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feat: add security warnings to sandboxed renderers (#14869)

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Also refactor not to use the remote module.
This commit is contained in:
Milan Burda 2018-10-03 21:36:12 +02:00 • committed by Alexey Kuzmin
commit 5efb0fdff1
5 changed files with 327 additions and 224 deletions
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8
lib/browser/rpc-server.js
View file

@ -475,3 +475,11 @@ ipcMain.on('ELECTRON_BROWSER_SANDBOX_LOAD', function (event) {
}
}
})
ipcMain.on('ELECTRON_BROWSER_GET_LAST_WEB_PREFERENCES', function (event) {
try {
event.returnValue = [null, event.sender.getLastWebPreferences()]
} catch (error) {
event.returnValue = [errorUtils.serialize(error)]
}
})

30
lib/renderer/init.js
View file

@ -27,18 +27,6 @@ v8Util.setHiddenValue(global, 'ipc', new events.EventEmitter())
// Use electron module after everything is ready.
const { ipcRenderer } = require('electron')
const {
warnAboutNodeWithRemoteContent,
warnAboutDisabledWebSecurity,
warnAboutInsecureContentAllowed,
warnAboutExperimentalFeatures,
warnAboutEnableBlinkFeatures,
warnAboutInsecureResources,
warnAboutInsecureCSP,
warnAboutAllowedPopups,
shouldLogSecurityWarnings
} = require('@electron/internal/renderer/security-warnings')
require('@electron/internal/renderer/web-frame-init')()
// Process command line arguments.
@ -168,23 +156,7 @@ for (const preloadScript of preloadScripts) {
}
// Warn about security issues
window.addEventListener('load', function loadHandler () {
if (shouldLogSecurityWarnings()) {
if (nodeIntegration === 'true') {
warnAboutNodeWithRemoteContent()
}
warnAboutDisabledWebSecurity()
warnAboutInsecureResources()
warnAboutInsecureContentAllowed()
warnAboutExperimentalFeatures()
warnAboutEnableBlinkFeatures()
warnAboutInsecureCSP()
warnAboutAllowedPopups()
}
window.removeEventListener('load', loadHandler)
})
require('@electron/internal/renderer/security-warnings')(nodeIntegration === 'true')
// Report focus/blur events of webview to browser.
// Note that while Chromium content APIs have observer for focus/blur, they

94
lib/renderer/security-warnings.js
View file

@ -77,41 +77,17 @@ const isUnsafeEvalEnabled = function () {
})
}
/**
* Attempts to get the current webContents. Returns null
* if that fails
*
* @returns {Object|null} webPreferences
*/
let webPreferences
const getWebPreferences = function () {
try {
if (webPreferences) {
return webPreferences
}
const { remote } = require('electron')
webPreferences = remote.getCurrentWebContents().getLastWebPreferences()
return webPreferences
} catch (error) {
return null
}
}
const moreInformation = `\nFor more information and help, consult
https://electronjs.org/docs/tutorial/security.\n This warning will not show up
once the app is packaged.`
module.exports = {
shouldLogSecurityWarnings,
/**
* #1 Only load secure content
*
* Checks the loaded resources on the current page and logs a
* message about all resources loaded over HTTP or FTP.
*/
warnAboutInsecureResources: () => {
const warnAboutInsecureResources = function () {
if (!window || !window.performance || !window.performance.getEntriesByType) {
return
}
@ -133,7 +109,7 @@ module.exports = {
console.warn('%cElectron Security Warning (Insecure Resources)',
'font-weight: bold;', warning)
},
}
/**
* #2 on the checklist: Disable the Node.js integration in all renderers that
@ -141,7 +117,9 @@ module.exports = {
*
* Logs a warning message about Node integration.
*/
warnAboutNodeWithRemoteContent: () => {
const warnAboutNodeWithRemoteContent = function (nodeIntegration) {
if (!nodeIntegration) return
if (getIsRemoteProtocol()) {
const warning = `This renderer process has Node.js integration enabled
and attempted to load remote content from '${window.location}'. This
@ -150,7 +128,7 @@ module.exports = {
console.warn('%cElectron Security Warning (Node.js Integration with Remote Content)',
'font-weight: bold;', warning)
}
},
}
// Currently missing since it has ramifications and is still experimental:
// #3 Enable context isolation in all renderers that display remote content
@ -163,8 +141,7 @@ module.exports = {
*
* Logs a warning message about disabled webSecurity.
*/
warnAboutDisabledWebSecurity: () => {
const webPreferences = getWebPreferences()
const warnAboutDisabledWebSecurity = function (webPreferences) {
if (!webPreferences || webPreferences.webSecurity !== false) return
const warning = `This renderer process has "webSecurity" disabled. This
@ -172,7 +149,7 @@ module.exports = {
console.warn('%cElectron Security Warning (Disabled webSecurity)',
'font-weight: bold;', warning)
},
}
/**
* #6 on the checklist: Define a Content-Security-Policy and use restrictive
@ -182,7 +159,7 @@ module.exports = {
*
* Logs a warning message about unset or insecure CSP
*/
warnAboutInsecureCSP: () => {
const warnAboutInsecureCSP = function () {
isUnsafeEvalEnabled().then((enabled) => {
if (!enabled) return
@ -193,15 +170,14 @@ module.exports = {
console.warn('%cElectron Security Warning (Insecure Content-Security-Policy)',
'font-weight: bold;', warning)
})
},
}
/**
* #8 on the checklist: Do not set allowRunningInsecureContent to true
*
* Logs a warning message about disabled webSecurity.
*/
warnAboutInsecureContentAllowed: () => {
const webPreferences = getWebPreferences()
const warnAboutInsecureContentAllowed = function (webPreferences) {
if (!webPreferences || !webPreferences.allowRunningInsecureContent) return
const warning = `This renderer process has "allowRunningInsecureContent"
@ -210,15 +186,14 @@ module.exports = {
console.warn('%cElectron Security Warning (allowRunningInsecureContent)',
'font-weight: bold;', warning)
},
}
/**
* #9 on the checklist: Do not enable experimental features
*
* Logs a warning message about experimental features.
*/
warnAboutExperimentalFeatures: () => {
const webPreferences = getWebPreferences()
const warnAboutExperimentalFeatures = function (webPreferences) {
if (!webPreferences || (!webPreferences.experimentalFeatures)) {
return
}
@ -229,15 +204,14 @@ module.exports = {
console.warn('%cElectron Security Warning (experimentalFeatures)',
'font-weight: bold;', warning)
},
}
/**
* #10 on the checklist: Do not use enableBlinkFeatures
*
* Logs a warning message about enableBlinkFeatures
*/
warnAboutEnableBlinkFeatures: () => {
const webPreferences = getWebPreferences()
const warnAboutEnableBlinkFeatures = function (webPreferences) {
if (webPreferences === null ||
!webPreferences.hasOwnProperty('enableBlinkFeatures') ||
webPreferences.enableBlinkFeatures.length === 0) {
@ -250,14 +224,14 @@ module.exports = {
console.warn('%cElectron Security Warning (enableBlinkFeatures)',
'font-weight: bold;', warning)
},
}
/**
* #11 on the checklist: Do Not Use allowpopups
*
* Logs a warning message about allowed popups
*/
warnAboutAllowedPopups: () => {
const warnAboutAllowedPopups = function () {
if (document && document.querySelectorAll) {
const domElements = document.querySelectorAll('[allowpopups]')
@ -277,4 +251,38 @@ module.exports = {
// Currently missing since we can't easily programmatically check for it:
// #12WebViews: Verify the options and params of all `<webview>` tags
const logSecurityWarnings = function (webPreferences, nodeIntegration) {
warnAboutNodeWithRemoteContent(nodeIntegration)
warnAboutDisabledWebSecurity(webPreferences)
warnAboutInsecureResources()
warnAboutInsecureContentAllowed(webPreferences)
warnAboutExperimentalFeatures(webPreferences)
warnAboutEnableBlinkFeatures(webPreferences)
warnAboutInsecureCSP()
warnAboutAllowedPopups()
}
const getWebPreferences = function () {
const { ipcRenderer } = require('electron')
const errorUtils = require('@electron/internal/common/error-utils')
const [ error, result ] = ipcRenderer.sendSync('ELECTRON_BROWSER_GET_LAST_WEB_PREFERENCES')
if (error) {
console.warn(`getLastWebPreferences() failed: ${errorUtils.deserialize(error)}`)
return null
} else {
return result
}
}
module.exports = function (nodeIntegration) {
const loadHandler = function () {
if (shouldLogSecurityWarnings()) {
const webPreferences = getWebPreferences()
logSecurityWarnings(webPreferences, nodeIntegration)
}
}
window.addEventListener('load', loadHandler, { once: true })
}

3
lib/sandboxed_renderer/init.js
View file

@ -115,3 +115,6 @@ if (preloadSrc) {
} else if (preloadError) {
console.error(preloadError.stack)
}
// Warn about security issues
require('@electron/internal/renderer/security-warnings')()

114
spec/security-warnings-spec.js
View file

@ -84,6 +84,22 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about disabled webSecurity (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
webSecurity: false,
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('Disabled webSecurity'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about insecure Content-Security-Policy', (done) => {
w = new BrowserWindow({
show: false,
@ -101,6 +117,23 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about insecure Content-Security-Policy (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('Insecure Content-Security-Policy'), message)
done()
})
useCsp = false
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about allowRunningInsecureContent', (done) => {
w = new BrowserWindow({
show: false,
@ -117,6 +150,22 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about allowRunningInsecureContent (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
allowRunningInsecureContent: true,
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('allowRunningInsecureContent'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about experimentalFeatures', (done) => {
w = new BrowserWindow({
show: false,
@ -133,6 +182,22 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about experimentalFeatures (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
experimentalFeatures: true,
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('experimentalFeatures'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about enableBlinkFeatures', (done) => {
w = new BrowserWindow({
show: false,
@ -149,6 +214,22 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about enableBlinkFeatures (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
enableBlinkFeatures: ['my-cool-feature'],
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('enableBlinkFeatures'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/base-page-security.html`)
})
it('should warn about allowpopups', (done) => {
w = new BrowserWindow({
show: false,
@ -164,9 +245,24 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/webview-allowpopups.html`)
})
it('should warn about allowpopups (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('allowpopups'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/webview-allowpopups.html`)
})
it('should warn about insecure resources', (done) => {
w = new BrowserWindow({
show: true,
show: false,
webPreferences: {
nodeIntegration: false
}
@ -179,4 +275,20 @@ describe('security warnings', () => {
w.loadURL(`http://127.0.0.1:8881/insecure-resources.html`)
w.webContents.openDevTools()
})
it('should warn about insecure resources (sandboxed)', (done) => {
w = new BrowserWindow({
show: false,
webPreferences: {
sandbox: true
}
})
w.webContents.once('console-message', (e, level, message) => {
assert(message.includes('Insecure Resources'), message)
done()
})
w.loadURL(`http://127.0.0.1:8881/insecure-resources.html`)
w.webContents.openDevTools()
})
})