パスキーチュートリアル：Webアプリにパスキーを実装する方法

init-db.sql
CREATE TABLE users
(
    id       VARCHAR(255) PRIMARY KEY,
    username VARCHAR(255) NOT NULL UNIQUE
);
 
CREATE TABLE credentials
(
    id            INT AUTO_INCREMENT PRIMARY KEY,
    user_id       VARCHAR(255) NOT NULL,
    credential_id VARCHAR(255) NOT NULL,
    public_key    TEXT         NOT NULL,
    counter       INT          NOT NULL,
    transports    VARCHAR(255),
    FOREIGN KEY (user_id) REFERENCES users (id)
);

docker-compose.yml
version: "3.1"
 
services:
    db:
        image: mysql
        command: --default-authentication-plugin=mysql_native_password
        restart: always
        environment:
            MYSQL_ROOT_PASSWORD: my-secret-pw
            MYSQL_DATABASE: webauthn_db
        ports:
            - "3306:3306"
        volumes:
            - ./init-db.sql:/docker-entrypoint-initdb.d/init-db.sql

docker compose up -d

docker exec -it <container ID> mysql -uroot -p

use
webauthn_db;
show
tables;

npx create-express-typescript-application passkeys-tutorial

cd passkeys-tutorial
npm install @simplewebauthn/server mysql2 uuid express-session
@types/express-session @types/uuid

npm run dev:nodemon

database.ts
import mysql from "mysql2";
 
// Create a MySQL pool
const pool = mysql.createPool({
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME,
    waitForConnections: true,
    connectionLimit: 10,
    queueLimit: 0,
});
 
// Promisify for Node.js async/await.
export const promisePool = pool.promise();

config.json
{
    "PORT": 8080,
    "NODE_ENV": "development"
}

package.json
{
    "name": "passkeys-tutorial",
    "version": "0.0.1",
    "description": "passkeys-tutorial initialised with create-express-typescript-application.",
    "main": "src/index.ts",
    "scripts": {
        "build": "tsc",
        "start": "node ./build/src/index.js",
        "dev": "ts-node ./src/index.ts",
        "dev:nodemon": "nodemon -w src -e ts,json -x ts-node ./src/index.ts",
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "keywords": ["express", "typescript"],
    "devDependencies": {
        "@types/cors": "^2.8.17",
        "@types/express": "^4.17.21",
        "@types/morgan": "^1.9.9",
        "@types/node": "^14.18.63",
        "@typescript-eslint/eslint-plugin": "^4.33.0",
        "@typescript-eslint/parser": "^4.33.0",
        "eslint": "^7.32.0",
        "nodemon": "^2.0.22",
        "ts-node": "^10.8.1",
        "typescript": "^4.9.5"
    },
    "dependencies": {
        "@simplewebauthn/server": "^8.3.5",
        "@types/express-session": "^1.17.10",
        "@types/uuid": "^9.0.7",
        "cors": "^2.8.5",
        "env-cmd": "^10.1.0",
        "express": "^4.18.2",
        "express-session": "^1.17.3",
        "fs": "^0.0.1-security",
        "helmet": "^4.6.0",
        "morgan": "^1.10.0",
        "mysql2": "^3.6.5",
        "uuid": "^9.0.1"
    }
}

index.ts
import app from "./server";
import config from "../config.json";
 
// Start the application by listening to specific port
const port = Number(process.env.PORT || config.PORT || 8080);
app.listen(port, () => {
    console.info("Express application started on port: " + port);
});

server.ts
import express, { Express } from "express";
import morgan from "morgan";
import helmet from "helmet";
import cors from "cors";
import config from "../config.json";
import { router as passkeyRoutes } from "./routes/routes";
import session from "express-session";
 
const app: Express = express();
 
declare module "express-session" {
    interface SessionData {
        currentChallenge?: string;
        loggedInUserId?: string;
    }
}
 
/************************************************************************************
 *                              Basic Express Middlewares
 ***********************************************************************************/
app.set("json spaces", 4);
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
 
app.use(
    session({
        // @ts-ignore
        secret: process.env.SESSION_SECRET,
        saveUninitialized: true,
        resave: false,
        cookie: {
            maxAge: 86400000,
            httpOnly: true, // Ensure to not expose session cookies to clientside scripts
        },
    }),
);
 
// Handle logs in console during development
if (process.env.NODE_ENV === "development" || config.NODE_ENV === "development") {
    app.use(morgan("dev"));
    app.use(cors());
}
 
// Handle security and origin in production
if (process.env.NODE_ENV === "production" || config.NODE_ENV === "production") {
    app.use(helmet());
}
 
/************************************************************************************
 *                               Register all routes
 ***********************************************************************************/
app.use("/api/passkey", passkeyRoutes);
 
app.use(express.static("src/public"));
 
export default app;

userService.ts
import { promisePool } from "../database"; // Adjust the import path as necessary
import { v4 as uuidv4 } from "uuid";
 
export const userService = {
    async getUserById(userId: string) {
        const [rows] = await promisePool.query("SELECT * FROM users WHERE id = ?", [
            userId,
        ]);
        // @ts-ignore
        return rows[0];
    },
 
    async getUserByUsername(username: string) {
        try {
            const [rows] = await promisePool.query(
                "SELECT * FROM users WHERE username = ?",
                [username],
            );
            // @ts-ignore
            return rows[0];
        } catch (error) {
            return null;
        }
    },
 
    async createUser(username: string) {
        const id = uuidv4();
        await promisePool.query("INSERT INTO users (id, username) VALUES (?, ?)", [
            id,
            username,
        ]);
        return { id, username };
    },
};

credentialService.ts
import { promisePool } from "../database";
import type { AuthenticatorDevice } from "@simplewebauthn/typescript-types";
 
export const credentialService = {
    async saveNewCredential(
        userId: string,
        credentialId: string,
        publicKey: string,
        counter: number,
        transports: string,
    ) {
        try {
            await promisePool.query(
                "INSERT INTO credentials (user_id, credential_id, public_key, counter, transports) VALUES (?, ?, ?, ?, ?)",
                [userId, credentialId, publicKey, counter, transports],
            );
        } catch (error) {
            console.error("Error saving new credential:", error);
            throw error;
        }
    },
 
    async getCredentialByCredentialId(
        credentialId: string,
    ): Promise<AuthenticatorDevice | null> {
        try {
            const [rows] = await promisePool.query(
                "SELECT * FROM credentials WHERE credential_id = ? LIMIT 1",
                [credentialId],
            );
            // @ts-ignore
            if (rows.length === 0) return null;
            // @ts-ignore
            const row = rows[0];
            return {
                userID: row.user_id,
                credentialID: row.credential_id,
                credentialPublicKey: row.public_key,
                counter: row.counter,
                transports: row.transports ? row.transports.split(",") : [],
            } as AuthenticatorDevice;
        } catch (error) {
            console.error("Error retrieving credential:", error);
            throw error;
        }
    },
 
    async updateCredentialCounter(credentialId: string, newCounter: number) {
        try {
            await promisePool.query(
                "UPDATE credentials SET counter = ? WHERE credential_id = ?",
                [newCounter, credentialId],
            );
        } catch (error) {
            console.error("Error updating credential counter:", error);
            throw error;
        }
    },
};

errorHandler.ts
import { Request, Response, NextFunction } from "express";
import { CustomError } from "./customError";
 
interface ErrorWithStatus extends Error {
    statusCode?: number;
}
 
export const handleError = (
    err: CustomError,
    req: Request,
    res: Response,
    next: NextFunction,
) => {
    const statusCode = err.statusCode || 500;
    const message = err.message || "Internal Server Error";
    console.log(message);
    res.status(statusCode).send({ error: message });
};

customError.ts
export class CustomError extends Error {
    statusCode: number;
 
    constructor(message: string, statusCode: number = 500) {
        super(message);
        this.statusCode = statusCode;
        Object.setPrototypeOf(this, CustomError.prototype);
    }
}

constant.ts
export const rpName: string = "Passkeys Tutorial";
export const rpID: string = "localhost";
export const origin: string = `http://${rpID}:8080`;

utils.ts
export const uint8ArrayToBase64 = (uint8Array: Uint8Array): string =>
    Buffer.from(uint8Array).toString("base64");
 
export const base64ToUint8Array = (base64: string): Uint8Array =>
    new Uint8Array(Buffer.from(base64, "base64"));

registration.ts
import {
    generateRegistrationOptions,
    verifyRegistrationResponse,
} from "@simplewebauthn/server";
import { uint8ArrayToBase64 } from "../utils/utils";
import { rpName, rpID, origin } from "../utils/constants";
import { credentialService } from "../services/credentialService";
import { userService } from "../services/userService";
import { RegistrationResponseJSON } from "@simplewebauthn/typescript-types";
import { Request, Response, NextFunction } from "express";
import { CustomError } from "../middleware/customError";
 
export const handleRegisterStart = async (
    req: Request,
    res: Response,
    next: NextFunction,
) => {
    const { username } = req.body;
 
    if (!username) {
        return next(new CustomError("Username empty", 400));
    }
 
    try {
        let user = await userService.getUserByUsername(username);
        if (user) {
            return next(new CustomError("User already exists", 400));
        } else {
            user = await userService.createUser(username);
        }
 
        const options = await generateRegistrationOptions({
            rpName,
            rpID,
            userID: user.id,
            userName: user.username,
            timeout: 60000,
            attestationType: "direct",
            excludeCredentials: [],
            authenticatorSelection: {
                residentKey: "preferred",
            },
            // Support for the two most common algorithms: ES256, and RS256
            supportedAlgorithmIDs: [-7, -257],
        });
        req.session.loggedInUserId = user.id;
        req.session.currentChallenge = options.challenge;
        res.send(options);
    } catch (error) {
        next(
            error instanceof CustomError
                ? error
                : new CustomError("Internal Server Error", 500),
        );
    }
};
 
export const handleRegisterFinish = async (
    req: Request,
    res: Response,
    next: NextFunction,
) => {
    const { body } = req;
    const { currentChallenge, loggedInUserId } = req.session;
 
    if (!loggedInUserId) {
        return next(new CustomError("User ID is missing", 400));
    }
 
    if (!currentChallenge) {
        return next(new CustomError("Current challenge is missing", 400));
    }
 
    try {
        const verification = await verifyRegistrationResponse({
            response: body as RegistrationResponseJSON,
            expectedChallenge: currentChallenge,
            expectedOrigin: origin,
            expectedRPID: rpID,
            requireUserVerification: true,
        });
 
        if (verification.verified && verification.registrationInfo) {
            const { credentialPublicKey, credentialID, counter } =
                verification.registrationInfo;
            await credentialService.saveNewCredential(
                loggedInUserId,
                uint8ArrayToBase64(credentialID),
                uint8ArrayToBase64(credentialPublicKey),
                counter,
                body.response.transports,
            );
            res.send({ verified: true });
        } else {
            next(new CustomError("Verification failed", 400));
        }
    } catch (error) {
        next(
            error instanceof CustomError
                ? error
                : new CustomError("Internal Server Error", 500),
        );
    } finally {
        req.session.loggedInUserId = undefined;
        req.session.currentChallenge = undefined;
    }
};

authentication.ts
import { Request, Response, NextFunction } from "express";
import {
    generateAuthenticationOptions,
    verifyAuthenticationResponse,
} from "@simplewebauthn/server";
import { uint8ArrayToBase64, base64ToUint8Array } from "../utils/utils";
import { rpID, origin } from "../utils/constants";
import { credentialService } from "../services/credentialService";
import { userService } from "../services/userService";
import { AuthenticatorDevice } from "@simplewebauthn/typescript-types";
import { isoBase64URL } from "@simplewebauthn/server/helpers";
import {
    VerifiedAuthenticationResponse,
    VerifyAuthenticationResponseOpts,
} from "@simplewebauthn/server/esm";
import { CustomError } from "../middleware/customError";
 
export const handleLoginStart = async (
    req: Request,
    res: Response,
    next: NextFunction,
) => {
    const { username } = req.body;
    try {
        const user = await userService.getUserByUsername(username);
        if (!user) {
            return next(new CustomError("User not found", 404));
        }
 
        req.session.loggedInUserId = user.id;
 
        // allowCredentials is purposely for this demo left empty. This causes all existing local credentials
        // to be displayed for the service instead only the ones the username has registered.
        const options = await generateAuthenticationOptions({
            timeout: 60000,
            allowCredentials: [],
            userVerification: "required",
            rpID,
        });
 
        req.session.currentChallenge = options.challenge;
        res.send(options);
    } catch (error) {
        next(
            error instanceof CustomError
                ? error
                : new CustomError("Internal Server Error", 500),
        );
    }
};
 
export const handleLoginFinish = async (
    req: Request,
    res: Response,
    next: NextFunction,
) => {
    const { body } = req;
    const { currentChallenge, loggedInUserId } = req.session;
 
    if (!loggedInUserId) {
        return next(new CustomError("User ID is missing", 400));
    }
 
    if (!currentChallenge) {
        return next(new CustomError("Current challenge is missing", 400));
    }
 
    try {
        const credentialID = isoBase64URL.toBase64(body.rawId);
        const bodyCredIDBuffer = isoBase64URL.toBuffer(body.rawId);
        const dbCredential: AuthenticatorDevice | null =
            await credentialService.getCredentialByCredentialId(credentialID);
        if (!dbCredential) {
            return next(new CustomError("Credential not registered with this site", 404));
        }
 
        // @ts-ignore
        const user = await userService.getUserById(dbCredential.userID);
        if (!user) {
            return next(new CustomError("User not found", 404));
        }
 
        // @ts-ignore
        dbCredential.credentialID = base64ToUint8Array(dbCredential.credentialID);
        // @ts-ignore
        dbCredential.credentialPublicKey = base64ToUint8Array(
            dbCredential.credentialPublicKey,
        );
 
        let verification: VerifiedAuthenticationResponse;
        const opts: VerifyAuthenticationResponseOpts = {
            response: body,
            expectedChallenge: currentChallenge,
            expectedOrigin: origin,
            expectedRPID: rpID,
            authenticator: dbCredential,
        };
        verification = await verifyAuthenticationResponse(opts);
        const { verified, authenticationInfo } = verification;
 
        if (verified) {
            await credentialService.updateCredentialCounter(
                uint8ArrayToBase64(bodyCredIDBuffer),
                authenticationInfo.newCounter,
            );
            res.send({ verified: true });
        } else {
            next(new CustomError("Verification failed", 400));
        }
    } catch (error) {
        next(
            error instanceof CustomError
                ? error
                : new CustomError("Internal Server Error", 500),
        );
    } finally {
        req.session.currentChallenge = undefined;
        req.session.loggedInUserId = undefined;
    }
};

routes.ts
import express from "express";
import { handleError } from "../middleware/errorHandler";
import { handleRegisterStart, handleRegisterFinish } from "../controllers/registration";
import { handleLoginStart, handleLoginFinish } from "../controllers/authentication";
 
const router = express.Router();
 
router.post("/registerStart", handleRegisterStart);
router.post("/registerFinish", handleRegisterFinish);
router.post("/loginStart", handleLoginStart);
router.post("/loginFinish", handleLoginFinish);
 
router.use(handleError);
 
export { router };

index.html
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Passkey Tutorial</title>
        <link rel="stylesheet" href="css/style.css" />
    </head>
    <body>
        <div class="container">
            <h1>Passkey Tutorial</h1>
            <div id="message"></div>
 
            <div class="input-group">
                <input type="text" id="username" placeholder="Enter username" />
                <button id="registerButton">Register</button>
                <button id="loginButton">Login</button>
            </div>
        </div>
 
        <script src="https://unpkg.com/@simplewebauthn/browser/dist/bundle/index.es5.umd.min.js"></script>
        <script src="js/script.js"></script>
    </body>
</html>

script.js
document.getElementById("registerButton").addEventListener("click", register);
document.getElementById("loginButton").addEventListener("click", login);
 
function showMessage(message, isError = false) {
    const messageElement = document.getElementById("message");
    messageElement.textContent = message;
    messageElement.style.color = isError ? "red" : "green";
}
 
async function register() {
    // Retrieve the username from the input field
    const username = document.getElementById("username").value;
 
    try {
        // Get registration options from your server. Here, we also receive the challenge.
        const response = await fetch("/api/passkey/registerStart", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ username: username }),
        });
        console.log(response);
 
        // Check if the registration options are ok.
        if (!response.ok) {
            throw new Error(
                "User already exists or failed to get registration options from server",
            );
        }
 
        // Convert the registration options to JSON.
        const options = await response.json();
        console.log(options);
 
        // This triggers the browser to display the passkey / WebAuthn modal (e.g. Face ID, Touch ID, Windows Hello).
        // A new attestation is created. This also means a new public-private-key pair is created.
        const attestationResponse =
            await SimpleWebAuthnBrowser.startRegistration(options);
 
        // Send attestationResponse back to server for verification and storage.
        const verificationResponse = await fetch("/api/passkey/registerFinish", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(attestationResponse),
        });
 
        if (verificationResponse.ok) {
            showMessage("Registration successful");
        } else {
            showMessage("Registration failed", true);
        }
    } catch (error) {
        showMessage("Error: " + error.message, true);
    }
}
 
async function login() {
    // Retrieve the username from the input field
    const username = document.getElementById("username").value;
 
    try {
        // Get login options from your server. Here, we also receive the challenge.
        const response = await fetch("/api/passkey/loginStart", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ username: username }),
        });
        // Check if the login options are ok.
        if (!response.ok) {
            throw new Error("Failed to get login options from server");
        }
        // Convert the login options to JSON.
        const options = await response.json();
        console.log(options);
 
        // This triggers the browser to display the passkey / WebAuthn modal (e.g. Face ID, Touch ID, Windows Hello).
        // A new assertionResponse is created. This also means that the challenge has been signed.
        const assertionResponse =
            await SimpleWebAuthnBrowser.startAuthentication(options);
 
        // Send assertionResponse back to server for verification.
        const verificationResponse = await fetch("/api/passkey/loginFinish", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify(assertionResponse),
        });
 
        if (verificationResponse.ok) {
            showMessage("Login successful");
        } else {
            showMessage("Login failed", true);
        }
    } catch (error) {
        showMessage("Error: " + error.message, true);
    }
}

body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    text-align: center;
    padding: 40px;
    background-color: #f3f4f6;
    color: #333;
}
 
.container {
    max-width: 400px;
    margin: auto;
    background: white;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}
 
h1 {
    color: #007bff;
    font-size: 24px;
    margin-bottom: 20px;
}
 
.input-group {
    margin-bottom: 20px;
}
 
input[type="text"] {
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    width: calc(100% - 22px);
}
 
button {
    width: calc(50% - 20px);
    padding: 10px 0;
    margin: 5px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: white;
}
 
button:hover {
    background-color: #0056b3;
}
 
#message {
    color: #dc3545;
    margin: 20px;
}

npm run dev

Docker
# Use an official Node runtime as a parent image
FROM node:20-alpine
 
# Set the working directory in the container
WORKDIR /usr/src/app
 
# Copy package.json and package-lock.json
COPY package*.json ./
 
# Install any needed packages
RUN npm install
 
# Bundle your app's source code inside the Docker image
COPY . .
 
# Make port 8080 available to the world outside this container
EXPOSE 8080
 
# Define the command to run your app
CMD ["npm", "run", "dev"]

docker-compose.yml
version: "3.1"
 
services:
    db:
        image: mysql
        command: --default-authentication-plugin=mysql_native_password
        restart: always
        environment:
            MYSQL_ROOT_PASSWORD: my-secret-pw
            MYSQL_DATABASE: webauthn_db
        ports:
            - "3306:3306"
        volumes:
            - ./init-db.sql:/docker-entrypoint-initdb.d/init-db.sql
 
    app:
        build: .
        ports:
            - "8080:8080"
        environment:
            - DB_HOST=db
            - DB_USER=root
            - DB_PASSWORD=my-secret-pw
            - DB_NAME=webauthn_db
            - SESSION_SECRET=secret123
        depends_on:
            - db