Authentication Module

Overview

This module provides a tiered authentication system for api-ape WebSocket connections. It supports OPAQUE-based password authentication where the server never learns raw passwords, with MFA (WebAuthn/TOTP) for elevated security and extensibility for enterprise SSO adapters.

Key capabilities:

OPAQUE/PAKE authentication — Password-authenticated key exchange (server never sees raw password)
MFA support — WebAuthn (FIDO2) and TOTP (RFC 6238) for Tier 2 elevation
Passport.js compatible — MFA adapters work with existing Passport.js strategies
Tiered security model — Guest → Basic → Elevated → High Security
State machine enforcement — No-downgrade rule, timeout handling, rate limiting
Authorization middleware — Per-endpoint tier and permission checks
Adapter pattern — Pluggable authentication methods (OPAQUE, WebAuthn, TOTP, LDAP, SAML, OAuth2)

Contributing? See the module files for implementation details.

Architecture

┌────────────────────────────────────────────────────────────────────┐
│                     AuthFramework                                   │
│  ┌──────────────────────────────────────────────────────────────┐  │
│  │  Adapter Registry                                             │  │
│  │  - OPAQUE (Tier 1) ✓                                         │  │
│  │  - WebAuthn (Tier 2 MFA) ✓                                   │  │
│  │  - TOTP (Tier 2 MFA) ✓                                       │  │
│  │  - LDAP, SAML, OAuth2 (Tier 1, planned)                      │  │
│  └──────────────────────────────────────────────────────────────┘  │
│  ┌──────────────────────────────────────────────────────────────┐  │
│  │  Per-Socket State Machines                                    │  │
│  │  - Tracks auth state per clientId                            │  │
│  │  - Enforces tier requirements                                │  │
│  └──────────────────────────────────────────────────────────────┘  │
│  ┌──────────────────────────────────────────────────────────────┐  │
│  │  Message Router                                               │  │
│  │  - Routes auth messages to appropriate adapter               │  │
│  │  - Handles opaque_*, webauthn_*, totp_*, mfa_* messages     │  │
│  └──────────────────────────────────────────────────────────────┘  │
└────────────────────────────────────────────────────────────────────┘

Authentication Tiers

Tier	Name	Description
0	GUEST	Unauthenticated, public endpoints only
1	BASIC	Identity verified via OPAQUE/SRP or enterprise SSO
2	ELEVATED	Tier 1 + MFA (WebAuthn or TOTP)
3	HIGH_SECURITY	Full 2-of-3 scheme for client-side key reconstruction

Quick Start

1. Create the Auth Framework

const { createAuthFramework } = require('api-ape/server/security/auth');
const { createAuthMiddleware } = require('api-ape/server/socket/authMiddleware');

const authFramework = createAuthFramework({
  opaque: {
    // Provide your user storage functions
    getUser: async (username) => db.users.findOne({ username }),
    saveUser: async (username, data) => db.users.insertOne({ username, ...data })
  },
  webauthn: {
    rpId: 'example.com',
    rpName: 'My App',
    // Optional: provide credential storage
    getCredentials: async (userId) => db.webauthn.find({ userId }),
    saveCredential: async (userId, credential) => db.webauthn.insertOne({ userId, ...credential })
  },
  totp: {
    issuer: 'My App',
    // Optional: provide secret storage
    getSecret: async (userId) => db.totp.findOne({ userId }),
    saveSecret: async (userId, data) => db.totp.upsertOne({ userId }, data)
  },
  mfaMethods: ['webauthn', 'totp'],
  onAuthSuccess: (clientId, principal) => {
    console.log(`${clientId} authenticated as ${principal.userId}`);
  },
  onMFASuccess: (clientId, principal, method) => {
    console.log(`${clientId} elevated via ${method}`);
  }
});

2. Configure Authorization Rules

const authMiddleware = createAuthMiddleware({
  requirements: {
    'admin/*': { tier: 2 },           // Admin endpoints require MFA
    'user/*': { tier: 1 },            // User endpoints require auth
    'public/*': { tier: 0 }           // Public endpoints allow guests
  },
  defaultTier: 0
});

3. Pass to ape()

const { ape } = require('api-ape');

ape(server, {
  where: 'api',
  authFramework,      // Enable authentication
  authMiddleware      // Enable authorization
});

Message Protocol

OPAQUE Registration (Tier 1)

Client                              Server
  |-- opaque_reg_start ----------->|  { user, clientNonce, regRequest }
  |<- opaque_reg_response ---------|  { serverNonce, ts, regResponse }
  |-- opaque_reg_finish ---------->|  { regRecord }
  |<- opaque_reg_ok ---------------|  { msg: "registered" }

OPAQUE Authentication (Tier 1)

Client                              Server
  |-- opaque_auth_start ---------->|  { user, clientNonce }
  |<- opaque_auth_1 ---------------|  { serverNonce, ts, envelope, oprfResponse }
  |-- opaque_auth_2 -------------->|  { clientAuth }
  |<- opaque_auth_ok --------------|  { assignedPrincipal, serverProof, tier: 1 }

WebAuthn Registration (MFA Setup)

Client                              Server
  |-- webauthn_reg_start --------->|  { userId, userName }
  |<- webauthn_reg_challenge ------|  { challenge, rp, user, pubKeyCredParams }
  |-- webauthn_reg_finish -------->|  { challenge, attestation }
  |<- webauthn_reg_ok -------------|  { credentialId }

WebAuthn Authentication (Tier 2 Elevation)

Client                              Server
  |-- webauthn_auth_start -------->|  { userId }
  |<- webauthn_auth_challenge -----|  { challenge, allowCredentials }
  |-- webauthn_auth_finish ------->|  { challenge, assertion }
  |<- webauthn_auth_ok ------------|  { tier: 2 }

TOTP Setup

Client                              Server
  |-- totp_setup_start ----------->|  { userId }
  |<- totp_setup_challenge --------|  { secret, otpauthUri }
  |-- totp_setup_verify ---------->|  { code }
  |<- totp_setup_ok ---------------|  { }

TOTP Verification (Tier 2 Elevation)

Client                              Server
  |-- totp_verify ---------------->|  { userId, code }
  |<- totp_ok --------------------|  { tier: 2 }

Generic MFA Challenge Flow

Client                              Server
  |-- mfa_challenge -------------->|  { }
  |<- mfa_challenge ---------------|  { methods: [{ method: "totp" }, { method: "webauthn", challenge: {...} }] }
  |-- mfa_verify ----------------->|  { method: "totp", code: "123456" }
  |<- mfa_elevated ----------------|  { method: "totp", tier: 2 }

Passport.js Compatibility

Both WebAuthn and TOTP adapters are compatible with Passport.js:

const passport = require('passport');
const { WebAuthnStrategy, TOTPStrategy } = require('api-ape/server/security/auth');

// Use with Passport.js
passport.use('webauthn', new WebAuthnStrategy({
  rpId: 'example.com',
  rpName: 'My App'
}, (user, done) => {
  // Custom verification logic
  done(null, user);
}));

passport.use('totp', new TOTPStrategy({
  issuer: 'My App'
}, (user, done) => {
  // Custom verification logic
  done(null, user);
}));

Controller Context

After authentication, controllers have access to auth state via this:

// api/protected/data.js
module.exports = function(query) {
  // Check authentication
  if (!this.isAuthenticated) {
    throw new Error('Authentication required');
  }

  // Access user info
  console.log('User:', this.principal.userId);
  console.log('Roles:', this.principal.roles);
  console.log('Tier:', this.authTier);

  // Check tier requirement
  if (!this.requiresTier(2)) {
    throw new Error('MFA required for this operation');
  }

  return { data: 'sensitive info' };
};

Available Properties

Property	Type	Description
`this.isAuthenticated`	`boolean`	Whether socket is authenticated (Tier ≥ 1)
`this.authTier`	`number`	Current tier (0-3)
`this.principal`	`object\|null`	User info: `{ userId, roles, permissions }`
`this.authState`	`object\|null`	Full auth state object
`this.requiresTier(n)`	`function`	Check if socket meets minimum tier

Client Tracking

Query auth state for any connected client:

const client = this.clients.get(targetClientId);

if (client.isAuthenticated) {
  console.log('User:', client.authState.principal.userId);
  console.log('Tier:', client.authTier);
}

State Machine

GUEST → AUTHENTICATING → AUTHENTICATED (Tier 1)
                               │
               ┌───────────────┼───────────────┐
               │               │               │
         MFA_PENDING    KEY_RECOVERY     (stay Tier 1)
               │               │
               ▼               ▼
         ELEVATED (2)   HIGH_SECURITY (3)

Rules:

No downgrade after authentication
Higher tiers require completing lower tiers first
Auth timeout closes incomplete sessions
Rate limiting and lockout after failed attempts

Security Features

Feature	Description
Password protection	OPAQUE ensures server never sees raw password
Replay prevention	Single-use nonces with 30s expiry
No-downgrade	Cannot return to lower tier after auth
Rate limiting	Lockout after configurable failed attempts
Session binding	Auth bound to `clientId + nonces + timestamp`
TOTP replay protection	Tracks used counters to prevent code reuse
WebAuthn counter	Validates and updates authenticator counter

File Structure

auth/
├── index.js              # Auth framework coordinator
├── index.test.js         # Integration tests (23 tests)
├── state-machine.js      # State transitions, tier management
├── state-machine.test.js # State machine tests (31 tests)
├── nonce-manager.js      # Single-use nonce handling
├── adapters/
│   ├── opaque.js         # OPAQUE/SRP implementation
│   ├── opaque.test.js    # OPAQUE tests (12 tests)
│   ├── webauthn.js       # WebAuthn/FIDO2 adapter (Passport.js compatible)
│   ├── webauthn.test.js  # WebAuthn tests (25 tests)
│   ├── totp.js           # TOTP RFC 6238 adapter (Passport.js compatible)
│   └── totp.test.js      # TOTP tests (35 tests)
└── handlers/
    └── auth-messages.js  # Message routing

Total: 114 tests passing

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Authentication Module

Overview

Architecture

Authentication Tiers

Quick Start

1. Create the Auth Framework

2. Configure Authorization Rules

3. Pass to ape()

Message Protocol

OPAQUE Registration (Tier 1)

OPAQUE Authentication (Tier 1)

WebAuthn Registration (MFA Setup)

WebAuthn Authentication (Tier 2 Elevation)

TOTP Setup

TOTP Verification (Tier 2 Elevation)

Generic MFA Challenge Flow

Passport.js Compatibility

Controller Context

Available Properties

Client Tracking

State Machine

Security Features

File Structure

See Also

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README.md

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README.md

File metadata and controls

Authentication Module

Overview

Architecture

Authentication Tiers

Quick Start

1. Create the Auth Framework

2. Configure Authorization Rules

3. Pass to ape()

Message Protocol

OPAQUE Registration (Tier 1)

OPAQUE Authentication (Tier 1)

WebAuthn Registration (MFA Setup)

WebAuthn Authentication (Tier 2 Elevation)

TOTP Setup

TOTP Verification (Tier 2 Elevation)

Generic MFA Challenge Flow

Passport.js Compatibility

Controller Context

Available Properties

Client Tracking

State Machine

Security Features

File Structure

See Also