efa490a50f
This option is needed as it's currently not possible to add an report URI by the directives array. This option also allows to get CSP reports not only on docker based setup but also on our heroku instances. Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>
87 lines
2.9 KiB
JavaScript
87 lines
2.9 KiB
JavaScript
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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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 (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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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 = uuid.v4()
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next()
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}
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module.exports = CspStrategy
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