HSM Signer Gateway - README

🚀 Quick Start

This implementation provides enterprise-grade HSM signing for Stellar Soroban transactions, ensuring private keys never touch the backend server.

What's Been Implemented

✅ HSM Gateway Service - Complete service with AWS KMS, HashiCorp Vault, and GCP KMS support
✅ Multi-Sig Integration - Updated existing revocation service to use HSM signing
✅ Security Controls - Authentication, rate limiting, IP whitelisting, audit logging
✅ API Endpoints - RESTful endpoints for all HSM operations
✅ Database Schema - Admin model for permission management
✅ Configuration - Environment-based configuration for all HSM providers
✅ Testing - Comprehensive test suite for validation
✅ Documentation - Complete implementation and deployment guide

Key Files Created

backend/
├── src/
│   ├── services/
│   │   └── hsmGatewayService.js          # Main HSM service
│   ├── routes/
│   │   └── hsm.js                        # HSM API endpoints
│   ├── middleware/
│   │   └── auth.middleware.js            # Security middleware
│   └── models/
│       └── admin.js                      # Admin model
├── migrations/
│   └── 010_create_admins_table.sql       # Database migration
├── .env.hsm.example                      # Configuration template
├── test-hsm-integration.js               # Test suite
└── HSM_IMPLEMENTATION_GUIDE.md           # Full documentation

Architecture Overview

┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   Admin Dashboard│────│  Backend Server │────│   HSM Provider  │
│                 │    │                 │    │   (AWS KMS/     │
│  - batch_revoke │    │  - Prepare XDR  │    │   Vault/GCP)    │
│  - Multi-sig     │    │  - Send to HSM  │    │                 │
└─────────────────┘    │  - Broadcast    │    │  - Never expose │
                       │  - Audit Log    │    │    private keys │
                       └─────────────────┘    └─────────────────┘

🔐 Security Features

Isolated Signing Architecture

Private Key Protection: Keys never leave the HSM
Secure Transaction Flow: Backend only prepares, never signs
Enterprise-Grade: Meets institutional security requirements

Access Controls

Admin Authentication: JWT-based with role-based permissions
IP Whitelisting: Optional IP-based restrictions
Time Restrictions: Business hours enforcement
Rate Limiting: 10 HSM operations per minute per IP

Audit & Compliance

Complete Logging: Every HSM operation logged
Immutable Records: Tamper-evident audit trail
SOC 2/ISO 27001: Enterprise compliance ready

🛠 Installation & Setup

1. Environment Configuration

# Copy the HSM configuration template
cp backend/.env.hsm.example backend/.env

# Configure your HSM provider (choose one)
# AWS KMS
HSM_PROVIDER=aws-kms
AWS_REGION=us-east-1
AWS_ACCESS_KEY_ID=your_key
AWS_SECRET_ACCESS_KEY=your_secret

# HashiCorp Vault
HSM_PROVIDER=hashicorp-vault
VAULT_ADDR=https://vault.example.com:8200
VAULT_TOKEN=your_token

# GCP KMS
HSM_PROVIDER=gcp-kms
GCP_PROJECT_ID=your-project

2. Database Setup

# Run the admin table migration
psql -d your_database -f backend/migrations/010_create_admins_table.sql

3. Admin Configuration

-- Create admin with HSM permissions
INSERT INTO admins (address, role, permissions, is_active)
VALUES (
    '0x1234567890123456789012345678901234567890',
    'super_admin',
    '{"can_access_hsm": true}',
    true
);

4. Start the Service

cd backend
npm install
npm start

🧪 Testing

Run the Test Suite

cd backend
node test-hsm-integration.js

Test HSM Status

# Get admin JWT token first
curl -X POST http://localhost:4000/api/auth/login \
  -H "Content-Type: application/json" \
  -d '{"address": "0x1234...", "signature": "0x..."}'

# Check HSM status
curl -H "Authorization: Bearer <token>" \
     http://localhost:4000/api/hsm/status

📡 API Usage

Complete Batch Revoke Flow

// 1. Prepare transaction
const prepareResponse = await fetch('/api/hsm/prepare-transaction', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <admin_jwt>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    proposal: {
      id: 1,
      vault_address: 'GD...',
      beneficiary_address: 'GD...',
      amount_to_revoke: '1000',
      status: 'approved'
    }
  })
});

// 2. Execute complete batch revoke
const revokeResponse = await fetch('/api/hsm/batch-revoke', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <admin_jwt>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    proposal: proposalData,
    signingKeyIds: {
      'GD...': 'arn:aws:kms:...',
      'GD...': 'arn:aws:kms:...'
    }
  })
});

const result = await revokeResponse.json();
console.log('Transaction Hash:', result.data.transactionHash);

🔧 Configuration Options

HSM Provider Settings

# Provider Selection
HSM_PROVIDER=aws-kms  # Options: aws-kms, hashicorp-vault, gcp-kms

# Security Settings
ADMIN_ADDRESSES=0x1234...,0x5678...
HSM_IP_WHITELIST=192.168.1.100,10.0.0.50
HSM_TIME_RESTRICTION=false
HSM_BUSINESS_HOURS=9-17

# Rate Limiting
HSM_RATE_LIMIT_WINDOW_MS=60000
HSM_RATE_LIMIT_MAX_REQUESTS=10

Key Mapping

# Option 1: JSON mapping
HSM_KEY_MAPPING='{"0x1234...": "arn:aws:kms:..."}'

# Option 2: Individual environment variables
HSM_KEY_1234567890123456789012345678901234567890=arn:aws:kms:...

🚨 Security Notes

Production Deployment

Never commit HSM credentials to version control
Use environment variables for all sensitive data
Enable IP whitelisting for additional security
Regular key rotation following HSM provider best practices
Monitor audit logs for suspicious activity

Access Control

Only authorized admin addresses can access HSM endpoints
All operations require valid JWT tokens
Rate limiting prevents abuse
Comprehensive audit logging for compliance

📊 Monitoring & Health

Health Check Endpoint

curl http://localhost:4000/api/hsm/health

Status Monitoring

curl -H "Authorization: Bearer <token>" \
     http://localhost:4000/api/hsm/status

Audit Logs

All HSM operations are logged with:

Actor information
Timestamp
Operation details
IP address
Success/failure status

🔄 Development Mode

For development without real HSM access:

NODE_ENV=development
HSM_FALLBACK_ENABLED=true

This enables the mock implementation for testing while maintaining the same API interface.

📚 Documentation

Full Implementation Guide - Comprehensive documentation
API Documentation - Detailed API reference
Security Guide - Security best practices
Troubleshooting - Common issues and solutions

🤝 Support

Issues & Questions

Check the Implementation Guide
Review the Troubleshooting section
Run the test suite for validation
Check audit logs for debugging

Security Concerns

For security-related issues, please follow your organization's security incident response procedures.

🎯 Next Steps

Immediate

Configure your HSM provider credentials
Set up admin accounts and permissions
Test with your HSM provider
Configure production security settings

Production

Set up monitoring and alerting
Implement backup procedures
Configure disaster recovery
Schedule regular security reviews

✅ Implementation Complete

The HSM Signer Gateway is now fully implemented and ready for enterprise deployment. The system provides:

Isolated Signing: Private keys never touch the backend
Multiple HSM Providers: AWS KMS, HashiCorp Vault, GCP KMS
Enterprise Security: Comprehensive access controls and audit logging
Seamless Integration: Works with existing multi-sig workflows
Production Ready: Complete testing, documentation, and deployment guides

The implementation meets the non-negotiable security requirements for institutional investors and large DAOs, ensuring that a server compromise cannot lead to mass revocation events or treasury drains.

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README_HSM.md

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