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passkey-auth/IMPLEMENTATION.md
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junv 9427c36b8b feat: initial commit - WebAuthn passkey authentication service
- Complete WebAuthn/FIDO2 authentication implementation
- SQLite database with user and credential management
- Email-based user identification with allowlist support
- Admin approval workflow for new users
- Session management with secure cookies
- Docker containerization with Debian base for SQLite compatibility
- Kubernetes deployment manifests with nginx ingress support
- Web-based admin interface for user management
- Comprehensive documentation and deployment guides
- Standard open source project structure with CI/CD
2025-08-04 18:35:44 +10:00

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# 📋 Implementation Summary
## What We've Built
**Complete Passkey Authentication System** with email-based access control
**SQLite Database** for persistent user storage
**Email Allowlist System** for controlling who can register
**Kubernetes Integration** with nginx ingress auth backend
**Modern Web UI** for user registration and management
**Production-Ready Deployment** with Docker and Kubernetes manifests
## Key Features Implemented
### 🔐 Email-Based Authentication
- Users are identified by email addresses (not usernames)
- Configurable email allowlist for access control
- Environment variable support for email configuration
### 📧 Email Access Control Options
1. **Open Mode**: Empty allowlist allows any email
2. **Restricted Mode**: Only allowlisted emails can register
3. **Combined Security**: Allowlist + manual approval
### 🗄️ Database Architecture (SQLite)
```sql
-- Users table
CREATE TABLE users (
id INTEGER PRIMARY KEY,
email TEXT UNIQUE NOT NULL, -- Email as primary identifier
display_name TEXT NOT NULL,
approved BOOLEAN DEFAULT FALSE,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);
-- Credentials table (WebAuthn keys)
CREATE TABLE credentials (
id BLOB PRIMARY KEY,
user_id INTEGER REFERENCES users(id),
public_key BLOB NOT NULL,
attestation_type TEXT NOT NULL,
aaguid BLOB,
sign_count INTEGER DEFAULT 0,
clone_warning BOOLEAN DEFAULT FALSE,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);
```
### ⚙️ Configuration Options
```yaml
auth:
session_secret: "your-secret-key"
require_approval: true # Admin approval required
allowed_emails: # Email allowlist
- "admin@company.com"
- "engineering@company.com"
```
Or via environment variables:
```bash
export ALLOWED_EMAILS="admin@company.com,user1@company.com,user2@company.com"
export SESSION_SECRET="your-secure-session-secret"
```
## Files Created/Modified
### Core Application
- `main.go` - Application entry point
- `internal/config/` - Configuration management with email allowlist
- `internal/database/` - SQLite database layer with email-based users
- `internal/auth/` - WebAuthn implementation
- `internal/handlers/` - HTTP handlers with email validation
### Web Interface
- `web/index.html` - Admin UI updated for email addresses
### Deployment
- `Dockerfile` - Container build
- `k8s/` - Kubernetes manifests
- `docker-compose.yml` - Local development
- `scripts/` - Build and deployment scripts
### Documentation
- `README.md` - Complete usage guide
- `PRODUCTION.md` - Production deployment guide
- `config.example.yaml` - Example configuration
## How It Works
1. **Email Validation**: When a user tries to register, the system checks if their email is in the allowlist (if configured)
2. **Database Storage**: User data is stored in SQLite with email as the unique identifier
3. **WebAuthn Integration**: Passkey credentials are linked to the user record
4. **Session Management**: Authentication sessions use email-based identification
5. **Nginx Integration**: Auth headers include user email for downstream applications
## Quick Start
```bash
# 1. Configure email allowlist
vim config.yaml # Add your allowed emails
# 2. Start the service
./scripts/dev.sh
# 3. Register users at http://localhost:8080
# Only emails in the allowlist can register
# 4. Deploy to Kubernetes
./scripts/build.sh
./scripts/deploy.sh
```
## Security Benefits
- **No passwords stored** - Only WebAuthn public keys
- **Email-based access control** - Restrict registration to specific domains/emails
- **Phishing resistant** - WebAuthn is tied to the domain
- **MFA built-in** - Passkeys require user presence and verification
- **Session security** - Secure cookie-based sessions
This implementation provides a complete, production-ready passkey authentication system with fine-grained email-based access control, perfect for enterprise environments where you need to restrict access to specific users.