109 lines
3.0 KiB
JavaScript
109 lines
3.0 KiB
JavaScript
import DOMPurify from 'dompurify';
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import { getNormalizedURL, getBaseURL, relativePathToAbsolute } from '~/lib/utils/url_utility';
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const { sanitize: dompurifySanitize, addHook, isValidAttribute } = DOMPurify;
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export const defaultConfig = {
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// Safely allow SVG <use> tags
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ADD_TAGS: ['use', 'gl-emoji', 'copy-code'],
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// Prevent possible XSS attacks with data-* attributes used by @rails/ujs
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// See https://gitlab.com/gitlab-org/gitlab-ui/-/issues/1421
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FORBID_ATTR: [
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'data-remote',
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'data-url',
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'data-type',
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'data-method',
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'data-disable-with',
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'data-disabled',
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'data-disable',
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'data-turbo',
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],
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FORBID_TAGS: ['style', 'mstyle'],
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ALLOW_UNKNOWN_PROTOCOLS: true,
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};
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// Only icons urls from `gon` are allowed
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const getAllowedIconUrls = (gon = window.gon) =>
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[gon.sprite_file_icons, gon.sprite_icons]
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.filter(Boolean)
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.map((path) => relativePathToAbsolute(path, getBaseURL()));
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const isUrlAllowed = (url) =>
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getAllowedIconUrls().some((allowedUrl) => getNormalizedURL(url).startsWith(allowedUrl));
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const isHrefSafe = (url) => url.match(/^#/) || isUrlAllowed(url);
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const removeUnsafeHref = (node, attr) => {
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if (!node.hasAttribute(attr)) {
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return;
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}
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if (!isHrefSafe(node.getAttribute(attr))) {
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node.removeAttribute(attr);
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}
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};
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/**
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* Appends 'noopener' & 'noreferrer' to rel
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* attr values to prevent reverse tabnabbing.
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*
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* @param {String} rel
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* @returns {String}
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*/
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const appendSecureRelValue = (rel) => {
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const attributes = new Set(rel ? rel.toLowerCase().split(' ') : []);
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attributes.add('noopener');
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attributes.add('noreferrer');
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return Array.from(attributes).join(' ');
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};
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/**
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* Sanitize icons' <use> tag attributes, to safely include
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* svgs such as in:
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*
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* <svg viewBox="0 0 100 100">
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* <use href="/assets/icons-xxx.svg#icon_name"></use>
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* </svg>
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*
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* It validates both href & xlink:href attributes.
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* Note that `xlink:href` is deprecated, but still in use
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* https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/xlink:href
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*
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* @param {Object} node - Node to sanitize
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*/
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const sanitizeSvgIcon = (node) => {
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removeUnsafeHref(node, 'href');
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removeUnsafeHref(node, 'xlink:href');
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};
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addHook('afterSanitizeAttributes', (node) => {
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if (node.tagName.toLowerCase() === 'use') {
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sanitizeSvgIcon(node);
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}
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});
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const TEMPORARY_ATTRIBUTE = 'data-temp-href-target';
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addHook('beforeSanitizeAttributes', (node) => {
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if (node.tagName === 'A' && node.hasAttribute('target')) {
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node.setAttribute(TEMPORARY_ATTRIBUTE, node.getAttribute('target'));
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}
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});
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addHook('afterSanitizeAttributes', (node) => {
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if (node.tagName === 'A' && node.hasAttribute(TEMPORARY_ATTRIBUTE)) {
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node.setAttribute('target', node.getAttribute(TEMPORARY_ATTRIBUTE));
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node.removeAttribute(TEMPORARY_ATTRIBUTE);
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if (node.getAttribute('target') === '_blank') {
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const rel = node.getAttribute('rel');
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node.setAttribute('rel', appendSecureRelValue(rel));
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}
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}
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});
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export const sanitize = (val, config) => dompurifySanitize(val, { ...defaultConfig, ...config });
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export { isValidAttribute };
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