[MM-59552] Remove unsafe-inline from internal CSP, replace with nonce and rework some dynamic styling (#3120)

* Remove unsafe-inline

* Fix dynamic dark mode loading

* Include nonce generator for CSP for styles

* Add nonce provider for react-select

* Fix test

package-lock.json

@@ -10,6 +10,7 @@
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
+        "@emotion/react": "11.11.4",
         "@mattermost/compass-icons": "0.1.45",
         "auto-launch": "5.0.6",
         "bootstrap": "4.6.1",
@@ -88,7 +89,7 @@
     },
     "api-types": {
       "name": "@mattermost/desktop-api",
-      "version": "5.9.0-1",
+      "version": "5.10.0-1",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {

package.json

@@ -159,6 +159,7 @@
     "webpack-merge": "5.8.0"
   },
   "dependencies": {
+    "@emotion/react": "11.11.4",
     "@mattermost/compass-icons": "0.1.45",
     "auto-launch": "5.0.6",
     "bootstrap": "4.6.1",

src/common/communication.ts

@@ -191,3 +191,5 @@ export const GET_MEDIA_ACCESS_STATUS = 'get-media-access-status';
 
 // Legacy code remove signal
 export const LEGACY_OFF = 'legacy-off';
+
+export const GET_NONCE = 'get-nonce';

src/main/app/initialize.test.js

@@ -64,6 +64,9 @@ jest.mock('electron', () => ({
     },
     session: {
         defaultSession: {
+            webRequest: {
+                onHeadersReceived: jest.fn(),
+            },
             setSpellCheckerDictionaryDownloadURL: jest.fn(),
             setPermissionRequestHandler: jest.fn(),
             on: jest.fn(),

src/main/app/initialize.ts

@@ -45,6 +45,7 @@ import {configPath, updatePaths} from 'main/constants';
 import CriticalErrorHandler from 'main/CriticalErrorHandler';
 import downloadsManager from 'main/downloadsManager';
 import i18nManager from 'main/i18nManager';
+import NonceManager from 'main/nonceManager';
 import {getDoNotDisturb} from 'main/notifications';
 import parseArgs from 'main/ParseArgs';
 import PermissionsManager from 'main/permissionsManager';
@@ -313,6 +314,20 @@ async function initializeAfterAppReady() {
 
     app.setAppUserModelId('Mattermost.Desktop'); // Use explicit AppUserModelID
     const defaultSession = session.defaultSession;
+    defaultSession.webRequest.onHeadersReceived((details, callback) => {
+        const url = parseURL(details.url);
+        if (url?.protocol === 'mattermost-desktop:' && url?.pathname.endsWith('html')) {
+            callback({
+                responseHeaders: {
+                    ...details.responseHeaders,
+                    'Content-Security-Policy': [`default-src 'self'; style-src 'self' 'nonce-${NonceManager.create(details.url)}'; media-src data:; img-src 'self' data:`],
+                },
+            });
+            return;
+        }
+
+        downloadsManager.webRequestOnHeadersReceivedHandler(details, callback);
+    });
 
     if (process.platform !== 'darwin') {
         defaultSession.on('spellcheck-dictionary-download-failure', (event, lang) => {

src/main/nonceManager.ts

@@ -0,0 +1,34 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {ipcMain} from 'electron';
+import type {IpcMainInvokeEvent} from 'electron';
+import {v4 as uuid} from 'uuid';
+
+import {GET_NONCE} from 'common/communication';
+
+export class NonceManager {
+    private nonces: Map<string, string>;
+
+    constructor() {
+        this.nonces = new Map();
+
+        ipcMain.handle(GET_NONCE, this.handleGetNonce);
+    }
+
+    create = (url: string) => {
+        const nonce = uuid();
+        this.nonces.set(url, nonce);
+        return nonce;
+    };
+
+    private handleGetNonce = (event: IpcMainInvokeEvent) => {
+        const url = event.sender.getURL();
+        const nonce = this.nonces.get(url);
+        this.nonces.delete(url);
+        return nonce;
+    };
+}
+
+const nonceManager = new NonceManager();
+export default nonceManager;

src/main/preload/internalAPI.js

@@ -91,6 +91,7 @@ import {
     OPEN_WINDOWS_MICROPHONE_PREFERENCES,
     GET_MEDIA_ACCESS_STATUS,
     VIEW_FINISHED_RESIZING,
+    GET_NONCE,
 } from 'common/communication';
 
 console.log('Preload initialized');
@@ -124,6 +125,7 @@ contextBridge.exposeInMainWorld('desktop', {
     goBack: () => ipcRenderer.send(HISTORY, -1),
     checkForUpdates: () => ipcRenderer.send(CHECK_FOR_UPDATES),
     updateConfiguration: (saveQueueItems) => ipcRenderer.send(UPDATE_CONFIGURATION, saveQueueItems),
+    getNonce: () => ipcRenderer.invoke(GET_NONCE),
 
     updateServerOrder: (serverOrder) => ipcRenderer.send(UPDATE_SERVER_ORDER, serverOrder),
     updateTabOrder: (serverId, viewOrder) => ipcRenderer.send(UPDATE_TAB_ORDER, serverId, viewOrder),

src/main/views/downloadsDropdownView.ts

@@ -66,7 +66,6 @@ export class DownloadsDropdownView {
         }});
 
         this.view.webContents.loadURL('mattermost-desktop://renderer/downloadsDropdown.html');
-        this.view.webContents.session.webRequest.onHeadersReceived(downloadsManager.webRequestOnHeadersReceivedHandler);
         MainWindow.get()?.addBrowserView(this.view);
     };
 

src/renderer/components/SettingsPage.tsx

@@ -6,6 +6,9 @@
 
 import 'renderer/css/settings.css';
 
+import createCache from '@emotion/cache';
+import {CacheProvider} from '@emotion/react';
+import type {EmotionCache} from '@emotion/react';
 import React from 'react';
 import {FormCheck, Col, FormGroup, FormText, Container, Row, Button, FormControl, Modal} from 'react-bootstrap';
 import type {IntlShape} from 'react-intl';
@@ -39,6 +42,7 @@ type State = DeepPartial<CombinedConfig> & {
     availableLanguages: Array<{label: string; value: string}>;
     availableSpellcheckerLanguages: Array<{label: string; value: string}>;
     canUpgrade?: boolean;
+    cache?: EmotionCache;
 }
 
 type SavingStateItems = {
@@ -127,6 +131,13 @@ class SettingsPage extends React.PureComponent<Props, State> {
             availableLanguages.sort((a, b) => a.label.localeCompare(b.label));
             this.setState({availableLanguages});
         });
+
+        window.desktop.getNonce().then((nonce) => {
+            this.setState({cache: createCache({
+                key: 'react-select-cache',
+                nonce,
+            })});
+        });
     }
 
     getConfig = () => {
@@ -426,6 +437,10 @@ class SettingsPage extends React.PureComponent<Props, State> {
     render() {
         const {intl} = this.props;
 
+        if (!this.state.cache) {
+            return null;
+        }
+
         const settingsPage = {
             close: {
                 textDecoration: 'none',
@@ -581,22 +596,24 @@ class SettingsPage extends React.PureComponent<Props, State> {
                     </FormText>
                 </FormCheck>
                 {this.state.useSpellChecker &&
-                    <ReactSelect
-                        inputId='inputSpellCheckerLocalesDropdown'
-                        className='SettingsPage__spellCheckerLocalesDropdown'
-                        classNamePrefix='SettingsPage__spellCheckerLocalesDropdown'
-                        options={this.state.availableSpellcheckerLanguages}
-                        isMulti={true}
-                        isClearable={false}
-                        onChange={this.handleChangeSpellCheckerLocales}
-                        value={this.selectedSpellCheckerLocales}
-                        placeholder={
-                            <FormattedMessage
-                                id='renderer.components.settingsPage.checkSpelling.preferredLanguages'
-                                defaultMessage='Select preferred language(s)'
-                            />
-                        }
-                    />
+                    <CacheProvider value={this.state.cache}>
+                        <ReactSelect
+                            inputId='inputSpellCheckerLocalesDropdown'
+                            className='SettingsPage__spellCheckerLocalesDropdown'
+                            classNamePrefix='SettingsPage__spellCheckerLocalesDropdown'
+                            options={this.state.availableSpellcheckerLanguages}
+                            isMulti={true}
+                            isClearable={false}
+                            onChange={this.handleChangeSpellCheckerLocales}
+                            value={this.selectedSpellCheckerLocales}
+                            placeholder={
+                                <FormattedMessage
+                                    id='renderer.components.settingsPage.checkSpelling.preferredLanguages'
+                                    defaultMessage='Select preferred language(s)'
+                                />
+                            }
+                        />
+                    </CacheProvider>
                 }
             </>,
         );

src/renderer/components/TabBar.tsx

@@ -32,6 +32,10 @@ type Props = {
     intl: IntlShape;
 };
 
+type State = {
+    nonce?: string;
+}
+
 function getStyle(style?: DraggingStyle | NotDraggingStyle) {
     if (style?.transform) {
         const axisLockX = `${style.transform.slice(0, style.transform.indexOf(','))}, 0px)`;
@@ -43,7 +47,12 @@ function getStyle(style?: DraggingStyle | NotDraggingStyle) {
     return style;
 }
 
-class TabBar extends React.PureComponent<Props> {
+class TabBar extends React.PureComponent<Props, State> {
+    constructor(props: Props) {
+        super(props);
+        this.state = {};
+    }
+
     onCloseTab = (id: string) => {
         return (event: React.MouseEvent<HTMLButtonElement>) => {
             event.stopPropagation();
@@ -51,7 +60,19 @@ class TabBar extends React.PureComponent<Props> {
         };
     };
 
+    componentDidMount(): void {
+        window.desktop.getNonce().then((nonce) => {
+            this.setState({
+                nonce,
+            });
+        });
+    }
+
     render() {
+        if (!this.state.nonce) {
+            return null;
+        }
+
         const tabs = this.props.tabs.map((tab, index) => {
             const sessionExpired = this.props.sessionsExpired[tab.id!];
             const hasUnreads = this.props.unreadCounts[tab.id!];
@@ -145,7 +166,10 @@ class TabBar extends React.PureComponent<Props> {
         });
 
         return (
-            <DragDropContext onDragEnd={this.props.onDrop}>
+            <DragDropContext
+                nonce={this.state.nonce}
+                onDragEnd={this.props.onDrop}
+            >
                 <Droppable
                     isDropDisabled={this.props.tabsDisabled}
                     droppableId='tabBar'

src/renderer/css/lazy/modals-dark.lazy.css

@@ -1,36 +0,0 @@
-@import '~bootstrap-dark/src/bootstrap-dark.css';
-
-body {
-    background-color: transparent;
-}
-
-.SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__control {
-    background: #242a30;
-}
-
-.SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__menu {
-    background: #242a30;
-}
-
-.SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__option {
-    background: #242a30;
-}
-
-.SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__option:hover {
-    background: rgba(255, 255, 255, 0.16);
-}
-
-#settingsModal .modal-body  {
-    overflow-y: auto;
-    overflow-x: hidden;
-    scrollbar-width: thin;
-    scrollbar-color: var(--light) rgba(255, 255, 255, 0);
-}
-
-.Toggle .Toggle___switch {
-    background: rgba(var(--center-channel-bg-rgb), 0.24);
-}
-
-.Toggle .Toggle___switch.disabled {
-    background: rgba(var(--center-channel-bg-rgb), 0.08);
-}

src/renderer/css/modals-dark.scss

@@ -0,0 +1,38 @@
+@use 'sass:meta';
+
+.darkMode {
+    @include meta.load-css('bootstrap-dark/src/bootstrap-dark.css');
+    color: #fff;
+
+    .SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__control {
+        background: #242a30;
+    }
+    
+    .SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__menu {
+        background: #242a30;
+    }
+    
+    .SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__option {
+        background: #242a30;
+    }
+    
+    .SettingsPage__spellCheckerLocalesDropdown .SettingsPage__spellCheckerLocalesDropdown__option:hover {
+        background: rgba(255, 255, 255, 0.16);
+    }
+    
+    #settingsModal .modal-body  {
+        overflow-y: auto;
+        overflow-x: hidden;
+        scrollbar-width: thin;
+        scrollbar-color: var(--light) rgba(255, 255, 255, 0);
+    }
+    
+    .Toggle___switch {
+        background: rgba(var(--center-channel-bg-rgb), 0.24);
+    }
+    
+    .Toggle___switch.disabled {
+        background: rgba(var(--center-channel-bg-rgb), 0.08);
+    }
+}
+

src/renderer/dropdown.tsx

@@ -29,6 +29,7 @@ type State = {
     hasGPOServers?: boolean;
     isAnyDragging: boolean;
     windowBounds?: Electron.Rectangle;
+    nonce?: string;
 }
 
 function getStyle(style?: DraggingStyle | NotDraggingStyle) {
@@ -141,6 +142,9 @@ class ServerDropdown extends React.PureComponent<Record<string, never>, State> {
         window.desktop.serverDropdown.requestInfo();
         window.addEventListener('click', this.closeMenu);
         window.addEventListener('keydown', this.handleKeyboardShortcuts);
+        window.desktop.getNonce().then((nonce) => {
+            this.setState({nonce});
+        });
     }
 
     componentDidUpdate() {
@@ -231,6 +235,10 @@ class ServerDropdown extends React.PureComponent<Record<string, never>, State> {
     };
 
     render() {
+        if (!this.state.nonce) {
+            return null;
+        }
+
         return (
             <IntlProvider>
                 <div
@@ -256,6 +264,7 @@ class ServerDropdown extends React.PureComponent<Record<string, never>, State> {
                     </div>
                     <hr className='ServerDropdown__divider'/>
                     <DragDropContext
+                        nonce={this.state.nonce}
                         onDragStart={this.onDragStart}
                         onDragEnd={this.onDragEnd}
                     >

src/renderer/index.html

@@ -2,7 +2,6 @@
 <html>
     <head>
         <meta charset="utf-8">
-        <meta http-equiv="Content-Security-Policy" content="default-src 'self'; style-src 'self' 'unsafe-inline'; media-src data:; img-src 'self' data:">
         <title><%= htmlWebpackPlugin.options.title %></title>
     </head>
     <body>

src/renderer/modals/darkMode.ts

@@ -1,14 +1,14 @@
 // Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
-import darkStyles from 'renderer/css/lazy/modals-dark.lazy.css';
+import 'renderer/css/modals-dark.scss';
 
 export default function addDarkModeListener() {
     const setDarkMode = (darkMode: boolean) => {
         if (darkMode) {
-            darkStyles.use();
+            document.body.classList.add('darkMode');
         } else {
-            darkStyles.unuse();
+            document.body.classList.remove('darkMode');
         }
     };
     window.desktop.onDarkModeChange(setDarkMode);

src/types/window.ts

@@ -44,6 +44,7 @@ declare global {
             goBack: () => void;
             checkForUpdates: () => void;
             updateConfiguration: (saveQueueItems: SaveQueueItem[]) => void;
+            getNonce: () => Promise<string | undefined>;
 
             updateServerOrder: (serverOrder: string[]) => Promise<void>;
             updateTabOrder: (serverId: string, viewOrder: string[]) => Promise<void>;

webpack.config.renderer.js

@@ -152,7 +152,14 @@ module.exports = merge(base, {
             use: [
                 MiniCssExtractPlugin.loader,
                 'css-loader',
-                'sass-loader',
+                {
+                    loader: 'sass-loader',
+                    options: {
+                        sassOptions: {
+                            includePaths: [path.resolve(__dirname, 'node_modules')],
+                        },
+                    },
+                },
             ],
         }, {
             test: /\.mp3$/,