Merge pull request #18 from detleph/feature-user-auth

Add user authentication

docker-compose.yml

@@ -17,6 +17,9 @@ services:
       - POSTGRES_USER=server
       - POSTGRES_PASSWORD=${DATABASE_PASSWORD}
     container_name: "postgres"
+  redis:
+    image: redis
+    restart: always
   server:
     build: .
     restart: always

package.json

@@ -20,11 +20,16 @@
   "homepage": "https://github.com/detleph/server#readme",
   "dependencies": {
     "@prisma/client": "^3.3.0",
+    "@types/jsonwebtoken": "^8.5.5",
     "@types/node": "^16.10.3",
     "@types/nodemailer": "^6.4.4",
+    "@types/redis": "^2.8.32",
+    "argon2": "^0.28.2",
     "dotenv": "^10.0.0",
     "express": "^4.17.1",
-    "nodemailer": "^6.7.0"
+    "jsonwebtoken": "^8.5.1",
+    "nodemailer": "^6.7.0",
+    "redis": "^3.1.2"
   },
   "devDependencies": {
     "@types/chai": "^4.2.22",

prisma/schema.prisma

@@ -10,10 +10,11 @@ generator client {
 }
 
 model Event {
-  id   Int      @id @default(autoincrement()) // Primary key
-  pid  String   @unique @default(dbgenerated("gen_random_uuid()")) @db.Uuid // Public key
-  date DateTime
-  name String
+  id          Int      @id @default(autoincrement()) // Primary key
+  pid         String   @unique @default(dbgenerated("gen_random_uuid()")) @db.Uuid // Public key
+  date        DateTime
+  name        String
+  description String
 
   disciplines   Discipline[]
   admins        Admin[]
@@ -24,11 +25,12 @@ model Event {
 model Campaign {
   id        Int      @id @default(autoincrement())
   pid       String   @unique @default(dbgenerated("gen_random_uuid()")) @db.Uuid
+  start     DateTime
   expiresAt DateTime
 
-  event   Event        @relation(fields: [eventId], references: [id])
   links   Link[]
-  eventId Int          @unique
+  event   Event  @relation(fields: [eventId], references: [id])
+  eventId Int    @unique
 }
 
 model Link {
@@ -38,7 +40,7 @@ model Link {
 
   campaign   Campaign @relation(fields: [campaignId], references: [id])
   campaignId Int
-  group      Group    @relation(fields: [groupId], references: [id])
+  group      Group?   @relation(fields: [groupId], references: [id])
   groupId    Int      @unique
 }
 
@@ -48,6 +50,8 @@ model Admin {
   name             String
   password         String // TODO: Probably specify hash size (VarChar or some other type)
   permission_level AdminLevel @default(STANDARD)
+  revision         String
+  groups           Group[]
 
   event   Event @relation(fields: [eventId], references: [id])
   eventId Int
@@ -117,16 +121,17 @@ model Organisation {
 }
 
 model Group {
-  id          Int    @id @default(autoincrement())
-  pid         String @unique @default(dbgenerated("gen_random_uuid()")) @db.Uuid
-  name        String
-  user_limit  Int    @default(40)
-  level       Int
+  id         Int    @id @default(autoincrement())
+  pid        String @unique @default(dbgenerated("gen_random_uuid()")) @db.Uuid
+  name       String
+  user_limit Int    @default(40)
+  level      Int
 
   oragnisation   Organisation  @relation(fields: [oragnisationId], references: [id])
   oragnisationId Int
   participants   Participant[]
   link           Link?
+  admins         Admin[]
 }
 
 enum AdminLevel {
@@ -137,5 +142,5 @@ enum AdminLevel {
 enum Gender {
   MALE
   FEMALE
-  OTHERS
+  OTHER
 }

src/Controllers/admin_auth.controller.ts

@@ -0,0 +1,83 @@
+import { Request, Response } from "express";
+import { Admin, AdminLevel, Group } from "@prisma/client";
+import { authClient } from "../lib/redis";
+import prisma from "../lib/prisma";
+import argon2 from "argon2";
+import jwt from "jsonwebtoken";
+
+const JWT_SECRET = process.env.JWT_SECRET || "secret";
+const TOKEN_EXPIRY = "4 days";
+
+export interface AuthJWTPayload {
+  pid: string;
+  name: string;
+  permission_level: AdminLevel;
+  revision: string;
+  groups: string[];
+}
+
+function createAdminJWT(admin: Admin & { groups: Group[] }) {
+  const payload: AuthJWTPayload = {
+    pid: admin.pid,
+    name: admin.name,
+    permission_level: admin.permission_level,
+    revision: admin.revision,
+    groups: admin.groups.map((group) => group.pid),
+  };
+
+  return jwt.sign(payload, JWT_SECRET, { expiresIn: TOKEN_EXPIRY });
+}
+
+interface AuthenticateUserBody {
+  name?: string;
+  password?: string;
+}
+
+export const authenticateUser = async (req: Request<{}, {}, AuthenticateUserBody>, res: Response) => {
+  // TODO: Provide more useful error messages (Maybe express-validator?)
+
+  const { name, password } = req.body || {};
+
+  if (name == null || password == null) {
+    return res.status(400).json({
+      type: "error",
+      payload: {
+        message: "The body must contain 'name' and 'password' attributes of type string",
+      },
+    });
+  }
+
+  const user = await prisma.admin.findFirst({ where: { name }, include: { groups: true } });
+
+  // REVIEW: It is possible to initiate a timing attack here (To see which users exist)
+  //         This should, however, not be of too much concern, as one can basically do nothing
+  //         with only the username
+
+  if (!user) {
+    return res.status(404).json({
+      type: "error",
+      payload: {
+        message: `The provided credentials are not valid`,
+      },
+    });
+  }
+
+  if (await argon2.verify(user.password, password, { type: argon2.argon2id })) {
+    // Set password revision ID in redis
+    await authClient.set(user.pid, user.revision);
+
+    return res.status(200).json({
+      type: "success",
+      payload: {
+        token: createAdminJWT(user),
+      },
+    });
+  }
+
+  return res.status(403).json({
+    type: "error",
+    payload: {
+      message: "The provided credentials are not valid",
+    },
+  });
+};

src/Controllers/event.controller.ts

@@ -5,6 +5,7 @@ const getAllEvents = async (req: Request, res: Response) => {
   const events = await prisma.event.findMany({
     select: {
       name: true,
+      description: true,
       date: true,
       pid: true,
       id: false,
@@ -26,6 +27,7 @@ const addEvent = async (req: Request, res: Response) => {
     data: {
       name: req.body.name,
       date: req.body.date,
+      description: req.body.description,
     },
     select: {
       name: true,

src/Middleware/auth/auth.ts

@@ -0,0 +1,90 @@
+/// <reference path="../../custom.d.ts" />
+
+import { NextFunction, Request, Response } from "express";
+import { AuthJWTPayload } from "../../Controllers/admin_auth.controller";
+import { authClient } from "../../lib/redis";
+import jwt, { JsonWebTokenError, JwtPayload } from "jsonwebtoken";
+import prisma from "../../lib/prisma";
+
+const JWT_SECRET = process.env.JWT_SECRET || "secret";
+
+const verifyAuthorizationFormat = (authorization: string) => /^Bearer .+$/.test(authorization);
+
+const getBearerToken = (authorization: string) => authorization.slice(7);
+
+export const requireAuthentication = async (req: Request, res: Response, next: NextFunction) => {
+  const { authorization } = req.headers;
+
+  if (!authorization) {
+    return res.status(403).send({
+      type: "error",
+      payload: {
+        message: "The requeset did not include the Authorization header",
+      },
+    });
+  }
+
+  if (!verifyAuthorizationFormat(authorization)) {
+    return res.status(400).send({
+      type: "error",
+      payload: {
+        message: "Malformed Authorization header",
+        format: "Bearer <token>",
+      },
+    });
+  }
+
+  let token_payload_: string | JwtPayload;
+
+  try {
+    token_payload_ = jwt.verify(getBearerToken(authorization), JWT_SECRET);
+  } catch (e) {
+    if (e instanceof JsonWebTokenError) {
+      return res.status(403).json({
+        type: "error",
+        payload: {
+          message: "Token could not be verified; It might be expired",
+        },
+      });
+    }
+
+    throw e;
+  }
+
+  const token_payload = token_payload_ as AuthJWTPayload;
+
+  const { pid, revision } = token_payload;
+
+  let db_revision = await authClient.get(pid);
+
+  if (db_revision === null) {
+    // Load the revision ID from the main DB and cache it in redis
+    const user = await prisma.admin.findUnique({ where: { pid }, select: { revision: true } });
+
+    if (user) {
+      db_revision = user.revision;
+
+      await authClient.set(pid, db_revision);
+    }
+  }
+
+  if (revision !== db_revision || !revision || !db_revision) {
+    return res.status(403).json({
+      type: "error",
+      payload: {
+        message: "Token could not be verified; It might be expired",
+      },
+    });
+  }
+
+  req.auth = {
+    isAuthenticated: true,
+    pid: token_payload.pid,
+    name: token_payload.name,
+    permission_level: token_payload.permission_level,
+    groups: token_payload.groups,
+    revision: token_payload.revision,
+  };
+
+  next();
+};

src/custom.d.ts

@@ -0,0 +1,7 @@
+import { AuthJWTPayload } from "./Controllers/admin_auth.controller";
+
+declare module "express-serve-static-core" {
+  interface Request {
+    auth?: AuthJWTPayload & { isAuthenticated: boolean };
+  }
+}

src/lib/redis.ts

@@ -0,0 +1,27 @@
+import redis from "redis";
+import { promisify } from "util";
+
+const REDIS_INDICES = {
+  auth: 0,
+};
+
+const REDIS_HOST = process.env.REDIS_HOST || "redis";
+const REDIS_PORT = process.env.REDIS_PORT ? parseInt(process.env.REDIS_PORT) : 6379;
+
+// TODO: Extend
+function createAsyncClient(client: redis.RedisClient) {
+  return {
+    get: promisify(client.get).bind(client),
+    set: promisify(client.set).bind(client),
+  };
+}
+
+// ----------------- //
+// Redis auth client //
+// ----------------- //
+
+const auth = redis.createClient({ host: REDIS_HOST, port: REDIS_PORT });
+
+auth.select(REDIS_INDICES.auth);
+
+export const authClient = createAsyncClient(auth);