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Signed-off-by: Yannick Bungers <git@innay.de> Signed-off-by: David Mehren <dmehren1@gmail.com>
106 lines
3.9 KiB
TypeScript
106 lines
3.9 KiB
TypeScript
import { config } from './config'
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import { IHelmetContentSecurityPolicyDirectives } from 'helmet'
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import uuid from 'uuid'
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import { NextFunction, Request, Response } from 'express'
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type CSPDirectives = IHelmetContentSecurityPolicyDirectives
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const 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', '\'unsafe-eval\''],
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// ^ TODO: Remove unsafe-eval - webpack script-loader issues https://github.com/hackmdio/codimd/issues/594
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imgSrc: ['*'],
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styleSrc: ['\'self\'', '\'unsafe-inline\'', 'https://github.githubassets.com'], // unsafe-inline is required for some libs, plus used in views
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fontSrc: ['\'self\'', 'data:', 'https://public.slidesharecdn.com'],
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objectSrc: ['*'], // Chrome PDF viewer treats PDFs as objects :/
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mediaSrc: ['*'],
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childSrc: ['*'],
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connectSrc: ['*']
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}
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const 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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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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function mergeDirectives (existingDirectives: CSPDirectives, newDirectives: CSPDirectives): void {
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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: boolean, existingDirectives: CSPDirectives, newDirectives: CSPDirectives): void {
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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: CSPDirectives): boolean {
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if (directives.scriptSrc) {
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return directives.scriptSrc.includes('\'unsafe-inline\'')
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}
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return false
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}
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function getCspNonce (req: Request, res: Response): string {
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return "'nonce-" + res.locals.nonce + "'"
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}
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function addInlineScriptExceptions (directives: CSPDirectives): void {
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if (!directives.scriptSrc) {
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directives.scriptSrc = []
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}
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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 addUpgradeUnsafeRequestsOptionTo (directives: CSPDirectives): void {
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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): void {
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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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export function addNonceToLocals (req: Request, res: Response, next: NextFunction): void {
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res.locals.nonce = uuid.v4()
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next()
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}
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export function computeDirectives (): CSPDirectives {
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const directives: CSPDirectives = {}
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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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mergeDirectivesIf(config.csp.addDisqus, directives, disqusDirectives)
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mergeDirectivesIf(config.csp.addGoogleAnalytics, directives, googleAnalyticsDirectives)
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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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