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311 lines (265 loc) · 8.98 KB
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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' });
}
}