HackMD/app.js
Sheogorath 714504618c
Add referrer policy
This commit adds a referrer policy to all requests.

The usage of `same-origin` allows HackMD to still interpret all requests
and this way not break anything. But it prevents 3rd party scripts,
pictures and more to get informations that may lead to not secured note.

It has to be mentioned that this maybe breaks some features of the
Google Analytics embedding. This has to be tested.

Fixes #724

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>
2018-02-12 01:59:48 +01:00

279 lines
7.6 KiB
JavaScript

'use strict'
// app
// external modules
var express = require('express')
var ejs = require('ejs')
var passport = require('passport')
var methodOverride = require('method-override')
var cookieParser = require('cookie-parser')
var compression = require('compression')
var session = require('express-session')
var SequelizeStore = require('connect-session-sequelize')(session.Store)
var fs = require('fs')
var path = require('path')
var morgan = require('morgan')
var passportSocketIo = require('passport.socketio')
var helmet = require('helmet')
var i18n = require('i18n')
var flash = require('connect-flash')
// core
var config = require('./lib/config')
var logger = require('./lib/logger')
var response = require('./lib/response')
var models = require('./lib/models')
var csp = require('./lib/csp')
// generate front-end constants by template
var constpath = path.join(__dirname, './public/js/lib/common/constant.ejs')
var data = {
domain: config.domain,
urlpath: config.urlpath,
debug: config.debug,
version: config.version,
GOOGLE_API_KEY: config.google.clientSecret,
GOOGLE_CLIENT_ID: config.google.clientID,
DROPBOX_APP_KEY: config.dropbox.appKey,
allowedUploadMimeTypes: config.allowedUploadMimeTypes
}
ejs.renderFile(constpath, data, {}, function (err, str) {
if (err) throw new Error(err)
fs.writeFileSync(path.join(__dirname, './public/build/constant.js'), str)
})
// server setup
var app = express()
var server = null
if (config.usessl) {
var ca = (function () {
var i, len, results
results = []
for (i = 0, len = config.sslcapath.length; i < len; i++) {
results.push(fs.readFileSync(config.sslcapath[i], 'utf8'))
}
return results
})()
var options = {
key: fs.readFileSync(config.sslkeypath, 'utf8'),
cert: fs.readFileSync(config.sslcertpath, 'utf8'),
ca: ca,
dhparam: fs.readFileSync(config.dhparampath, 'utf8'),
requestCert: false,
rejectUnauthorized: false
}
server = require('https').createServer(options, app)
} else {
server = require('http').createServer(app)
}
// logger
app.use(morgan('combined', {
'stream': logger
}))
// socket io
var io = require('socket.io')(server)
io.engine.ws = new (require('uws').Server)({
noServer: true,
perMessageDeflate: false
})
// others
var realtime = require('./lib/realtime.js')
// assign socket io to realtime
realtime.io = io
// methodOverride
app.use(methodOverride('_method'))
// session store
var sessionStore = new SequelizeStore({
db: models.sequelize
})
// compression
app.use(compression())
// use hsts to tell https users stick to this
if (config.hsts.enable) {
app.use(helmet.hsts({
maxAge: config.hsts.maxAgeSeconds * 1000,
includeSubdomains: config.hsts.includeSubdomains,
preload: config.hsts.preload
}))
} else if (config.usessl) {
logger.info('Consider enabling HSTS for extra security:')
logger.info('https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security')
}
// Add referrer policy to improve privacy
app.use(
helmet.referrerPolicy({
policy: 'same-origin'
})
)
// Generate a random nonce per request, for CSP with inline scripts
app.use(csp.addNonceToLocals)
// use Content-Security-Policy to limit XSS, dangerous plugins, etc.
// https://helmetjs.github.io/docs/csp/
if (config.csp.enable) {
app.use(helmet.contentSecurityPolicy({
directives: csp.computeDirectives()
}))
} else {
logger.info('Content-Security-Policy is disabled. This may be a security risk.')
}
i18n.configure({
locales: ['en', 'zh', 'zh-CN', 'zh-TW', 'fr', 'de', 'ja', 'es', 'ca', 'el', 'pt', 'it', 'tr', 'ru', 'nl', 'hr', 'pl', 'uk', 'hi', 'sv', 'eo', 'da'],
cookie: 'locale',
directory: path.join(__dirname, '/locales')
})
app.use(cookieParser())
app.use(i18n.init)
// routes without sessions
// static files
app.use('/', express.static(path.join(__dirname, '/public'), { maxAge: config.staticcachetime }))
// session
app.use(session({
name: config.sessionname,
secret: config.sessionsecret,
resave: false, // don't save session if unmodified
saveUninitialized: true, // always create session to ensure the origin
rolling: true, // reset maxAge on every response
cookie: {
maxAge: config.sessionlife
},
store: sessionStore
}))
// session resumption
var tlsSessionStore = {}
server.on('newSession', function (id, data, cb) {
tlsSessionStore[id.toString('hex')] = data
cb()
})
server.on('resumeSession', function (id, cb) {
cb(null, tlsSessionStore[id.toString('hex')] || null)
})
// middleware which blocks requests when we're too busy
app.use(require('./lib/web/middleware/tooBusy'))
app.use(flash())
// passport
app.use(passport.initialize())
app.use(passport.session())
// check uri is valid before going further
app.use(require('./lib/web/middleware/checkURIValid'))
// redirect url without trailing slashes
app.use(require('./lib/web/middleware/redirectWithoutTrailingSlashes'))
// routes need sessions
// template files
app.set('views', path.join(__dirname, '/public/views'))
// set render engine
app.engine('ejs', ejs.renderFile)
// set view engine
app.set('view engine', 'ejs')
app.use(require('./lib/web/baseRouter'))
app.use(require('./lib/web/statusRouter'))
app.use(require('./lib/web/auth'))
app.use(require('./lib/web/historyRouter'))
app.use(require('./lib/web/userRouter'))
app.use(require('./lib/web/imageRouter'))
app.use(require('./lib/web/noteRouter'))
// response not found if no any route matxches
app.get('*', function (req, res) {
response.errorNotFound(res)
})
// socket.io secure
io.use(realtime.secure)
// socket.io auth
io.use(passportSocketIo.authorize({
cookieParser: cookieParser,
key: config.sessionname,
secret: config.sessionsecret,
store: sessionStore,
success: realtime.onAuthorizeSuccess,
fail: realtime.onAuthorizeFail
}))
// socket.io heartbeat
io.set('heartbeat interval', config.heartbeatinterval)
io.set('heartbeat timeout', config.heartbeattimeout)
// socket.io connection
io.sockets.on('connection', realtime.connection)
// listen
function startListen () {
server.listen(config.port, function () {
var schema = config.usessl ? 'HTTPS' : 'HTTP'
logger.info('%s Server listening at port %d', schema, config.port)
realtime.maintenance = false
})
}
// sync db then start listen
models.sequelize.sync().then(function () {
// check if realtime is ready
if (realtime.isReady()) {
models.Revision.checkAllNotesRevision(function (err, notes) {
if (err) throw new Error(err)
if (!notes || notes.length <= 0) return startListen()
})
} else {
throw new Error('server still not ready after db synced')
}
})
// log uncaught exception
process.on('uncaughtException', function (err) {
logger.error('An uncaught exception has occured.')
logger.error(err)
logger.error('Process will exit now.')
process.exit(1)
})
// install exit handler
function handleTermSignals () {
logger.info('hackmd has been killed by signal, try to exit gracefully...')
realtime.maintenance = true
// disconnect all socket.io clients
Object.keys(io.sockets.sockets).forEach(function (key) {
var socket = io.sockets.sockets[key]
// notify client server going into maintenance status
socket.emit('maintenance')
setTimeout(function () {
socket.disconnect(true)
}, 0)
})
var checkCleanTimer = setInterval(function () {
if (realtime.isReady()) {
models.Revision.checkAllNotesRevision(function (err, notes) {
if (err) return logger.error(err)
if (!notes || notes.length <= 0) {
clearInterval(checkCleanTimer)
return process.exit(0)
}
})
}
}, 100)
}
process.on('SIGINT', handleTermSignals)
process.on('SIGTERM', handleTermSignals)
process.on('SIGQUIT', handleTermSignals)