Begin support for external auths

1 files changed, 159 insertions, 66 deletions

diff --git a/server/lib/auth.ts b/server/lib/auth.ts
index 5a6dd9dec..eaae5fdf3 100644
--- a/server/lib/auth.ts
+++ b/server/lib/auth.ts
@@ -1,13 +1,18 @@
-import * as express from 'express'
-import { OAUTH_LIFETIME } from '@server/initializers/constants'
-import * as OAuthServer from 'express-oauth-server'
-import { PluginManager } from '@server/lib/plugins/plugin-manager'
-import { RegisterServerAuthPassOptions } from '@shared/models/plugins/register-server-auth.model'
+import { isUserDisplayNameValid, isUserRoleValid, isUserUsernameValid } from '@server/helpers/custom-validators/users'
 import { logger } from '@server/helpers/logger'
-import { UserRole } from '@shared/models'
+import { generateRandomString } from '@server/helpers/utils'
+import { OAUTH_LIFETIME, WEBSERVER } from '@server/initializers/constants'
 import { revokeToken } from '@server/lib/oauth-model'
+import { PluginManager } from '@server/lib/plugins/plugin-manager'
 import { OAuthTokenModel } from '@server/models/oauth/oauth-token'
-import { isUserUsernameValid, isUserRoleValid, isUserDisplayNameValid } from '@server/helpers/custom-validators/users'
+import { UserRole } from '@shared/models'
+import {
+  RegisterServerAuthenticatedResult,
+  RegisterServerAuthPassOptions,
+  RegisterServerExternalAuthenticatedResult
+} from '@shared/models/plugins/register-server-auth.model'
+import * as express from 'express'
+import * as OAuthServer from 'express-oauth-server'
 
 const oAuthServer = new OAuthServer({
   useErrorHandler: true,
@@ -17,15 +22,28 @@ const oAuthServer = new OAuthServer({
   model: require('./oauth-model')
 })
 
-function onExternalAuthPlugin (npmName: string, username: string, email: string) {
-
-}
+// Token is the key, expiration date is the value
+const authBypassTokens = new Map<string, {
+  expires: Date
+  user: {
+    username: string
+    email: string
+    displayName: string
+    role: UserRole
+  }
+  authName: string
+  npmName: string
+}>()
 
 async function handleIdAndPassLogin (req: express.Request, res: express.Response, next: express.NextFunction) {
   const grantType = req.body.grant_type
 
-  if (grantType === 'password') await proxifyPasswordGrant(req, res)
-  else if (grantType === 'refresh_token') await proxifyRefreshGrant(req, res)
+  if (grantType === 'password') {
+    if (req.body.externalAuthToken) proxifyExternalAuthBypass(req, res)
+    else await proxifyPasswordGrant(req, res)
+  } else if (grantType === 'refresh_token') {
+    await proxifyRefreshGrant(req, res)
+  }
 
   return forwardTokenReq(req, res, next)
 }
@@ -53,31 +71,60 @@ async function handleTokenRevocation (req: express.Request, res: express.Respons
   return res.sendStatus(200)
 }
 
-// ---------------------------------------------------------------------------
+async function onExternalUserAuthenticated (options: {
+  npmName: string
+  authName: string
+  authResult: RegisterServerExternalAuthenticatedResult
+}) {
+  const { npmName, authName, authResult } = options
 
-export {
-  oAuthServer,
-  handleIdAndPassLogin,
-  onExternalAuthPlugin,
-  handleTokenRevocation
+  if (!authResult.req || !authResult.res) {
+    logger.error('Cannot authenticate external user for auth %s of plugin %s: no req or res are provided.', authName, npmName)
+    return
+  }
+
+  if (!isAuthResultValid(npmName, authName, authResult)) return
+
+  const { res } = authResult
+
+  logger.info('Generating auth bypass token for %s in auth %s of plugin %s.', authResult.username, authName, npmName)
+
+  const bypassToken = await generateRandomString(32)
+  const tokenLifetime = 1000 * 60 * 5 // 5 minutes
+
+  const expires = new Date()
+  expires.setTime(expires.getTime() + tokenLifetime)
+
+  const user = buildUserResult(authResult)
+  authBypassTokens.set(bypassToken, {
+    expires,
+    user,
+    npmName,
+    authName
+  })
+
+  res.redirect(`/login?externalAuthToken=${bypassToken}&username=${user.username}`)
 }
 
 // ---------------------------------------------------------------------------
 
-function forwardTokenReq (req: express.Request, res: express.Response, next: express.NextFunction) {
+export { oAuthServer, handleIdAndPassLogin, onExternalUserAuthenticated, handleTokenRevocation }
+
+// ---------------------------------------------------------------------------
+
+function forwardTokenReq (req: express.Request, res: express.Response, next?: express.NextFunction) {
   return oAuthServer.token()(req, res, err => {
     if (err) {
       logger.warn('Login error.', { err })
 
       return res.status(err.status)
-                .json({
-                  error: err.message,
-                  code: err.name
-                })
-                .end()
+        .json({
+          error: err.message,
+          code: err.name
+        })
     }
 
-    return next()
+    if (next) return next()
   })
 }
 
@@ -131,50 +178,96 @@ async function proxifyPasswordGrant (req: express.Request, res: express.Response
 
     try {
       const loginResult = await authOptions.login(loginOptions)
-      if (loginResult) {
-        logger.info(
-          'Login success with auth method %s of plugin %s for %s.',
-          authName, npmName, loginOptions.id
-        )
-
-        if (!isUserUsernameValid(loginResult.username)) {
-          logger.error('Auth method %s of plugin %s did not provide a valid username.', authName, npmName, { loginResult })
-          continue
-        }
-
-        if (!loginResult.email) {
-          logger.error('Auth method %s of plugin %s did not provide a valid email.', authName, npmName, { loginResult })
-          continue
-        }
-
-        // role is optional
-        if (loginResult.role && !isUserRoleValid(loginResult.role)) {
-          logger.error('Auth method %s of plugin %s did not provide a valid role.', authName, npmName, { loginResult })
-          continue
-        }
-
-        // display name is optional
-        if (loginResult.displayName && !isUserDisplayNameValid(loginResult.displayName)) {
-          logger.error('Auth method %s of plugin %s did not provide a valid display name.', authName, npmName, { loginResult })
-          continue
-        }
-
-        res.locals.bypassLogin = {
-          bypass: true,
-          pluginName: pluginAuth.npmName,
-          authName: authOptions.authName,
-          user: {
-            username: loginResult.username,
-            email: loginResult.email,
-            role: loginResult.role || UserRole.USER,
-            displayName: loginResult.displayName || loginResult.username
-          }
-        }
-
-        return
+
+      if (!loginResult) continue
+      if (!isAuthResultValid(pluginAuth.npmName, authOptions.authName, loginResult)) continue
+
+      logger.info(
+        'Login success with auth method %s of plugin %s for %s.',
+        authName, npmName, loginOptions.id
+      )
+
+      res.locals.bypassLogin = {
+        bypass: true,
+        pluginName: pluginAuth.npmName,
+        authName: authOptions.authName,
+        user: buildUserResult(loginResult)
       }
+
+      return
     } catch (err) {
       logger.error('Error in auth method %s of plugin %s', authOptions.authName, pluginAuth.npmName, { err })
     }
   }
 }
+
+function proxifyExternalAuthBypass (req: express.Request, res: express.Response) {
+  const obj = authBypassTokens.get(req.body.externalAuthToken)
+  if (!obj) {
+    logger.error('Cannot authenticate user with unknown bypass token')
+    return res.sendStatus(400)
+  }
+
+  const { expires, user, authName, npmName } = obj
+
+  const now = new Date()
+  if (now.getTime() > expires.getTime()) {
+    logger.error('Cannot authenticate user with an expired bypass token')
+    return res.sendStatus(400)
+  }
+
+  if (user.username !== req.body.username) {
+    logger.error('Cannot authenticate user %s with invalid username %s.', req.body.username)
+    return res.sendStatus(400)
+  }
+
+  // Bypass oauth library validation
+  req.body.password = 'fake'
+
+  logger.info(
+    'Auth success with external auth method %s of plugin %s for %s.',
+    authName, npmName, user.email
+  )
+
+  res.locals.bypassLogin = {
+    bypass: true,
+    pluginName: npmName,
+    authName: authName,
+    user
+  }
+}
+
+function isAuthResultValid (npmName: string, authName: string, result: RegisterServerAuthenticatedResult) {
+  if (!isUserUsernameValid(result.username)) {
+    logger.error('Auth method %s of plugin %s did not provide a valid username.', authName, npmName, { result })
+    return false
+  }
+
+  if (!result.email) {
+    logger.error('Auth method %s of plugin %s did not provide a valid email.', authName, npmName, { result })
+    return false
+  }
+
+  // role is optional
+  if (result.role && !isUserRoleValid(result.role)) {
+    logger.error('Auth method %s of plugin %s did not provide a valid role.', authName, npmName, { result })
+    return false
+  }
+
+  // display name is optional
+  if (result.displayName && !isUserDisplayNameValid(result.displayName)) {
+    logger.error('Auth method %s of plugin %s did not provide a valid display name.', authName, npmName, { result })
+    return false
+  }
+
+  return true
+}
+
+function buildUserResult (pluginResult: RegisterServerAuthenticatedResult) {
+  return {
+    username: pluginResult.username,
+    email: pluginResult.email,
+    role: pluginResult.role || UserRole.USER,
+    displayName: pluginResult.displayName || pluginResult.username
+  }
+}