development:main Enumerating objects: 903, done. Counting objects: 100% (903/903), done. Delta compression using up to 8 threads Compressing objects: 100% (856/856), done. Writing objects: 100% (903/903), 543.20 KiB | 5.72 MiB/s, done. Total 903 (delta 539), reused 0 (delta 0), pack-reused 0 remote: Compressing source files... done. remote: Building source: remote: remote: -----> Building on the Heroku-20 stack remote: -----> Determining which buildpack to use for this app remote: ! Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used. remote: Detected buildpacks: Ruby,Node.js remote: See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order remote: -----> Ruby app detected remote: -----> Installing bundler 2.2.21 remote: -----> Removing BUNDLED WITH version in the Gemfile.lock remote: -----> Compiling Ruby/Rails remote: -----> Using Ruby version: ruby-2.7.2 remote: -----> Installing dependencies using bundler 2.2.21 remote: Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4 remote: Fetching gem metadata from https://rubygems.org/ remote: Fetching gem metadata from https://rubygems.org/............ remote: Fetching rake 13.0.6 remote: Installing rake 13.0.6 remote: Fetching minitest 5.14.4 remote: Fetching zeitwerk 2.4.2 remote: Fetching builder 3.2.4 remote: Fetching concurrent-ruby 1.1.9 remote: Installing zeitwerk 2.4.2 remote: Installing builder 3.2.4 remote: Installing minitest 5.14.4 remote: Fetching erubi 1.10.0 remote: Installing concurrent-ruby 1.1.9 remote: Fetching mini_portile2 2.6.1 remote: Installing erubi 1.10.0 remote: Fetching racc 1.5.2 remote: Fetching crass 1.0.6 remote: Installing mini_portile2 2.6.1 remote: Installing crass 1.0.6 remote: Fetching rack 2.2.3 remote: Fetching nio4r 2.5.8 remote: Installing racc 1.5.2 with native extensions remote: Installing rack 2.2.3
Note: This release is available to Council Tier Patreon backers. A release for all Patreon backers will be along in a few days.
NOTE: This and future releases will REQUIRE node.js v12.x or higher!
(from Release Notes by /u/atropos_nyx)
Hi everyone, I'm extremely happy to share the Beta 0.5.2 update which is one of the biggest update versions ever clocking in with 89 issues closed in the GitLab milestone ranging encompassing new features, bug fixes, and API improvements. This is an even-numbered "major" update so it focuses heavily on adding new functionality and API changes to the software for testing by Alpha tier Patreon supporters.
The most significant improvements in this update version include a brand new permission control system, support for inline dice rolls, a built-in grid configuration tool, the ability to bulk upload assets, expanded Token features like light emission color, and many minor features.
Thank you all so very much for supporting my project and relying on Foundry Virtual Tabletop to bring us all together amidst health concerns and difficult times of social distancing. Please stay healthy, care for each other, and stay up to date on progress by following the project roadmap on GitLab: https://gitlab.com/foundrynet/foundryvtt/boards.
I'm a PHP beginner and I'm making a small system as a practice that fetches some texts from the SQL database. Some of the texts have HTML tags inside them like a, li, ul, strong, ... but I want to make sure that some dangerous ones like <script> are removed or turned into HTML entities so they are harmless.
What's the best way of sanitizing text when you want certain tags to be kept unchanged? A combination of the two, or just one (which one)?