JavaScriptSolidServer/src/idp/passkey.js at gh-pages · JavaScriptSolidServer/JavaScriptSolidServer · GitHub

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/**

* Passkey (WebAuthn) authentication endpoints

* Handles registration and authentication of passkey credentials

import {

generateRegistrationOptions,

verifyRegistrationResponse,

generateAuthenticationOptions,

verifyAuthenticationResponse

} from '@simplewebauthn/server';

import crypto from 'crypto';

import * as accounts from './accounts.js';

// Temporary challenge storage (in-memory, cleared on restart)

// For production clusters, use Redis or session storage

const challenges = new Map();

const MAX_CHALLENGES = 10000; // Prevent unbounded growth

// Clean up expired challenges periodically

// Use unref() so this timer doesn't prevent process exit (important for tests)

const cleanupInterval = setInterval(() => {

const now = Date.now();

for (const [key, value] of challenges.entries()) {

if (now > value.expires) {

challenges.delete(key);

}

}, 60000);

cleanupInterval.unref();

/**

* Store a challenge with size limit enforcement

function storeChallenge(key, value) {

// If at capacity, remove oldest expired entries first

if (challenges.size >= MAX_CHALLENGES) {

const now = Date.now();

for (const [k, v] of challenges.entries()) {

if (now > v.expires) {

challenges.delete(k);

}

if (challenges.size < MAX_CHALLENGES) break;

}

// If still at capacity, reject (DoS protection)

if (challenges.size >= MAX_CHALLENGES) {

return false;

}

challenges.set(key, value);

return true;

}

/**

* Get Relying Party configuration from request

* Handles both IPv4 (with port) and IPv6 addresses correctly

function getRP(request) {

let hostname;

try {

// Use URL parsing to correctly extract hostname (handles IPv6)

const url = new URL(`${request.protocol}://${request.hostname}`);

hostname = url.hostname;

} catch {

// Fallback: strip port from hostname (IPv4 only)

hostname = String(request.hostname || '').split(':')[0];

}

return {

name: 'Solid Pod',

id: hostname

};

}

/**

* Get origin from request

function getOrigin(request) {

return `${request.protocol}://${request.hostname}`;

}

/**

* POST /idp/passkey/register/options

* Generate registration options for a logged-in user

export async function registrationOptions(request, reply) {

const { accountId } = request.body || {};

if (!accountId) {

return reply.code(401).send({ error: 'Must provide accountId' });

}

const account = await accounts.findById(accountId);

if (!account) {

return reply.code(404).send({ error: 'Account not found' });

}

const rp = getRP(request);

const options = await generateRegistrationOptions({

rpName: rp.name,

rpID: rp.id,

userID: new TextEncoder().encode(account.id),

userName: account.username,

userDisplayName: account.username,

attestationType: 'none', // Don't require attestation for privacy

excludeCredentials: (account.passkeys || []).map(pk => ({

id: Buffer.from(pk.credentialId, 'base64url'),

type: 'public-key',

transports: pk.transports

})),

authenticatorSelection: {

residentKey: 'preferred',

userVerification: 'preferred'

}

});

// Store challenge for verification with unique key (prevents race conditions from multiple tabs)

const challengeKey = crypto.randomUUID();

const stored = storeChallenge(challengeKey, {

challenge: options.challenge,

type: 'registration',

accountId: account.id,

expires: Date.now() + 60000 // 1 minute

});

if (!stored) {

return reply.code(503).send({ error: 'Server busy, try again later' });

}

return reply.send({ ...options, challengeKey });

}

/**

* POST /idp/passkey/register/verify

* Verify and store the registration response

export async function registrationVerify(request, reply) {

const { accountId, credential, name, challengeKey } = request.body || {};

if (!accountId || !credential || !challengeKey) {

return reply.code(400).send({ error: 'Missing required fields' });

}

const stored = challenges.get(challengeKey);

if (!stored || stored.type !== 'registration' || Date.now() > stored.expires) {

return reply.code(400).send({ error: 'Challenge expired or invalid' });

}

// Verify the accountId matches the challenge

if (stored.accountId !== accountId) {

return reply.code(403).send({ error: 'Account mismatch' });

}

const account = await accounts.findById(accountId);

if (!account) {

return reply.code(404).send({ error: 'Account not found' });

}

const rp = getRP(request);

try {

const verification = await verifyRegistrationResponse({

response: credential,

expectedChallenge: stored.challenge,

expectedOrigin: getOrigin(request),

expectedRPID: rp.id

});

if (!verification.verified || !verification.registrationInfo) {

request.log.warn({ verified: verification.verified, hasInfo: !!verification.registrationInfo }, 'Passkey registration verification failed');

return reply.code(400).send({ error: 'Verification failed' });

}

const { credential: regCredential } = verification.registrationInfo;

await accounts.addPasskey(accountId, {

credentialId: regCredential.id, // Already base64url string

publicKey: Buffer.from(regCredential.publicKey).toString('base64url'),

counter: regCredential.counter,

transports: regCredential.transports || credential.response?.transports || [],

name: name || 'Security Key'

});

challenges.delete(challengeKey);

return reply.send({ success: true });

} catch (err) {

request.log.error({ err }, 'Passkey registration error');

return reply.code(400).send({ error: 'Passkey registration failed' });

}

/**

* POST /idp/passkey/login/options

* Generate authentication options

export async function authenticationOptions(request, reply) {

const { username } = request.body || {};

const rp = getRP(request);

let allowCredentials = [];

let accountId = null;

// If username provided, limit to that user's credentials

if (username) {

const account = await accounts.findByUsername(username);

if (account && account.passkeys?.length) {

accountId = account.id;

allowCredentials = account.passkeys.map(pk => ({

id: Buffer.from(pk.credentialId, 'base64url'),

type: 'public-key',

transports: pk.transports

}));

}

const options = await generateAuthenticationOptions({

rpID: rp.id,

allowCredentials,

userVerification: 'preferred'

});

// Store challenge - use visitorId for anonymous requests

const challengeKey = accountId || request.body?.visitorId || crypto.randomUUID();

const stored = storeChallenge(challengeKey, {

challenge: options.challenge,

type: 'authentication',

accountId,

expires: Date.now() + 60000 // 1 minute

});

if (!stored) {

return reply.code(503).send({ error: 'Server busy, try again later' });

}

return reply.send({ ...options, challengeKey });

}

/**

* POST /idp/passkey/login/verify

* Verify authentication and return account info

export async function authenticationVerify(request, reply) {

const { challengeKey, credential } = request.body || {};

if (!challengeKey || !credential) {

return reply.code(400).send({ error: 'Missing challengeKey or credential' });

}

const stored = challenges.get(challengeKey);

if (!stored || stored.type !== 'authentication' || Date.now() > stored.expires) {

return reply.code(400).send({ error: 'Challenge expired or invalid' });

}

// Find account by credential ID

const credentialId = credential.id;

const account = stored.accountId

? await accounts.findById(stored.accountId)

: await accounts.findByCredentialId(credentialId);

if (!account) {

return reply.code(400).send({ error: 'Unknown credential' });

}

const passkey = account.passkeys?.find(pk => pk.credentialId === credentialId);

if (!passkey) {

return reply.code(400).send({ error: 'Credential not found' });

}

const rp = getRP(request);

try {

const verification = await verifyAuthenticationResponse({

response: credential,

expectedChallenge: stored.challenge,

expectedOrigin: getOrigin(request),

expectedRPID: rp.id,

credential: {

id: Buffer.from(passkey.credentialId, 'base64url'),

publicKey: Buffer.from(passkey.publicKey, 'base64url'),

counter: passkey.counter

}

});

if (!verification.verified) {

return reply.code(400).send({ error: 'Verification failed' });

}

// Update counter to prevent replay attacks

await accounts.updatePasskeyCounter(

account.id,

credentialId,

verification.authenticationInfo.newCounter

);

// Update last login

await accounts.updateLastLogin(account.id);

challenges.delete(challengeKey);

// Return account info for session creation

return reply.send({

success: true,

accountId: account.id,

webId: account.webId

});

} catch (err) {

request.log.error({ err }, 'Passkey authentication error');

return reply.code(400).send({ error: 'Authentication failed' });

}

JavaScriptSolidServer/src/idp/passkey.js at gh-pages · JavaScriptSolidServer/JavaScriptSolidServer · GitHub

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