From 56f47830758ff8e92abcfcc5f35d474ab12fe215 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 5 Oct 2022 15:37:15 +0200
Subject: Support two factor authentication in backend

---
 server/lib/auth/oauth.ts | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'server/lib/auth/oauth.ts')

diff --git a/server/lib/auth/oauth.ts b/server/lib/auth/oauth.ts
index fa1887315..b541142a5 100644
--- a/server/lib/auth/oauth.ts
+++ b/server/lib/auth/oauth.ts
@@ -11,8 +11,20 @@ import OAuth2Server, {
 import { randomBytesPromise } from '@server/helpers/core-utils'
 import { MOAuthClient } from '@server/types/models'
 import { sha1 } from '@shared/extra-utils'
-import { OAUTH_LIFETIME } from '../../initializers/constants'
+import { HttpStatusCode } from '@shared/models'
+import { OAUTH_LIFETIME, OTP } from '../../initializers/constants'
 import { BypassLogin, getClient, getRefreshToken, getUser, revokeToken, saveToken } from './oauth-model'
+import { isOTPValid } from '@server/helpers/otp'
+
+class MissingTwoFactorError extends Error {
+  code = HttpStatusCode.UNAUTHORIZED_401
+  name = 'missing_two_factor'
+}
+
+class InvalidTwoFactorError extends Error {
+  code = HttpStatusCode.BAD_REQUEST_400
+  name = 'invalid_two_factor'
+}
 
 /**
  *
@@ -94,6 +106,9 @@ function handleOAuthAuthenticate (
 }
 
 export {
+  MissingTwoFactorError,
+  InvalidTwoFactorError,
+
   handleOAuthToken,
   handleOAuthAuthenticate
 }
@@ -118,6 +133,16 @@ async function handlePasswordGrant (options: {
   const user = await getUser(request.body.username, request.body.password, bypassLogin)
   if (!user) throw new InvalidGrantError('Invalid grant: user credentials are invalid')
 
+  if (user.otpSecret) {
+    if (!request.headers[OTP.HEADER_NAME]) {
+      throw new MissingTwoFactorError('Missing two factor header')
+    }
+
+    if (isOTPValid({ secret: user.otpSecret, token: request.headers[OTP.HEADER_NAME] }) !== true) {
+      throw new InvalidTwoFactorError('Invalid two factor header')
+    }
+  }
+
   const token = await buildToken()
 
   return saveToken(token, client, user, { bypassLogin })
-- 
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