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Disallow data and javascript URIs (#1186)

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* Disallow data and javascript URIs

Signed-off-by: Erik Michelson <github@erik.michelson.eu>
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Erik Michelson 2021-04-11 22:48:31 +02:00 committed by GitHub
parent 031e37325c
commit 7a21a26166
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2 changed files with 100 additions and 1 deletions
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93
cypress/integration/linkSchemes.ts Normal file
View file

@ -0,0 +1,93 @@
/*
* SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
describe('markdown formatted links to', () => {
beforeEach(() => {
cy.loadConfig()
cy.visitTestEditor()
})
it('external domains render as external link', () => {
cy.codemirrorFill('[external](https://hedgedoc.org/)')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'https://hedgedoc.org/')
.should('have.attr', 'rel', 'noreferer noopener')
.should('have.attr', 'target', '_blank')
})
it('note anchor references render as anchor link', () => {
cy.codemirrorFill('[anchor](#anchor)')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'http://127.0.0.1:3001/n/test#anchor')
})
it('internal pages render as internal link', () => {
cy.codemirrorFill('[internal](other-note)')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'http://127.0.0.1:3001/n/other-note')
})
it('data URIs do not render', () => {
cy.codemirrorFill('[data](data:text/plain,evil)')
cy.getMarkdownBody()
.find('a')
.should('not.exist')
})
it('javascript URIs do not render', () => {
cy.codemirrorFill('[js](javascript:alert("evil"))')
cy.getMarkdownBody()
.find('a')
.should('not.exist')
})
})
describe('HTML anchor element links to', () => {
beforeEach(() => {
cy.loadConfig()
cy.visitTestEditor()
})
it('external domains render as external link', () => {
cy.codemirrorFill('<a href="https://hedgedoc.org/">external</a>')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'https://hedgedoc.org/')
.should('have.attr', 'rel', 'noreferer noopener')
.should('have.attr', 'target', '_blank')
})
it('note anchor references render as anchor link', () => {
cy.codemirrorFill('<a href="#anchor">anchor</a>')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'http://127.0.0.1:3001/n/test#anchor')
})
it('internal pages render as internal link', () => {
cy.codemirrorFill('<a href="other-note">internal</a>')
cy.getMarkdownBody()
.find('a')
.should('have.attr', 'href', 'http://127.0.0.1:3001/n/other-note')
})
it('data URIs do not render', () => {
cy.codemirrorFill('<a href="data:text/plain,evil">data</a>')
cy.getMarkdownBody()
.find('a')
.should('not.exist')
})
it('javascript URIs do not render', () => {
cy.codemirrorFill('<a href="javascript:alert(\'evil\')">js</a>')
cy.getMarkdownBody()
.find('a')
.should('not.exist')
})
})

8
src/components/markdown-renderer/replace-components/link-replacer/link-replacer.tsx
View file

@ -25,7 +25,13 @@ export class LinkReplacer extends ComponentReplacer {
return undefined
}
const url = node.attribs.href
const url = node.attribs.href.trim()
// eslint-disable-next-line no-script-url
if (url.startsWith('data:') || url.startsWith('javascript:')) {
return <span>{ node.attribs.href }</span>
}
const isJumpMark = url.substr(0, 1) === '#'
const id = url.substr(1)