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FIDO2AppBackend/routes/register.js
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import express from "express"; | |
import fido2lib from "@dannymoerkerke/fido2-lib"; | |
import base64url from "base64url"; | |
import crypto from "crypto"; | |
import cfg from "config"; | |
import User from "../models/user.js"; | |
const mode = process.env.NODE_ENV || "dev"; | |
const config = cfg.get(mode); | |
const router = express.Router(); | |
const { Fido2Lib } = fido2lib; | |
const fido = new Fido2Lib({ | |
timeout: 60000, | |
rpName: "WebAuthnUX", | |
rpIcon: "https://whatpwacando.today/src/img/icons/icon-512x512.png", | |
challengeSize: 128, | |
attestation: "none", | |
cryptoParams: [-7, -257], | |
authenticatorAttachment: "platform", | |
authenticatorRequireResidentKey: false, | |
authenticatorUserVerification: "required", | |
}); | |
router.post("/registration-options", async (req, res) => { | |
const { email } = req.body; | |
if (!email) { | |
console.log("Missing email"); | |
return res.status(400).json({ error: "Missing email field" }); | |
} | |
const userExists = await User.findOne({ email }); | |
if (userExists) { | |
console.log("User already exists"); | |
return res.status(400).json({ error: "User already exists" }); | |
} | |
req.session.userHandle = crypto.randomBytes(32); | |
const registrationOptions = await fido.attestationOptions(); | |
req.session.challenge = Buffer.from(registrationOptions.challenge); | |
registrationOptions.user.id = req.session.userHandle; | |
registrationOptions.challenge = Buffer.from(registrationOptions.challenge); | |
// iOS | |
registrationOptions.authenticatorSelection = { | |
authenticatorAttachment: "platform", | |
}; | |
res.json(registrationOptions); | |
}); | |
router.post("/register", async (req, res) => { | |
const { credential, email, firstName, lastName, regDuration } = req.body; | |
const challenge = new Uint8Array(req.session.challenge.data).buffer; | |
const base64RawId = credential.rawId; | |
credential.rawId = new Uint8Array(Buffer.from(credential.rawId, "base64")).buffer; | |
credential.response.attestationObject = base64url.decode( | |
credential.response.attestationObject, | |
"base64" | |
); | |
credential.response.clientDataJSON = base64url.decode( | |
credential.response.clientDataJSON, | |
"base64" | |
); | |
const attestationExpectations = { | |
challenge, | |
origin: config.siteUrl, | |
factor: "either", | |
}; | |
try { | |
const regResult = await fido.attestationResult(credential, attestationExpectations); | |
req.session.publicKey = regResult.authnrData.get("credentialPublicKeyPem"); | |
req.session.prevCounter = regResult.authnrData.get("counter"); | |
const user = await User.create({ | |
id: req.session.userHandle, | |
credentialId: base64RawId, | |
firstName, | |
lastName, | |
email, | |
regDuration: regDuration, | |
}); | |
user.save(); | |
console.log("Created new account for: ", email); | |
res.json({ status: "ok" }); | |
} catch (e) { | |
console.log("error", e); | |
res.status(500).json({ error: e }); | |
} | |
}); | |
router.post("/authentication-options", async (req, res) => { | |
const authnOptions = await fido.assertionOptions(); | |
const { email } = req.body; | |
const user = await User.findOne({ email }); | |
if (user) { | |
req.session.challenge = Buffer.from(authnOptions.challenge); | |
req.session.userHandle = user.id; | |
authnOptions.challenge = Buffer.from(authnOptions.challenge); | |
authnOptions.rawId = user.credentialId; | |
res.json(authnOptions); | |
} else { | |
res.status(404).json({ error: "User does not exist." }); | |
} | |
}); | |
router.post("/authenticate", async (req, res) => { | |
const { credential, authDuration, email } = req.body; | |
credential.rawId = new Uint8Array(Buffer.from(credential.rawId, "base64")).buffer; | |
const challenge = new Uint8Array(req.session.challenge.data).buffer; | |
const { publicKey, prevCounter } = req.session; | |
if (publicKey === "undefined" || prevCounter === undefined) { | |
console.log("Not found"); | |
res.status(404).json({ error: "Credential not found" }); | |
} else { | |
const assertionExpectations = { | |
challenge, | |
origin: config.siteUrl, | |
factor: "either", | |
publicKey, | |
prevCounter, | |
userHandle: new Uint8Array(Buffer.from(req.session.userHandle, "base64")).buffer, | |
}; | |
try { | |
await fido.assertionResult(credential, assertionExpectations); | |
await User.findOneAndUpdate({ email: email }, { authDuration: authDuration }); | |
res.json({ status: "ok" }); | |
} catch (e) { | |
console.log(e); | |
res.status(500).json({ error: "Failed due internal server error" }); | |
} | |
} | |
}); | |
export default router; |