Express middleware for basic authentication

Prerequisites

• express based webserver
• mysql (knex compatible) database (see @pubcore/knex-auth)

Features

• supports two type of users: SYSTEM and HUMAN
• will set an user object to express req object (if authentication succeeded)
• serves allways "401 Unauthorized" and cancel URI, if no credentials
• serves allways "401 Unautherized" and cancel URI, if user not found
• calls express "next", if username and password is ok
• redirect to "deactivated" page, if wrong password used too much within a time window (105ms)
• redirect to "deactivated" page, if last login of user is long time ago
• updates last login stamp, one time within defined time frame
• redirects to change password page (including a back-uri), on first request of new user
• redirects to change password page (including a back-uri), if password is expired
• support secondary password for SYSTEM users
• does set a flag to user object (oldPwUsed), if secondary password exists, but old password has been used
• optinal support of login by JsonWebToken cookie (Jwt), enabled if option "jwtKeyFile" is available

activity diagram

Configuration options (set on server startup)

	options = {
		publicCancelLoginUri:'/login/canceled',
		publicDeactivatedUri:'/login/deactivated',
		changePasswordUri:'/login/pwchange',
		maxTimeWithoutActivity: 1000 * 60 * 60 * 24 * 180,//[msec]
		maxLoginAttempts:10,
		maxLoginAttemptsTimeWindow:1000 * 3600 * 24,//[msec]
		minTimeBetweenUpdates:1000 * 3600,//[msec],
		jwtKeyFile:'/run/secret/jwt-key.txt' //optional
	},
	table = 'user',

Example

	const
		createLoginMiddleware = require('@pubcore/express-basic-auth').default,
		options = {
			changePasswordUri:'/login/pwchange',
			publicDeactivatedUri:'/login/deactivated',
			publicCancelLoginUri:'/login/canceled',
			maxTimeWithoutActivity: 1000 * 60 * 60 * 24 * 180,//[msec]
			maxLoginAttempts:10,
			maxLoginAttemptsTimeWindow:1000 * 3600 * 24,//[msec]
			minTimeBetweenUpdates:1000 * 3600,//[msec]
		},
		table = 'user',
		knex = new Knex({
			client: 'mysql', connection: {/* see knex*/}
		}),
		db = {knex, table}

	const login = createLoginMiddleware({db, options})
	var router = express.Router()
	router.all('/', login)