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Code Issues Releases Activity

Add validation to opening URLs in external desktop handler (fix #1459)

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This commit is contained in:
Ronan Jouchet 2022-09-17 22:22:19 -04:00
parent eecc33c1aa
commit 840fe4a199
10 changed files with 204 additions and 39 deletions
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2
app/src/components/contextMenu.ts
View File

@ -18,7 +18,7 @@ export function initContextMenu(
options: OutputOptions,
window?: BrowserWindow,
): void {
log.debug('initContextMenu', { options, window });
log.debug('initContextMenu');
// eslint-disable-next-line @typescript-eslint/no-unsafe-call
contextMenu({

2
app/src/components/menu.ts
View File

@ -45,7 +45,7 @@ export function createMenu(
options: OutputOptions,
mainWindow: BrowserWindow,
): void {
log.debug('createMenu', { options, mainWindow });
log.debug('createMenu', { options });
const menuTemplate = generateMenu(options, mainWindow);
injectBookmarks(menuTemplate);

67
app/src/helpers/helpers.test.ts
View File

@ -1,9 +1,14 @@
import { shell } from 'electron';
jest.mock('./windowHelpers');
import {
linkIsInternal,
getCounterValue,
removeUserAgentSpecifics,
cleanupPlainText,
getCounterValue,
linkIsInternal,
openExternal,
removeUserAgentSpecifics,
} from './helpers';
import { showNavigationBlockedMessage } from './windowHelpers';
const internalUrl = 'https://medium.com/';
const internalUrlWww = 'https://www.medium.com/';
@ -285,3 +290,59 @@ describe('cleanupPlainText', () => {
expect(cleanupPlainText(' this is a test ')).toBe('this is a test');
});
});
describe('openExternal', () => {
const mockShellOpenExternal: jest.SpyInstance = jest.spyOn(
shell,
'openExternal',
);
const mockShowNavigationBlockedMessage: jest.SpyInstance =
showNavigationBlockedMessage as jest.Mock;
beforeEach(() => {
mockShellOpenExternal.mockReset();
mockShowNavigationBlockedMessage
.mockReset()
.mockReturnValue(Promise.resolve(undefined));
});
afterAll(() => {
mockShellOpenExternal.mockRestore();
mockShowNavigationBlockedMessage.mockRestore();
});
test('https urls scheme should *not* be blocked', async () => {
await openExternal('https://whatever.foo');
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockShellOpenExternal).toHaveBeenCalled();
});
test('urls with whitelisted scheme should *not* be blocked', async () => {
await openExternal('ircs://irc.libera.chat/whatever');
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockShellOpenExternal).toHaveBeenCalled();
});
test('urls with non-allowlisted scheme *should* be blocked', async () => {
await openExternal('barf://whatever.foo');
expect(mockShowNavigationBlockedMessage).toHaveBeenCalledTimes(1);
expect(mockShellOpenExternal).not.toHaveBeenCalled();
});
test('potentially-malicious urls *should* be blocked', async () => {
await openExternal('https://hello.com/wor%00ld');
expect(mockShowNavigationBlockedMessage).toHaveBeenCalledTimes(1);
expect(mockShellOpenExternal).not.toHaveBeenCalled();
});
test('malformed urls *should* be blocked', async () => {
await openExternal('zombocom');
expect(mockShowNavigationBlockedMessage).toHaveBeenCalledTimes(1);
expect(mockShellOpenExternal).not.toHaveBeenCalled();
});
});

90
app/src/helpers/helpers.ts
View File

@ -5,9 +5,80 @@ import * as path from 'path';
import { BrowserWindow, OpenExternalOptions, shell } from 'electron';
import * as log from '../helpers/loggingHelper';
import { showNavigationBlockedMessage } from './windowHelpers';
export const INJECT_DIR = path.join(__dirname, '..', 'inject');
// Taken from Firefox's. Location might vary in codebase, search for one of them, e.g.
// https://searchfox.org/mozilla-central/search?q=%22xmpp%22&path=&case=false&regexp=false
const SAFE_URL_PROTOCOLS_FIREFOX = [
'bitcoin:',
'ftp:',
'ftps:',
'geo:',
'im:',
'irc:',
'ircs:',
'magnet:',
'mailto:',
'matrix:',
'mms:',
'news:',
'nntp:',
'openpgp4fpr:',
'sftp:',
'sip:',
'sms:',
'smsto:',
'ssh:',
'tel:',
'urn:',
'webcal:',
'wtai:',
'xmpp:',
];
const SAFE_URL_PROTOCOLS = ['http:', 'https:', ...SAFE_URL_PROTOCOLS_FIREFOX];
const SHELL_SAFETY_FEEDBACK_STR =
'If you believe this URL should open, you might be right, and our validation might be excessive.' +
'Please share this error & URL at https://github.com/nativefier/nativefier/issues/1459';
export function isUrlShellSafe(
urlToGo: string,
): { blocked: false } | { blocked: true; reason: string } {
let url: URL;
try {
url = new URL(urlToGo.toLowerCase());
} catch (err: unknown) {
return {
blocked: true,
reason: `URL appears malformed. ${SHELL_SAFETY_FEEDBACK_STR}`,
};
}
if (!SAFE_URL_PROTOCOLS.includes(url.protocol)) {
return {
blocked: true,
reason: `URL protocol is disallowed. ${SHELL_SAFETY_FEEDBACK_STR}`,
};
}
// https://cwe.mitre.org/data/definitions/177.html
if (
urlToGo.includes('%00') ||
urlToGo.includes('%0a') ||
urlToGo.includes('%2e') ||
urlToGo.includes('%2f') ||
urlToGo.includes('%5c')
) {
return {
blocked: true,
reason: `URL might be malicious. ${SHELL_SAFETY_FEEDBACK_STR}`,
};
}
return { blocked: false };
}
/**
* Helper to print debug messages from the main process in the browser window
*/
@ -166,11 +237,28 @@ export function nativeTabsSupported(): boolean {
return isOSX();
}
/**
* Open the given external protocol URL in the desktop's default manner
* (e.g. `mailto:` URLs in the user's default mail agent), with extra validation.
*/
export function openExternal(
url: string,
options?: OpenExternalOptions,
): Promise<void> {
log.debug('openExternal', { url, options });
const urlShellSafety = isUrlShellSafe(url);
log.debug('openExternal', { url, options, urlShellSafety });
if (urlShellSafety.blocked) {
return new Promise((resolve) => {
showNavigationBlockedMessage(
`Navigation blocked to ${url}\n\n${urlShellSafety.reason}`,
)
.then(() => resolve())
.catch((err: unknown) => {
throw err;
});
});
}
return shell.openExternal(url, options);
}

44
app/src/helpers/windowEvents.test.ts
View File

@ -31,7 +31,7 @@ const {
onWillPreventUnload: (event: unknown) => void;
} = jest.requireActual('./windowEvents');
import {
blockExternalURL,
showNavigationBlockedMessage,
createAboutBlankWindow,
createNewTab,
} from './windowHelpers';
@ -49,7 +49,8 @@ describe('onNewWindowHelper', () => {
targetUrl: originalURL,
zoom: 1.0,
};
const mockBlockExternalURL: jest.SpyInstance = blockExternalURL as jest.Mock;
const mockShowNavigationBlockedMessage: jest.SpyInstance =
showNavigationBlockedMessage as jest.Mock;
const mockCreateAboutBlank: jest.SpyInstance =
createAboutBlankWindow as jest.Mock;
const mockCreateNewTab: jest.SpyInstance = createNewTab as jest.Mock;
@ -63,7 +64,7 @@ describe('onNewWindowHelper', () => {
const setupWindow = jest.fn();
beforeEach(() => {
mockBlockExternalURL
mockShowNavigationBlockedMessage
.mockReset()
.mockReturnValue(Promise.resolve(undefined));
mockCreateAboutBlank.mockReset();
@ -76,7 +77,7 @@ describe('onNewWindowHelper', () => {
});
afterAll(() => {
mockBlockExternalURL.mockRestore();
mockShowNavigationBlockedMessage.mockRestore();
mockCreateAboutBlank.mockRestore();
mockCreateNewTab.mockRestore();
mockLinkIsInternal.mockRestore();
@ -95,7 +96,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).not.toHaveBeenCalled();
});
@ -113,7 +114,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).toHaveBeenCalledTimes(1);
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -134,7 +135,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).toHaveBeenCalledTimes(1);
expect(mockShowNavigationBlockedMessage).toHaveBeenCalledTimes(1);
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -150,7 +151,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).not.toHaveBeenCalled();
});
@ -168,7 +169,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).toHaveBeenCalledTimes(1);
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -193,7 +194,7 @@ describe('onNewWindowHelper', () => {
true,
undefined,
);
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -218,7 +219,7 @@ describe('onNewWindowHelper', () => {
false,
undefined,
);
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -234,7 +235,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).toHaveBeenCalledTimes(1);
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -250,7 +251,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).toHaveBeenCalledTimes(1);
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});
@ -266,7 +267,7 @@ describe('onNewWindowHelper', () => {
expect(mockCreateAboutBlank).not.toHaveBeenCalled();
expect(mockCreateNewTab).not.toHaveBeenCalled();
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).not.toHaveBeenCalled();
});
@ -277,13 +278,14 @@ describe('onWillNavigate', () => {
const internalURL = 'https://medium.com/topics/technology';
const externalURL = 'https://www.wikipedia.org/wiki/Electron';
const mockBlockExternalURL: jest.SpyInstance = blockExternalURL as jest.Mock;
const mockShowNavigationBlockedMessage: jest.SpyInstance =
showNavigationBlockedMessage as jest.Mock;
const mockLinkIsInternal: jest.SpyInstance = linkIsInternal as jest.Mock;
const mockOpenExternal: jest.SpyInstance = openExternal as jest.Mock;
const preventDefault = jest.fn();
beforeEach(() => {
mockBlockExternalURL
mockShowNavigationBlockedMessage
.mockReset()
.mockReturnValue(Promise.resolve(undefined));
mockLinkIsInternal.mockReset().mockReturnValue(false);
@ -292,7 +294,7 @@ describe('onWillNavigate', () => {
});
afterAll(() => {
mockBlockExternalURL.mockRestore();
mockShowNavigationBlockedMessage.mockRestore();
mockLinkIsInternal.mockRestore();
mockOpenExternal.mockRestore();
});
@ -306,7 +308,7 @@ describe('onWillNavigate', () => {
const event = { preventDefault };
await onWillNavigate(options, event, internalURL);
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).not.toHaveBeenCalled();
});
@ -319,12 +321,12 @@ describe('onWillNavigate', () => {
const event = { preventDefault };
await onWillNavigate(options, event, externalURL);
expect(mockBlockExternalURL).not.toHaveBeenCalled();
expect(mockShowNavigationBlockedMessage).not.toHaveBeenCalled();
expect(mockOpenExternal).toHaveBeenCalledTimes(1);
expect(preventDefault).toHaveBeenCalledTimes(1);
});
test('external urls should be ignored if blockExternalUrls is true', async () => {
test('external urls should be blocked if blockExternalUrls is true', async () => {
const options = {
blockExternalUrls: true,
targetUrl: originalURL,
@ -332,7 +334,7 @@ describe('onWillNavigate', () => {
const event = { preventDefault };
await onWillNavigate(options, event, externalURL);
expect(mockBlockExternalURL).toHaveBeenCalledTimes(1);
expect(mockShowNavigationBlockedMessage).toHaveBeenCalledTimes(1);
expect(mockOpenExternal).not.toHaveBeenCalled();
expect(preventDefault).toHaveBeenCalledTimes(1);
});

12
app/src/helpers/windowEvents.ts
View File

@ -9,12 +9,12 @@ import {
import { linkIsInternal, nativeTabsSupported, openExternal } from './helpers';
import * as log from './loggingHelper';
import {
blockExternalURL,
createAboutBlankWindow,
createNewTab,
injectCSS,
sendParamsOnDidFinishLoad,
setProxyRules,
showNavigationBlockedMessage,
} from './windowHelpers';
import { WindowOptions } from '../../../shared/src/options/model';
@ -86,7 +86,9 @@ export function onNewWindowHelper(
preventDefault();
if (options.blockExternalUrls) {
return new Promise((resolve) => {
blockExternalURL(urlToGo)
showNavigationBlockedMessage(
`Navigation to external URL blocked by options: ${urlToGo}`,
)
.then(() => resolve())
.catch((err: unknown) => {
throw err;
@ -129,7 +131,7 @@ export function onWillNavigate(
event: Event,
urlToGo: string,
): Promise<void> {
log.debug('onWillNavigate', { options, event, urlToGo });
log.debug('onWillNavigate', urlToGo);
if (
!linkIsInternal(
options.targetUrl,
@ -141,7 +143,9 @@ export function onWillNavigate(
event.preventDefault();
if (options.blockExternalUrls) {
return new Promise((resolve) => {
blockExternalURL(urlToGo)
showNavigationBlockedMessage(
`Navigation to external URL blocked by options: ${urlToGo}`,
)
.then(() => resolve())
.catch((err: unknown) => {
throw err;

6
app/src/helpers/windowHelpers.ts
View File

@ -23,12 +23,14 @@ export function adjustWindowZoom(adjustment: number): void {
});
}
export function blockExternalURL(url: string): Promise<MessageBoxReturnValue> {
export function showNavigationBlockedMessage(
message: string,
): Promise<MessageBoxReturnValue> {
return new Promise((resolve, reject) => {
withFocusedWindow((focusedWindow) => {
dialog
.showMessageBox(focusedWindow, {
message: `Cannot navigate to external URL: ${url}`,
message,
type: 'error',
title: 'Navigation blocked',
})

12
app/src/main.ts
View File

@ -438,14 +438,14 @@ app.on(
},
);
app.on('browser-window-blur', (event: Event, window: BrowserWindow) => {
log.debug('app.browser-window-blur', { event, window });
app.on('browser-window-blur', () => {
log.debug('app.browser-window-blur');
});
app.on('browser-window-created', (event: Event, window: BrowserWindow) => {
log.debug('app.browser-window-created', { event, window });
app.on('browser-window-created', () => {
log.debug('app.browser-window-created');
});
app.on('browser-window-focus', (event: Event, window: BrowserWindow) => {
log.debug('app.browser-window-focus', { event, window });
app.on('browser-window-focus', () => {
log.debug('app.browser-window-focus');
});

7
app/src/mocks/electron.ts
View File

@ -144,10 +144,17 @@ class MockWebRequest {
class InternalEmitter extends EventEmitter {}
const mockShell = {
openExternal(url: string, options?: unknown): Promise<void> {
return new Promise((resolve) => resolve());
},
};
export {
MockDialog as dialog,
MockBrowserWindow as BrowserWindow,
MockSession as Session,
MockWebContents as WebContents,
MockWebRequest as WebRequest,
mockShell as shell,
};

1
package.json
View File

@ -52,6 +52,7 @@
"test:noplaywright": "jest --testPathIgnorePatterns=playwright",
"test:unit": "jest",
"test:watch": "echo 'Remember to run npm run build:watch for the test watcher to work!' && jest --watchAll --collectCoverage=false",
"test:watch:unit": "echo 'Remember to run npm run build:watch for the test watcher to work!' && jest --watchAll --collectCoverage=false --testPathIgnorePatterns=integration --testPathIgnorePatterns=playwright",
"test:withlog": "LOGLEVEL=trace npm run test",
"test": "jest",
"watch": "npx concurrently \"npm:*:watch\""