JWT & WebAuthn demo

Utilizing JWT & WebAuthn together in a backend API.

Didn't use Redis for this, since I wanted it to work out-of-the-box for people lacking the PHPRedis extension.

On a live website, Redis or Memcached should be employed to cache data from database, and to blacklist JWT tokens on logout/password reset.

Showcase

jwt-webauthn-php.mp4

Requirements

PHP >= 8.0.0

MySQL Server with mysqlnd

Setup

Import schema.sql into MySQL or MariaDB and you can run the demo.

For a live website, make sure to change credentials first.

Privacy

Emails are hashed with SHA1 so that the operator can't see plain-text emails.

No model name or serial numbers are collected for WebAuthn. The operator can't tell if you're using YubiKey or SoloKey, or any other WebAuthn-compatible device

Database sample

Accounts table:

id	email	password	securityKey
21	26bead3658ccd9d4598bdca509f9b42cf6b8a3f5	$2y$10$s...	1

securitykeys table:

id	account	credentialId	credentialPublicKey
3	21	WJTV6t9GmYgGVS8h2OHkZkPGeqUECCe3xOc5sds6WCpMSi8r+9oWZsIdQiEp/nFUkGnv2PqPaZ9ezs6wnGDfkQ==	-----BEGIN PUBLIC KEY-----MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEoTQh+4LXNHgMEtAgLrrkJBdFXPoZtciHcs+dJbKA7O/GYdIyfI92Pa8RMoHTCE5EuMp2XkqdxUgTmiq+Ao6AMw==-----END PUBLIC KEY-----

JWT sample

eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MjEsImF1dGgiOnRydWUsIm1mYSI6bnVsbCwiZW1haWwiOiIyNmJlYWQzNjU4Y2NkOWQ0NTk4YmRjYTUwOWY5YjQyY2Y2YjhhM2Y1In0.065m3mWiufxgUDSj2VUAGS3x4bwW6KLcFBs1shJCrlA

Decoded

{"typ":"JWT","alg":"HS256"}{"id":21,"auth":true,"mfa":null,"email":"26bead3658ccd9d4598bdca509f9b42cf6b8a3f5"}<signatureHere>

Credentials

In a live website, these credentials should be changed and stored in a seperate configuration file such as credentials.php, and then you add credentials.php to the .gitignore and make a credentials.example.php for public use.

Another way would be setting the credentials via FastCGI Params in nginx, to create further seperation between the credentials and the source code.

JWT Secret

jwt-webauthn-php/api/main.php

Line 15 in ebffedc

$session = Firebase\JWT\JWT::decode($_COOKIE[$this->sessionName], new Firebase\JWT\Key('yWvati2Z94ZV6XFaSwC7gqdsabtTYHqMnzWB7o58AvCXHkheS8ANfHLKTTwXE9cXHg7GH2bSb9q95Lo2He9XDWtqDBwJzvKFbX8ymeLPkhFQkJxF8GDbmpRUfeXctiLi', 'HS256'));

jwt-webauthn-php/api/main.php

Line 29 in ebffedc

$encoded = Firebase\JWT\JWT::encode($payload, 'yWvati2Z94ZV6XFaSwC7gqdsabtTYHqMnzWB7o58AvCXHkheS8ANfHLKTTwXE9cXHg7GH2bSb9q95Lo2He9XDWtqDBwJzvKFbX8ymeLPkhFQkJxF8GDbmpRUfeXctiLi', 'HS256');

MySQL Server

jwt-webauthn-php/api/main.php

Line 53 in ebffedc

$db = new Database("localhost", "root", "", "jwt-webauthn-php");

jwt-webauthn-php/api/main.php

Line 79 in ebffedc

$db = new Database("localhost", "root", "", "jwt-webauthn-php");

jwt-webauthn-php/api/routing.php

Line 81 in ebffedc

$db = new Database("localhost", "root", "", "jwt-webauthn-php");