🛡️ feat: Model Validation Middleware (#1841)

* refactor: add ViolationTypes enum and add new violation for illegal model requests

* feat: validateModel middleware to protect the backend against illicit requests for unlisted models

.env.example

@@ -238,6 +238,8 @@ LIMIT_MESSAGE_USER=false
 MESSAGE_USER_MAX=40
 MESSAGE_USER_WINDOW=1
 
+ILLEGAL_MODEL_REQ_SCORE=5
+
 #========================#
 # Balance                #
 #========================#

api/cache/getLogStores.js

@@ -1,5 +1,5 @@
 const Keyv = require('keyv');
-const { CacheKeys } = require('librechat-data-provider');
+const { CacheKeys, ViolationTypes } = require('librechat-data-provider');
 const { logFile, violationFile } = require('./keyvFiles');
 const { math, isEnabled } = require('~/server/utils');
 const keyvRedis = require('./keyvRedis');
@@ -49,7 +49,10 @@ const namespaces = {
   message_limit: createViolationInstance('message_limit'),
   token_balance: createViolationInstance('token_balance'),
   registrations: createViolationInstance('registrations'),
-  [CacheKeys.FILE_UPLOAD_LIMIT]: createViolationInstance(CacheKeys.FILE_UPLOAD_LIMIT),
+  [ViolationTypes.FILE_UPLOAD_LIMIT]: createViolationInstance(ViolationTypes.FILE_UPLOAD_LIMIT),
+  [ViolationTypes.ILLEGAL_MODEL_REQUEST]: createViolationInstance(
+    ViolationTypes.ILLEGAL_MODEL_REQUEST,
+  ),
   logins: createViolationInstance('logins'),
   [CacheKeys.ABORT_KEYS]: abortKeys,
   [CacheKeys.TOKEN_CONFIG]: tokenConfig,

api/server/middleware/index.js

@@ -3,6 +3,7 @@ const checkBan = require('./checkBan');
 const uaParser = require('./uaParser');
 const setHeaders = require('./setHeaders');
 const loginLimiter = require('./loginLimiter');
+const validateModel = require('./validateModel');
 const requireJwtAuth = require('./requireJwtAuth');
 const uploadLimiters = require('./uploadLimiters');
 const registerLimiter = require('./registerLimiter');
@@ -32,6 +33,7 @@ module.exports = {
   validateMessageReq,
   buildEndpointOption,
   validateRegistration,
+  validateModel,
   moderateText,
   noIndex,
 };

api/server/middleware/uploadLimiters.js

@@ -1,5 +1,5 @@
 const rateLimit = require('express-rate-limit');
-const { CacheKeys } = require('librechat-data-provider');
+const { ViolationTypes } = require('librechat-data-provider');
 const logViolation = require('~/cache/logViolation');
 
 const getEnvironmentVariables = () => {
@@ -35,7 +35,7 @@ const createFileUploadHandler = (ip = true) => {
   } = getEnvironmentVariables();
 
   return async (req, res) => {
-    const type = CacheKeys.FILE_UPLOAD_LIMIT;
+    const type = ViolationTypes.FILE_UPLOAD_LIMIT;
     const errorMessage = {
       type,
       max: ip ? fileUploadIpMax : fileUploadUserMax,

api/server/middleware/validateModel.js

@@ -0,0 +1,50 @@
+const { EModelEndpoint, CacheKeys, ViolationTypes } = require('librechat-data-provider');
+const { logViolation, getLogStores } = require('~/cache');
+const { handleError } = require('~/server/utils');
+
+/**
+ * Validates the model of the request.
+ *
+ * @async
+ * @param {Express.Request} req - The Express request object.
+ * @param {Express.Response} res - The Express response object.
+ * @param {Function} next - The Express next function.
+ */
+const validateModel = async (req, res, next) => {
+  const { model, endpoint } = req.body;
+  if (!model) {
+    return handleError(res, { text: 'Model not provided' });
+  }
+
+  const cache = getLogStores(CacheKeys.CONFIG_STORE);
+  const modelsConfig = await cache.get(CacheKeys.MODELS_CONFIG);
+  if (!modelsConfig) {
+    return handleError(res, { text: 'Models not loaded' });
+  }
+
+  const availableModels = modelsConfig[endpoint];
+  if (!availableModels) {
+    return handleError(res, { text: 'Endpoint models not loaded' });
+  }
+
+  let validModel = !!availableModels.find((availableModel) => availableModel === model);
+  if (endpoint === EModelEndpoint.gptPlugins) {
+    validModel = validModel && availableModels.includes(req.body.agentOptions?.model);
+  }
+
+  if (validModel) {
+    return next();
+  }
+
+  const { ILLEGAL_MODEL_REQ_SCORE: score = 5 } = process.env ?? {};
+
+  const type = ViolationTypes.ILLEGAL_MODEL_REQUEST;
+  const errorMessage = {
+    type,
+  };
+
+  await logViolation(req, res, type, errorMessage, score);
+  return handleError(res, { text: 'Illegal model request' });
+};
+
+module.exports = validateModel;

api/server/routes/ask/anthropic.js

@@ -4,6 +4,7 @@ const { initializeClient } = require('~/server/services/Endpoints/anthropic');
 const {
   setHeaders,
   handleAbort,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -12,8 +13,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await AskController(req, res, next, initializeClient);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/ask/custom.js

@@ -5,6 +5,7 @@ const { addTitle } = require('~/server/services/Endpoints/openAI');
 const {
   handleAbort,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -13,8 +14,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await AskController(req, res, next, initializeClient, addTitle);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/ask/google.js

@@ -4,6 +4,7 @@ const { initializeClient } = require('~/server/services/Endpoints/google');
 const {
   setHeaders,
   handleAbort,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -12,8 +13,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await AskController(req, res, next, initializeClient);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/ask/gptPlugins.js

@@ -11,6 +11,7 @@ const {
   createAbortController,
   handleAbortError,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
   moderateText,
@@ -20,7 +21,13 @@ const { logger } = require('~/config');
 router.use(moderateText);
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res) => {
     let {
       text,
       endpointOption,
@@ -36,7 +43,10 @@ router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req,
     let responseMessageId;
     let lastSavedTimestamp = 0;
     let saveDelay = 100;
-  const sender = getResponseSender({ ...endpointOption, model: endpointOption.modelOptions.model });
+    const sender = getResponseSender({
+      ...endpointOption,
+      model: endpointOption.modelOptions.model,
+    });
     const newConvo = !conversationId;
     const user = req.user.id;
 
@@ -221,6 +231,7 @@ router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req,
         parentMessageId: userMessageId ?? parentMessageId,
       });
     }
-});
+  },
+);
 
 module.exports = router;

api/server/routes/ask/openAI.js

@@ -4,6 +4,7 @@ const { addTitle, initializeClient } = require('~/server/services/Endpoints/open
 const {
   handleAbort,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
   moderateText,
@@ -13,8 +14,15 @@ const router = express.Router();
 router.use(moderateText);
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await AskController(req, res, next, initializeClient, addTitle);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/assistants/chat.js

@@ -21,6 +21,7 @@ const router = express.Router();
 const {
   setHeaders,
   handleAbort,
+  validateModel,
   handleAbortError,
   // validateEndpoint,
   buildEndpointOption,
@@ -36,7 +37,7 @@ router.post('/abort', handleAbort());
  * @param {express.Response} res - The response object, used to send back a response.
  * @returns {void}
  */
-router.post('/', buildEndpointOption, setHeaders, async (req, res) => {
+router.post('/', validateModel, buildEndpointOption, setHeaders, async (req, res) => {
   logger.debug('[/assistants/chat/] req.body', req.body);
   const {
     text,

api/server/routes/edit/anthropic.js

@@ -4,6 +4,7 @@ const { initializeClient } = require('~/server/services/Endpoints/anthropic');
 const {
   setHeaders,
   handleAbort,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -12,8 +13,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await EditController(req, res, next, initializeClient);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/edit/custom.js

@@ -5,6 +5,7 @@ const { addTitle } = require('~/server/services/Endpoints/openAI');
 const {
   handleAbort,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -13,8 +14,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await EditController(req, res, next, initializeClient, addTitle);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/edit/google.js

@@ -4,6 +4,7 @@ const { initializeClient } = require('~/server/services/Endpoints/google');
 const {
   setHeaders,
   handleAbort,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
 } = require('~/server/middleware');
@@ -12,8 +13,15 @@ const router = express.Router();
 
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await EditController(req, res, next, initializeClient);
-});
+  },
+);
 
 module.exports = router;

api/server/routes/edit/gptPlugins.js

@@ -10,6 +10,7 @@ const {
   createAbortController,
   handleAbortError,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
   moderateText,
@@ -19,7 +20,13 @@ const { logger } = require('~/config');
 router.use(moderateText);
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res) => {
     let {
       text,
       generation,
@@ -43,7 +50,10 @@ router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req,
     let promptTokens;
     let lastSavedTimestamp = 0;
     let saveDelay = 100;
-  const sender = getResponseSender({ ...endpointOption, model: endpointOption.modelOptions.model });
+    const sender = getResponseSender({
+      ...endpointOption,
+      model: endpointOption.modelOptions.model,
+    });
     const userMessageId = parentMessageId;
     const user = req.user.id;
 
@@ -192,6 +202,7 @@ router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req,
         parentMessageId: userMessageId ?? parentMessageId,
       });
     }
-});
+  },
+);
 
 module.exports = router;

api/server/routes/edit/openAI.js

@@ -4,6 +4,7 @@ const { initializeClient } = require('~/server/services/Endpoints/openAI');
 const {
   handleAbort,
   setHeaders,
+  validateModel,
   validateEndpoint,
   buildEndpointOption,
   moderateText,
@@ -13,8 +14,15 @@ const router = express.Router();
 router.use(moderateText);
 router.post('/abort', handleAbort());
 
-router.post('/', validateEndpoint, buildEndpointOption, setHeaders, async (req, res, next) => {
+router.post(
+  '/',
+  validateEndpoint,
+  validateModel,
+  buildEndpointOption,
+  setHeaders,
+  async (req, res, next) => {
     await EditController(req, res, next, initializeClient);
-});
+  },
+);
 
 module.exports = router;

docs/features/mod_system.md

@@ -69,8 +69,13 @@ MESSAGE_IP_WINDOW=1 # in minutes, determines the window of time for MESSAGE_IP_M
 LIMIT_MESSAGE_USER=false # Whether to limit the amount of messages an IP can send per MESSAGE_USER_WINDOW
 MESSAGE_USER_MAX=40 # The max amount of messages an IP can send per MESSAGE_USER_WINDOW
 MESSAGE_USER_WINDOW=1 # in minutes, determines the window of time for MESSAGE_USER_MAX messages
+
+ILLEGAL_MODEL_REQ_SCORE=5 #Violation score to accrue if a user attempts to use an unlisted model.
+
 ```
 
+> Note: Illegal model requests are almost always nefarious as it means a 3rd party is attempting to access the server through an automated script. For this, I recommend a relatively high score, no less than 5.
+
 ## OpenAI moderation text
 
 ### OPENAI_MODERATION

docs/install/configuration/dotenv.md

@@ -602,8 +602,11 @@ REGISTRATION_VIOLATION_SCORE=1
 CONCURRENT_VIOLATION_SCORE=1
 MESSAGE_VIOLATION_SCORE=1
 NON_BROWSER_VIOLATION_SCORE=20
+ILLEGAL_MODEL_REQ_SCORE=5
 ```
 
+> Note: Non-browser access and Illegal model requests are almost always nefarious as it means a 3rd party is attempting to access the server through an automated script.
+
 #### Login and registration rate limiting.
 - `LOGIN_MAX`: The max amount of logins allowed per IP per `LOGIN_WINDOW`
 - `LOGIN_WINDOW`: In minutes, determines the window of time for `LOGIN_MAX` logins

packages/data-provider/src/config.ts

@@ -284,10 +284,20 @@ export enum CacheKeys {
    * Key for the override config cache.
    */
   OVERRIDE_CONFIG = 'overrideConfig',
+}
+
 /**
-   * Key for accessing File Upload Violations (exceeding limit).
+ * Enum for violation types, used to identify, log, and cache violations.
+ */
+export enum ViolationTypes {
+  /**
+   * File Upload Violations (exceeding limit).
    */
   FILE_UPLOAD_LIMIT = 'file_upload_limit',
+  /**
+   * Illegal Model Request (not available).
+   */
+  ILLEGAL_MODEL_REQUEST = 'illegal_model_request',
 }
 
 /**