mirror of
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113 lines
3.8 KiB
JavaScript
113 lines
3.8 KiB
JavaScript
const config = require('./config')
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const { v4: uuidv4 } = require('uuid')
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const CspStrategy = {}
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const defaultDirectives = {
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defaultSrc: ['\'none\''],
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baseUri: ['\'self\''],
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connectSrc: ['\'self\''],
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fontSrc: ['\'self\''],
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manifestSrc: ['\'self\''],
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frameSrc: ['\'self\'', 'https://player.vimeo.com', 'https://www.slideshare.net/slideshow/embed_code/key/', 'https://www.youtube.com'],
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imgSrc: ['*'], // we allow using arbitrary images
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scriptSrc: [
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config.serverURL + '/build/',
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config.serverURL + '/js/',
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config.serverURL + '/config',
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'https://gist.github.com/',
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'https://vimeo.com/api/oembed.json',
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'https://www.slideshare.net/api/oembed/2',
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'\'unsafe-inline\'' // this is ignored by browsers supporting nonces/hashes
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],
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styleSrc: [config.serverURL + '/build/', config.serverURL + '/css/', '\'unsafe-inline\'', 'https://github.githubassets.com'], // unsafe-inline is required for some libs, plus used in views
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objectSrc: ['*'], // Chrome PDF viewer treats PDFs as objects :/
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formAction: ['\'self\''],
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mediaSrc: ['*']
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}
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const disqusDirectives = {
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scriptSrc: ['https://disqus.com', 'https://*.disqus.com', 'https://*.disquscdn.com'],
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styleSrc: ['https://*.disquscdn.com'],
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fontSrc: ['https://*.disquscdn.com']
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}
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const googleAnalyticsDirectives = {
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scriptSrc: ['https://www.google-analytics.com']
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}
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const dropboxDirectives = {
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scriptSrc: ['https://www.dropbox.com', '\'unsafe-inline\'']
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}
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const disallowFramingDirectives = {
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frameAncestors: ['\'self\'']
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}
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const allowPDFEmbedDirectives = {
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objectSrc: ['*'], // Chrome and Firefox treat PDFs as objects
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frameSrc: ['*'] // Chrome also checks PDFs against frame-src
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}
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CspStrategy.computeDirectives = function () {
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const directives = {}
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mergeDirectives(directives, config.csp.directives)
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mergeDirectivesIf(config.csp.addDefaults, directives, defaultDirectives)
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mergeDirectivesIf(config.csp.addDisqus, directives, disqusDirectives)
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mergeDirectivesIf(config.csp.addGoogleAnalytics, directives, googleAnalyticsDirectives)
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mergeDirectivesIf(config.dropbox.appKey, directives, dropboxDirectives)
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mergeDirectivesIf(!config.csp.allowFraming, directives, disallowFramingDirectives)
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mergeDirectivesIf(config.csp.allowPDFEmbed, directives, allowPDFEmbedDirectives)
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addInlineScriptExceptions(directives)
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addUpgradeUnsafeRequestsOptionTo(directives)
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addReportURI(directives)
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return directives
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}
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function mergeDirectives (existingDirectives, newDirectives) {
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for (const propertyName in newDirectives) {
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const newDirective = newDirectives[propertyName]
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if (newDirective) {
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const existingDirective = existingDirectives[propertyName] || []
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existingDirectives[propertyName] = existingDirective.concat(newDirective)
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}
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}
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}
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function mergeDirectivesIf (condition, existingDirectives, newDirectives) {
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if (condition) {
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mergeDirectives(existingDirectives, newDirectives)
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}
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}
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function addInlineScriptExceptions (directives) {
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directives.scriptSrc.push(getCspNonce)
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// TODO: This is the SHA-256 hash of the inline script in build/reveal.js/plugins/notes/notes.html
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// Any more clean solution appreciated.
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directives.scriptSrc.push('\'sha256-81acLZNZISnyGYZrSuoYhpzwDTTxi7vC1YM4uNxqWaM=\'')
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}
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function getCspNonce (req, res) {
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return '\'nonce-' + res.locals.nonce + '\''
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}
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function addUpgradeUnsafeRequestsOptionTo (directives) {
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if (config.csp.upgradeInsecureRequests === 'auto' && (config.useSSL || config.protocolUseSSL)) {
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directives.upgradeInsecureRequests = []
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} else if (config.csp.upgradeInsecureRequests === true) {
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directives.upgradeInsecureRequests = []
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}
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}
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function addReportURI (directives) {
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if (config.csp.reportURI) {
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directives.reportUri = config.csp.reportURI
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}
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}
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CspStrategy.addNonceToLocals = function (req, res, next) {
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res.locals.nonce = uuidv4()
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next()
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}
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module.exports = CspStrategy
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