add rotating keys

package.json

@@ -10,6 +10,8 @@
     "typescript": "^5.0.0"
   },
   "dependencies": {
-    "express-fingerprint": "^1.2.2"
+    "crypto": "^1.0.1",
+    "express-fingerprint": "^1.2.2",
+    "node-fetch": "^3.3.2"
   }
 }

packages/server/src/middlewares/DoorAuthModes.ts

@@ -1,8 +1,11 @@
 import { Request, RequestHandler } from "express";
 import { getRedisClient } from "../clients/db/RedisDbProvider";
-import { getAuthModes, getDoorSettingString } from "../util/EnvConfigUtil";
+import { getAllDoorNames, getAuthModes, getDoorSettingString } from "../util/EnvConfigUtil";
 import { IAuthMode } from "../types/IAuthMode";
 import { IDoorConfig } from "../types/IDoorConfig";
+import { doorRotatingKey } from "../types/RedisKeys";
+import crypto from "crypto";
+import fetch from "node-fetch";
 
 const client = await getRedisClient();
 
@@ -14,12 +17,15 @@ export const HandleAuthMode: RequestHandler = async (req, res, next) => {
     return;
   }
 
-  const isAuthorized = authModes.some((mode) => {
+  const checkAuth = async (mode: IAuthMode): Promise<boolean> => {
     switch(mode) {
       case IAuthMode.FIXED_PIN: return handleFixedPinAuth(req)
+      case IAuthMode.RANDOM_ROTATING_KEY: return await handleRandomRotatingKeyAuth(req)
       default: return false;
     }
-  });
+  }
+
+  const isAuthorized = (await Promise.all(authModes.map((mode) => checkAuth(mode)))).some(b => b);
 
   if (!isAuthorized) {
     res.status(401).json({ msg: 'Unauthorized' });
@@ -33,3 +39,27 @@ const handleFixedPinAuth = (req: Request): boolean => {
   const fixedPin = getDoorSettingString(req.params.id, IDoorConfig.FIXED_PIN);
   return fixedPin !== undefined && req.query['key'] === fixedPin;
 }
+
+const handleRandomRotatingKeyAuth = async (req: Request): Promise<boolean> => {
+  const currentPin = await client.get(doorRotatingKey(req.params.id));
+
+  if (currentPin === req.query['rotatingKey']) {
+    await replaceDoorRandomKey(req.params.id);
+    return true;
+  }
+  return false;
+}
+
+export const initializeRandomDoorPins = () => {
+  const doors = getAllDoorNames();
+  doors.forEach(replaceDoorRandomKey);
+}
+
+export const replaceDoorRandomKey = async (door: string) => {
+  const newKey = crypto.randomBytes(20).toString('hex');
+
+  await client.put(doorRotatingKey(door), newKey);
+
+  const message = `New key for door ${door}! Unlock link: ${Bun.env.BASE_DOMAIN}/api/door/${door}/auth?rotatingKey=${newKey}`;
+  await fetch(Bun.env.ROTATING_KEY_NTFY, { method: "POST", body: message });
+}

packages/server/src/server.ts

@@ -1,7 +1,11 @@
 import express from "express";
 import DoorRouter from "./routers/DoorRouter";
+import { getAllDoorNames } from "./util/EnvConfigUtil";
+import { getRedisClient } from "./clients/db/RedisDbProvider";
+import { initializeRandomDoorPins } from "./middlewares/DoorAuthModes";
 
 const Fingerprint = require('express-fingerprint');
+const client = getRedisClient();
 
 const app = express();
 
@@ -25,4 +29,5 @@ app.use('/api/door', DoorRouter);
 
 app.listen(5000, async () => {
   console.log("listening on port 5000");
+  initializeRandomDoorPins();
 });

packages/server/src/types/Environment.ts

@@ -5,5 +5,6 @@ declare module "bun" {
     REDIS_CONNECT_URL: string; // `redis[s]://[[username][:password]@][host][:port][/db-number]`
     DOOR_OPEN_TIMEOUT: number;
     DOOR_FIXED_PIN: string;
+    ROTATING_KEY_NTFY: string;
   }
 }

packages/server/src/types/IAuthMode.ts

@@ -1,3 +1,4 @@
 export enum IAuthMode {
   FIXED_PIN = "FIXED_PIN",
+  RANDOM_ROTATING_KEY = "RANDOM_ROTATING_KEY",
 }

packages/server/src/types/RedisKeys.ts

@@ -7,6 +7,10 @@ export function doorStatusKey(id: string) {
   return concatKeys(RedisKeys.DOORS, id, 'open');
 }
 
+export function doorRotatingKey(id: string) {
+  return concatKeys(RedisKeys.DOORS, id, 'rotatingKey');
+}
+
 export function concatKeys(...keys: String[]) {
   return keys.join(':');
 }

packages/server/src/util/EnvConfigUtil.ts

@@ -37,3 +37,15 @@ export const getDoorSettingTimeLock = (door: string): number[] => {
   // never locked (always -1 < hr < 25)
   return [25, -1];  
 }
+
+export const getAllDoorNames = (): string[] => {
+  const names: string[] = [];
+
+  Object.keys(Bun.env).forEach(key => {
+    if (key.startsWith(IDoorConfig.AUTH_MODES)) {
+      names.push(key.replace(IDoorConfig.AUTH_MODES + "_", "").toLowerCase());
+    }
+  });
+
+  return names;
+}