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hooks-proxy-demo.html
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hooks-proxy-demo.html
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<!doctype html>
<html>
<head>
<script src="../dist/purify.js"></script>
</head>
<body>
<!-- Our DIV to receive content -->
<div id="sanitized"></div>
<!-- Now let's sanitize that content -->
<script>
'use strict';
window.onload = () => {
const dirty = document.getElementById('payload').value;
const proxy = 'https://my.proxy/?url=';
const config = {
FORBID_TAGS: ['svg'],
WHOLE_DOCUMENT: true
};
const attributes = ['action', 'background', 'href', 'poster', 'src', 'srcset'];
const regex = /(url\("?)(?!data:)/gim;
const addStyles = (output, styles) => {
[...styles].reverse().forEach(style => {
if (styles[style]) {
const url = styles[style].replace(regex, `$1${proxy}`);
styles[style] = url;
output.push(`${style}:${styles[style]};`);
}
});
};
const addCSSRules = (output, cssRules) => {
[...cssRules].reverse().forEach(rule => {
switch (rule.type) {
case CSSRule.STYLE_RULE:
output.push(`${rule.selectorText}{`);
if (rule.style) addStyles(output, rule.style);
output.push('}');
break;
case CSSRule.MEDIA_RULE:
output.push(`@media ${rule.media.mediaText}{`);
addCSSRules(output, rule.cssRules);
output.push('}');
break;
case CSSRule.FONT_FACE_RULE:
output.push('@font-face {');
if (rule.style) addStyles(output, rule.style);
output.push('}');
break;
case CSSRule.KEYFRAMES_RULE:
output.push(`@keyframes ${rule.name}{`);
[...rule.cssRules].reverse().forEach(frame => {
if (frame.type === CSSRule.KEYFRAME_RULE && frame.keyText) {
output.push(`${frame.keyText}{`);
if (frame.style) addStyles(output, frame.style);
output.push('}');
}
});
output.push('}');
break;
default:
break;
}
});
};
const proxyAttribute = url => /^data:image\//.test(url) ? url : `${proxy}${escape(url)}`;
DOMPurify.addHook('uponSanitizeElement', (node, data) => {
if (data.tagName === 'style') {
const output = [];
addCSSRules(output, node.sheet.cssRules);
node.textContent = output.join("\n");
}
});
DOMPurify.addHook('afterSanitizeAttributes', node => {
attributes.forEach(attribute => {
if (node.hasAttribute(attribute)) {
node.setAttribute(attribute, proxyAttribute(node.getAttribute(attribute)));
}
});
if (node.hasAttribute('style')) {
const styles = node.style;
const output = [];
[...styles].reverse().forEach(style => {
if (styles[style] && regex.test(styles[style])) {
const url = styles[style].replace(regex, `$1${proxy}`);
styles[style] = url;
}
output.push(`${style}:${styles[style]};`);
});
node.setAttribute('style', output.join('') || node.removeAttribute('style'));
}
});
// Clean HTML string and write into our DIV
const clean = DOMPurify.sanitize(dirty, config);
document.getElementById('sanitized').innerHTML = clean;
};
</script>
<!-- Here we cage our payload in a TEXTAREA -->
<textarea id="payload">
<!DOCTYPE html SYSTEM "https://leaking.via/doctype">
<html xmlns="http://www.w3.org/1999/xhtml" manifest="https://leaking.via/html-manifest">
<head>
<!--
%Base (check manually)
-->
<base href="https://leaking.via/base-href/">
<!--
%MSIE Imports
-->
<?IMPORT namespace="myNS" implementation="https://leaking.via/import-implementation" ?>
<IMPORT namespace="myNS" implementation="https://leaking.via/import-implementation-2" />
<!--
%Redirects
-->
<meta http-equiv="refresh" content="10; url=http://leaking.via/meta-refresh">
<!--
%CSP
-->
<meta http-equiv="Content-Security-Policy" content="script-src 'self'; report-uri http://leaking.via/meta-csp-report-uri">
<meta http-equiv="Content-Security-Policy-Report-Only" content="script-src 'self'; report-uri http://leaking.via/meta-csp-report-uri-2">
<!--
%Reading View
-->
<meta name="copyright" content="<img src='https://leaking.via/meta-name-copyright-reading-view'>">
<meta name="displaydate" content="<img src='https://leaking.via/meta-name-displaydate-reading-view'>">
<meta property="og:site_name" content="<img src='https://leaking.via/meta-property-reading-view'>">
<!--
%Links
-->
<link rel="stylesheet" href="https://leaking.via/link-stylesheet" />
<link rel="icon" href="https://leaking.via/link-icon" />
<link rel="canonical" href="https://leaking.via/link-canonical" />
<link rel="shortcut icon" href="https://leaking.via/link-shortcut-icon" />
<link rel="import" href="https://leaking.via/link-import" />
<link rel="dns-prefetch" href="https://leaking.via/link-dns-prefetch" />
<link rel="preconnect" href="https://leaking.via/link-preconnect">
<link rel="prefetch" href="https://leaking.via/link-prefetch" />
<link rel="preload" href="https://leaking.via/link-preload" />
<link rel="prerender" href="https://leaking.via/link-prerender" />
<link rel="search" href="https://leaking.via/link-search" />
<!--
Note that OpenSearch description URLs are ignored in Chrome if this file isn't placed in the webroot.
Also, in Chrome, you won't see the request in the developer tools because the request happens in the privileged browser process.
Use a network sniffer to detect it.
-->
<link rel="alternate" href="https://leaking.via/link-alternate" />
<link rel="alternate" type="application/atom+xml" href="https://leaking.via/link-alternate-atom" />
<link rel="alternate stylesheet" href="https://leaking.via/link-alternate-stylesheet" />
<link rel="appendix" href="https://leaking.via/link-appendix" />
<link rel="apple-touch-icon-precomposed" href="https://leaking.via/link-apple-touch-icon-precomposed">
<link rel="apple-touch-icon" href="https://leaking.via/link-apple-touch-icon">
<link rel="archives" href="https://leaking.via/link-archives" />
<link rel="author" href="https://leaking.via/link-author" />
<link rel="bookmark" href="https://leaking.via/link-bookmark" />
<link rel="chapter" href="https://leaking.via/link-chapter" />
<link rel="contents" href="https://leaking.via/link-contents" />
<link rel="copyright" href="https://leaking.via/link-copyright" />
<link rel="entry-content" href="https://leaking.via/link-entry-content" />
<link rel="external" href="https://leaking.via/link-external" />
<link rel="feedurl" href="https://leaking.via/link-feedurl" />
<link rel="first" href="https://leaking.via/link-first" />
<link rel="glossary" href="https://leaking.via/link-glossary" />
<link rel="help" href="https://leaking.via/link-help" />
<link rel="index" href="https://leaking.via/link-index" />
<link rel="last" href="https://leaking.via/link-last" />
<link rel="manifest" href="https://leaking.via/link-manifest" />
<link rel="next" href="https://leaking.via/link-next" />
<link rel="offline" href="https://leaking.via/link-offline" />
<link rel="pingback" href="https://leaking.via/link-pingback" />
<link rel="prev" href="https://leaking.via/link-prev" />
<link rel="search" type="application/opensearchdescription+xml" href="https://leaking.via/link-search-2" title="Search" />
<link rel="sidebar" href="https://leaking.via/link-sidebar" />
<link rel="start" href="https://leaking.via/link-start" />
<link rel="section" href="https://leaking.via/link-section" />
<link rel="subsection" href="https://leaking.via/link-subsection" />
<link rel="subresource" href="https://leaking.via/link-subresource">
<link rel="tag" href="https://leaking.via/link-tag" />
<link rel="up" href="https://leaking.via/link-up" />
</head>
<!--
%Body Background
-->
<body background="https://leaking.via/body-background">
<!--
%Links & Maps
-->
<a ping="http://leaking.via/a-ping" href="#">You have to click me</a>
<img src="data:;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw" width="150" height="150" usemap="#map">
<map name="map">
<area ping="http://leaking.via/area-ping" shape="rect" coords="0,0,150,150" href="#">
</map>
<!--
The ping attribute allows to send a HTTP request to an external IP or domain,
even if the link's HREF points somewhere else. The link has to be clicked though
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-ping
-->
<!--
%Table Background
-->
<table background="https://leaking.via/table-background">
<tr>
<td background="https://leaking.via/td-background"></td>
</tr>
</table>
<!--
%Images
-->
<img src="https://leaking.via/img-src">
<img dynsrc="https://leaking.via/img-dynsrc">
<img lowsrc="https://leaking.via/img-lowsrc">
<img src="data:image/svg+xml,<svg%20xmlns='%68ttp:%2f/www.w3.org/2000/svg'%20xmlns:xlink='%68ttp:%2f/www.w3.org/1999/xlink'><image%20xlink:hr%65f='%68ttp:%2f/leaking.via/svg-via-data'></image></svg>">
<image src="https://leaking.via/image-src">
<image href="https://leaking.via/image-href">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image href="https://leaking.via/svg-image-href">
<image xlink:href="https://leaking.via/svg-image-xlink-href">
</svg>
<picture>
<source srcset="https://leaking.via/picture-source-srcset">
</picture>
<picture>
<img srcset="https://leaking.via/picture-img-srcset">
</picture>
<img srcset=",,,,,https://leaking.via/img-srcset">
<img src="#" longdesc="https://leaking.via/img-longdesc">
<!-- longdesc works on Firefox but requires right-click, "View Description" -->
<!--
%Forms
-->
<form action="https://leaking.via/form-action">
<button form="test" formaction="https://leaking.via/button-formaction">CLICKME</button>
</form>
<form id="test"></form>
<input type="image" src="https://leaking.via/input-src" name="test" value="test">
<isindex src="https://leaking.via/isindex" type="image">
<!--
%Media
-->
<bgsound src="https://leaking.via/bgsound-src"></bgsound>
<video src="https://leaking.via/video-src">
<track kind="subtitles" label="English subtitles" src="https://leaking.via/track-src" srclang="en" default></track>
</video>
<video controls>
<source src="https://leaking.via/video-source-src" type="video/mp4">
</video>
<audio controls>
<source src="https://leaking.via/audio-source-src" type="video/mp4">
</audio>
<video poster="https://leaking.via/video-poster" src="https://leaking.via/video-poster-2"></video>
<!--
%Object & Embed
-->
<object data="https://leaking.via/object-data"></object>
<object type="text/x-scriptlet" data="https://leaking.via/object-data-x-scriptlet"></object>
<object movie="https://leaking.via/object-movie" type="application/x-shockwave-flash"></object>
<object movie="https://leaking.via/object-movie">
<param name="type" value="application/x-shockwave-flash"></param>
</object>
<object codebase="https://leaking.via/object-codebase"></object>
<embed src="https://leaking.via/embed-src"></embed>
<embed code="https://leaking.via/embed-code"></embed>
<object classid="clsid:333C7BC4-460F-11D0-BC04-0080C7055A83">
<param name="DataURL" value="http://leaking.via/object-param-dataurl">
</object>
<!--
%Script
-->
<script src="https://leaking.via/script-src"></script>
<svg><script href="https://leaking.via/svg-script-href"></script></svg>
<svg><script xlink:href="https://leaking.via/svg-script-xlink-href"></script></svg>
<!--
%Frames
-->
<iframe src="https://leaking.via/iframe-src"></iframe>
<iframe src="data:image/svg+xml,<svg%20xmlns='%68ttp:%2f/www.w3.org/2000/svg'%20xmlns:xlink='%68ttp:%2f/www.w3.org/1999/xlink'><image%20xlink:hr%65f='%68ttps:%2f/leaking.via/svg-via-data'></image></svg>"></iframe>
<iframe srcdoc="<img src=https://leaking.via/iframe-srcdoc-img-src>"></iframe>
<frameset>
<frame src="https://leaking.via/frame-src"></frame>
</frameset>
<iframe src="view-source:https://leaking.via/iframe-src-viewsource"></iframe>
<!--
%CSS
-->
<style>
@import 'https://leaking.via/css-import-string';
@import url(https://leaking.via/css-import-url);
</style>
<style>
a:after {content: url(https://leaking.via/css-after-content)}
a::after {content: url(https://leaking.via/css-after-content-2)}
a:before {content: url(https://leaking.via/css-before-content)}
a::before {content: url(https://leaking.via/css-before-content-2)}
</style>
<a href="#">ABC</a>
<style>
big {
list-style: url(https://leaking.via/css-list-style);
list-style-image: url(https://leaking.via/css-list-style-image);
background: url(https://leaking.via/css-background);
background-image: url(https://leaking.via/css-background-image);
border-image: url(https://leaking.via/css-border-image);
border-image-source: url(https://leaking.via/css-border-image-source);
shape-outside: url(https://leaking.via/css-shape-outside);
cursor: url(https://leaking.via/css-cursor), auto;
}
</style>
<big>DEF</big>
<style>
@font-face {
font-family: leak;
src: url(https://leaking.via/css-font-face-src);
}
big {
font-family: leak;
}
</style>
<big>GHI</big>
<svg>
<style>
circle {
fill: url(https://leaking.via/svg-css-fill#foo);
mask: url(https://leaking.via/svg-css-mask#foo);
filter: url(https://leaking.via/svg-css-filter#foo);
clip-path: url(https://leaking.via/svg-css-clip-path#foo);
}
</style>
<circle r="40"></circle>
</svg>
<s foo="https://leaking.via/css-attr-notation">JKL</s>
<style>
s {
--leak: url(https://leaking.via/css-variables);
}
s {
background: var(--leak);
}
s::after {
content: attr(foo url);
}
s::before {
content: attr(notpresent, url(https://leaking.via/css-attr-fallback));
}
</style>
<style>
@media all, not print and not monochrome, (min-width: 1px) {
body {
background: url(https://leaking.via/css-media-query);
-webkit-animation: rotate-a-bit;
-webkit-animation-duration: 1s;
}
}
@media some garbage {
more garbage;
}
@-webkit-keyframes rotate-a-bit {
0% { transform: translate(0deg); background: url(https://leaking.via/keyframe-0) }
100% { transform: rotate(0deg); background: url(https://leaking.via/keyframe-100) }
}
</style>
<!--
%Inline CSS
-->
<b style="
list-style: url(https://leaking.via/inline-css-list-style);
list-style-image: url(https://leaking.via/inline-css-list-style-image);
background: url(https://leaking.via/inline-css-background);
background-image: url(https://leaking.via/inline-css-background-image);
border-image: url(https://leaking.via/inline-css-list-style-image);
border-image-source: url(https://leaking.via/inline-css-border-image-source);
shape-outside: url(https://leaking.via/inline-css-shape-outside);
cursor: url(https://leaking.via/inline-css-cursor), auto;
">JKL</b>
<svg>
<circle style="
fill: url(https://leaking.via/svg-inline-css-fill#foo);
mask: url(https://leaking.via/svg-inline-css-mask#foo);
filter: url(https://leaking.via/svg-inline-css-filter#foo);
clip-path: url(https://leaking.via/svg-inline-css-clip-path#foo);
"></circle>
</svg>
<!--
%Exotic Inline CSS
-->
<div style="background: url() url() url() url() url(https://leaking.via/inline-css-multiple-backgrounds);"></div>
<div style="behavior: url('https://leaking.via/inline-css-behavior');"></div>
<div style="-ms-behavior: url('https://leaking.via/inline-css-behavior-2');"></div>
<div style="background-image: image('https://leaking.via/inline-css-image-function')"></div>
<div style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader( src='https://leaking.via/inline-css-filter-alpha', sizingMethod='scale');" ></div>
<div style="filter:progid:DXImageTransform.Microsoft.ICMFilter(colorSpace='https://leaking.via/inline-css-filter-icm')"></div>
<!--
%Applet
-->
<applet code="Test" codebase="https://leaking.via/applet-codebase"></applet>
<applet code="Test" archive="https://leaking.via/applet-archive"></applet>
<applet code="Test" object="https://leaking.via/applet-object"></applet>
<!--
%SVG
-->
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<linearGradient id="Gradient">
<stop offset="0" stop-color="white" stop-opacity="0" />
<stop offset="1" stop-color="white" stop-opacity="1" />
</linearGradient>
<mask id="Mask">
<rect x="0" y="0" width="200" height="200" fill="url(https://leaking.via/svg-fill)" />
</mask>
</defs>
<rect x="0" y="0" width="200" height="200" fill="green" />
<rect x="0" y="0" width="200" height="200" fill="red" mask="url(https://leaking.via/svg-mask)" />
</svg>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image xmlns:xlink="http://www.w3.org/1999/xlink">
<set attributeName="xlink:href" begin="0s" to="https://leaking.via/svg-image-set" />
</image>
</svg>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image xmlns:xlink="http://www.w3.org/1999/xlink">
<animate attributeName="xlink:href" begin="0s" from="#" to="https://leaking.via/svg-image-animate" />
</image>
</svg>
<!--
%XSLT Stylesheets
-->
<?xml-stylesheet type="text/xsl" href="https://leaking.via/xslt-stylesheet" ?>
<!--
%Data Islands
-->
<xml src="https://leaking.via/xml-src" id="xml"></xml>
<div datasrc="#xml" datafld="$text" dataformatas="html"></div>
</textarea>
</body>
</html>