init CSP

Signed-off-by: eternal-flame-AD <yume@yumechi.jp>

packages/backend/src/config.ts

@@ -9,6 +9,7 @@ import { dirname, resolve } from 'node:path';
 import * as yaml from 'js-yaml';
 import * as Sentry from '@sentry/node';
 import type { RedisOptions } from 'ioredis';
+import { type CSPHashed, hashResource, hashSourceFile } from './server/csp.js';
 
 type RedisOptionsSource = Partial<RedisOptions> & {
 	host: string;
@@ -154,6 +155,8 @@ export type Config = {
 	proxyRemoteFiles: boolean | undefined;
 	signToActivityPubGet: boolean | undefined;
 
+	cspPrerenderedContent: Map<string, CSPHashed>,
+
 	version: string;
 	gitDescribe: string;
 	gitCommit: string;
@@ -235,6 +238,15 @@ export function loadConfig(): Config {
 		: null;
 	const internalMediaProxy = `${scheme}://${host}/proxy`;
 	const redis = convertRedisOptions(config.redis, host);
+	const htmlScriptPrelude = `var VERSION = ${JSON.stringify(version)}; var CLIENT_ENTRY = ${JSON.stringify(frontendManifest['src/_boot_.ts'].file)};`;
+	const cspPrerenderedContent = new Map([
+		[
+			'.prelude.js', hashResource(htmlScriptPrelude)
+		],
+		...['boot.js', 'style.css', 'style.embed.css', 'boot.embed.js',
+			'bios.css', 'bios.js', 'cli.css', 'cli.js', 'error.css'
+		].map((file) => [file, hashSourceFile(`${_dirname}/server/web/${file}`)] as [string, CSPHashed]),
+	]);
 
 	return {
 		version,
@@ -248,6 +260,7 @@ export function loadConfig(): Config {
 		chmodSocket: config.chmodSocket,
 		disableHsts: config.disableHsts,
 		hstsPreload: config.hstsPreload ?? false,
+		cspPrerenderedContent,
 		host,
 		hostname,
 		scheme,

packages/backend/src/server/csp.ts

@@ -0,0 +1,63 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { createHash } from 'crypto';
+import { readFileSync } from 'fs';
+
+export type CSPHashed = {
+    content: string,
+    integrity: string,
+};
+
+export function generateCSP(hashedMap: Map<string, CSPHashed>, options: {
+    mediaProxy ?: string,
+}) {
+    const keys = Array.from(hashedMap.keys());
+    const scripts = keys
+        .filter(name => name.endsWith('.js'))
+        .map(name => `'${hashedMap.get(name)!.integrity}'`);
+    const styles = keys
+        .filter(name => name.endsWith('.css'))
+        .map(name => `'${hashedMap.get(name)!.integrity}'`);
+
+    return ([
+        ['default-src', ['\'self\'']],
+        ['img-src', ['\'self\'', 'data:', options.mediaProxy].filter(Boolean)],
+        ['media-src', ['\'self\'', 'data:', options.mediaProxy].filter(Boolean)],
+        ['font-src', ['\'self\'']],
+        ['style-src', ['\'self\'', ...styles]],
+        ['script-src', ['\'self\'', ...scripts]],
+        ['object-src', ['\'none\'']],
+        ['frame-src', ['\'none\'']],
+        ['base-uri', ['\'self\'']],
+        ['form-action', ['\'self\'']],
+        ['child-src', ['\'self\'']],
+        ['form-action', ['\'self\'']],
+        ['manifest-src', ['\'self\'']],
+        ...(process.env.NODE_ENV === 'production' ? 
+                [
+                    ['upgrade-insecure-requests', []],
+                ] : []),
+    ] as [string, string[]][])
+    .map(([name, values]) => {
+        return `${name} ${values.join(' ')}`;
+    }).join('; ');
+}
+
+export function hashResource(res: string): CSPHashed {
+    const sha256 = createHash('sha256');
+
+    sha256.update(res);
+
+    const content = res;
+    const integrity = `sha256-${sha256.digest('base64')}`;
+    return { content, integrity };
+}
+
+export function hashSourceFile(file: string): CSPHashed {
+    const content = readFileSync(file, 'utf8');
+
+    return hashResource(content);
+}

packages/backend/src/server/web/ClientServerService.ts

@@ -67,6 +67,7 @@ import { UrlPreviewService } from './UrlPreviewService.js';
 import { ClientLoggerService } from './ClientLoggerService.js';
 import type { FastifyInstance, FastifyPluginOptions, FastifyReply } from 'fastify';
 import { makeHstsHook } from '../hsts.js';
+import { generateCSP } from '../csp.js';
 
 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
@@ -234,6 +235,18 @@ export class ClientServerService {
 			fastify.addHook('onRequest', makeHstsHook(host, preload));
 		}
 
+		// CSP
+		if (process.env.NODE_ENV === 'production') {
+			console.debug('cspPrerenderedContent', this.config.cspPrerenderedContent);
+			const generatedCSP = generateCSP(this.config.cspPrerenderedContent, {
+				mediaProxy: this.config.mediaProxy ? `https://${new URL(this.config.mediaProxy).host}` : undefined,
+			});
+			fastify.addHook('onRequest', (_, reply, done) => {
+				reply.header('Content-Security-Policy', generatedCSP);
+				done();
+			});
+		}
+
 		// Authenticate
 		fastify.addHook('onRequest', async (request, reply) => {
 			if (request.routeOptions.url == null) {

packages/backend/src/server/web/views/base-embed.pug

@@ -1,7 +1,10 @@
 block vars
 
 block loadClientEntry
-	- const entry = config.frontendEmbedEntry;
+    - const entry = config.frontendEntry
+	- const styleCSS = config.cspPrerenderedContent['style.embed.css']
+	- const bootJS = config.cspPrerenderedContent['boot.embed.js']
+	- const jsPrelude = config.cspPrerenderedContent['baseHtmlJSPrelude']
 
 doctype html
 
@@ -35,12 +38,9 @@ html(class='embed')
 		block meta
 			meta(name='robots' content='noindex')
 
-		style
-			include ../style.embed.css
+		style(integrity=styleCSS.integrity) !{styleCSS.content}
 
-		script.
-			var VERSION = "#{version}";
-			var CLIENT_ENTRY = "#{entry.file}";
+		script(integrity=jsPrelude.integrity) !{jsPrelude.content}
 
 		script(type='application/json' id='misskey_meta' data-generated-at=now)
 			!= metaJson
@@ -48,8 +48,7 @@ html(class='embed')
 		script(type='application/json' id='misskey_embedCtx' data-generated-at=now)
 			!= embedCtx
 
-		script
-			include ../boot.embed.js
+		script(integrity=bootJS.integrity) !{bootJS.content}
 
 	body
 		noscript: p

packages/backend/src/server/web/views/base.pug

@@ -2,7 +2,9 @@ block vars
 
 block loadClientEntry
 	- const entry = config.frontendEntry;
-	- const baseUrl = config.url;
+	- const styleCSS = config.cspPrerenderedContent.get('style.css');
+	- const jsPrelude = config.cspPrerenderedContent.get('.prelude.js');
+	- const bootJS = config.cspPrerenderedContent.get('boot.js');
 
 doctype html
 
@@ -64,18 +66,14 @@ html
 			meta(property='og:image'       content= img)
 			meta(property='twitter:card'   content='summary')
 
-		style
-			include ../style.css
+		style(integrity=styleCSS.integrity) !{styleCSS.content}
 
-		script.
-			var VERSION = "#{version}";
-			var CLIENT_ENTRY = "#{entry.file}";
+		script(integrity=jsPrelude.integrity) !{jsPrelude.content}
 
 		script(type='application/json' id='misskey_meta' data-generated-at=now)
 			!= metaJson
 
-		script
-			include ../boot.js
+		script(integrity=bootJS.integrity) !{bootJS.content}
 
 	body
 		noscript: p