server/lib/auth/oauth.ts

   1 import express from 'express'
   2 import OAuth2Server, {
   3   InvalidClientError,
   4   InvalidGrantError,
   5   InvalidRequestError,
   6   Request,
   7   Response,
   8   UnauthorizedClientError,
   9   UnsupportedGrantTypeError
  10 } from '@node-oauth/oauth2-server'
  11 import { randomBytesPromise } from '@server/helpers/core-utils'
  12 import { isOTPValid } from '@server/helpers/otp'
  13 import { MOAuthClient } from '@server/types/models'
  14 import { sha1 } from '@shared/extra-utils'
  15 import { HttpStatusCode } from '@shared/models'
  16 import { OAUTH_LIFETIME, OTP } from '../../initializers/constants'
  17 import { BypassLogin, getClient, getRefreshToken, getUser, revokeToken, saveToken } from './oauth-model'
  18
  19 class MissingTwoFactorError extends Error {
  20   code = HttpStatusCode.UNAUTHORIZED_401
  21   name = 'missing_two_factor'
  22 }
  23
  24 class InvalidTwoFactorError extends Error {
  25   code = HttpStatusCode.BAD_REQUEST_400
  26   name = 'invalid_two_factor'
  27 }
  28
  29 /**
  30  *
  31  * Reimplement some functions of OAuth2Server to inject external auth methods
  32  *
  33  */
  34 const oAuthServer = new OAuth2Server({
  35   accessTokenLifetime: OAUTH_LIFETIME.ACCESS_TOKEN,
  36   refreshTokenLifetime: OAUTH_LIFETIME.REFRESH_TOKEN,
  37
  38   // See https://github.com/oauthjs/node-oauth2-server/wiki/Model-specification for the model specifications
  39   model: require('./oauth-model')
  40 })
  41
  42 // ---------------------------------------------------------------------------
  43
  44 async function handleOAuthToken (req: express.Request, options: { refreshTokenAuthName?: string, bypassLogin?: BypassLogin }) {
  45   const request = new Request(req)
  46   const { refreshTokenAuthName, bypassLogin } = options
  47
  48   if (request.method !== 'POST') {
  49     throw new InvalidRequestError('Invalid request: method must be POST')
  50   }
  51
  52   if (!request.is([ 'application/x-www-form-urlencoded' ])) {
  53     throw new InvalidRequestError('Invalid request: content must be application/x-www-form-urlencoded')
  54   }
  55
  56   const clientId = request.body.client_id
  57   const clientSecret = request.body.client_secret
  58
  59   if (!clientId || !clientSecret) {
  60     throw new InvalidClientError('Invalid client: cannot retrieve client credentials')
  61   }
  62
  63   const client = await getClient(clientId, clientSecret)
  64   if (!client) {
  65     throw new InvalidClientError('Invalid client: client is invalid')
  66   }
  67
  68   const grantType = request.body.grant_type
  69   if (!grantType) {
  70     throw new InvalidRequestError('Missing parameter: `grant_type`')
  71   }
  72
  73   if (![ 'password', 'refresh_token' ].includes(grantType)) {
  74     throw new UnsupportedGrantTypeError('Unsupported grant type: `grant_type` is invalid')
  75   }
  76
  77   if (!client.grants.includes(grantType)) {
  78     throw new UnauthorizedClientError('Unauthorized client: `grant_type` is invalid')
  79   }
  80
  81   if (grantType === 'password') {
  82     return handlePasswordGrant({
  83       request,
  84       client,
  85       bypassLogin
  86     })
  87   }
  88
  89   return handleRefreshGrant({
  90     request,
  91     client,
  92     refreshTokenAuthName
  93   })
  94 }
  95
  96 function handleOAuthAuthenticate (
  97   req: express.Request,
  98   res: express.Response
  99 ) {
 100   return oAuthServer.authenticate(new Request(req), new Response(res))
 101 }
 102
 103 export {
 104   MissingTwoFactorError,
 105   InvalidTwoFactorError,
 106
 107   handleOAuthToken,
 108   handleOAuthAuthenticate
 109 }
 110
 111 // ---------------------------------------------------------------------------
 112
 113 async function handlePasswordGrant (options: {
 114   request: Request
 115   client: MOAuthClient
 116   bypassLogin?: BypassLogin
 117 }) {
 118   const { request, client, bypassLogin } = options
 119
 120   if (!request.body.username) {
 121     throw new InvalidRequestError('Missing parameter: `username`')
 122   }
 123
 124   if (!bypassLogin && !request.body.password) {
 125     throw new InvalidRequestError('Missing parameter: `password`')
 126   }
 127
 128   const user = await getUser(request.body.username, request.body.password, bypassLogin)
 129   if (!user) throw new InvalidGrantError('Invalid grant: user credentials are invalid')
 130
 131   if (user.otpSecret) {
 132     if (!request.headers[OTP.HEADER_NAME]) {
 133       throw new MissingTwoFactorError('Missing two factor header')
 134     }
 135
 136     if (await isOTPValid({ encryptedSecret: user.otpSecret, token: request.headers[OTP.HEADER_NAME] }) !== true) {
 137       throw new InvalidTwoFactorError('Invalid two factor header')
 138     }
 139   }
 140
 141   const token = await buildToken()
 142
 143   return saveToken(token, client, user, { bypassLogin })
 144 }
 145
 146 async function handleRefreshGrant (options: {
 147   request: Request
 148   client: MOAuthClient
 149   refreshTokenAuthName: string
 150 }) {
 151   const { request, client, refreshTokenAuthName } = options
 152
 153   if (!request.body.refresh_token) {
 154     throw new InvalidRequestError('Missing parameter: `refresh_token`')
 155   }
 156
 157   const refreshToken = await getRefreshToken(request.body.refresh_token)
 158
 159   if (!refreshToken) {
 160     throw new InvalidGrantError('Invalid grant: refresh token is invalid')
 161   }
 162
 163   if (refreshToken.client.id !== client.id) {
 164     throw new InvalidGrantError('Invalid grant: refresh token is invalid')
 165   }
 166
 167   if (refreshToken.refreshTokenExpiresAt && refreshToken.refreshTokenExpiresAt < new Date()) {
 168     throw new InvalidGrantError('Invalid grant: refresh token has expired')
 169   }
 170
 171   await revokeToken({ refreshToken: refreshToken.refreshToken })
 172
 173   const token = await buildToken()
 174
 175   return saveToken(token, client, refreshToken.user, { refreshTokenAuthName })
 176 }
 177
 178 function generateRandomToken () {
 179   return randomBytesPromise(256)
 180     .then(buffer => sha1(buffer))
 181 }
 182
 183 function getTokenExpiresAt (type: 'access' | 'refresh') {
 184   const lifetime = type === 'access'
 185     ? OAUTH_LIFETIME.ACCESS_TOKEN
 186     : OAUTH_LIFETIME.REFRESH_TOKEN
 187
 188   return new Date(Date.now() + lifetime * 1000)
 189 }
 190
 191 async function buildToken () {
 192   const [ accessToken, refreshToken ] = await Promise.all([ generateRandomToken(), generateRandomToken() ])
 193
 194   return {
 195     accessToken,
 196     refreshToken,
 197     accessTokenExpiresAt: getTokenExpiresAt('access'),
 198     refreshTokenExpiresAt: getTokenExpiresAt('refresh')
 199   }
 200 }