81 lines
2.8 KiB
JavaScript
81 lines
2.8 KiB
JavaScript
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var config = require('./config')
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var uuid = require('uuid')
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var CspStrategy = {}
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var defaultDirectives = {
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defaultSrc: ['\'self\''],
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scriptSrc: ['\'self\'', 'vimeo.com', 'https://gist.github.com', 'www.slideshare.net', 'https://query.yahooapis.com', 'https://*.disqus.com', '\'unsafe-eval\''],
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// ^ TODO: Remove unsafe-eval - webpack script-loader issues https://github.com/hackmdio/hackmd/issues/594
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imgSrc: ['*'],
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styleSrc: ['\'self\'', '\'unsafe-inline\'', 'https://assets-cdn.github.com'], // unsafe-inline is required for some libs, plus used in views
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fontSrc: ['\'self\'', 'https://public.slidesharecdn.com'],
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objectSrc: ['*'], // Chrome PDF viewer treats PDFs as objects :/
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childSrc: ['*'],
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connectSrc: ['*']
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}
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var cdnDirectives = {
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scriptSrc: ['https://cdnjs.cloudflare.com', 'https://cdn.mathjax.org'],
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styleSrc: ['https://cdnjs.cloudflare.com', 'https://fonts.googleapis.com'],
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fontSrc: ['https://cdnjs.cloudflare.com', 'https://fonts.gstatic.com']
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}
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CspStrategy.computeDirectives = function () {
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var 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.usecdn, directives, cdnDirectives)
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if (!areAllInlineScriptsAllowed(directives)) {
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addInlineScriptExceptions(directives)
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}
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addUpgradeUnsafeRequestsOptionTo(directives)
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return directives
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}
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function mergeDirectives (existingDirectives, newDirectives) {
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for (var propertyName in newDirectives) {
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var newDirective = newDirectives[propertyName]
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if (newDirective) {
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var 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 areAllInlineScriptsAllowed (directives) {
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return directives.scriptSrc.indexOf('\'unsafe-inline\'') !== -1
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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-EtvSSxRwce5cLeFBZbvZvDrTiRoyoXbWWwvEVciM5Ag=\'')
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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) {
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directives.upgradeInsecureRequests = true
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} else if (config.csp.upgradeInsecureRequests === true) {
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directives.upgradeInsecureRequests = true
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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 = uuid.v4()
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next()
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}
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module.exports = CspStrategy
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