Skip to content

architecture.md

Latest commit

 

History

History
360 lines (274 loc) · 11.2 KB

architecture.md

File metadata and controls

360 lines (274 loc) · 11.2 KB
Raw

VPN Architecture Documentation

Overview

This document describes the architecture of the secure VPN solution built with modern DevOps practices. The system is designed to be scalable, secure, and maintainable.

System Architecture

High-Level Architecture

┌─────────────────────────────────────────────────────────────────┐
│                        Client Layer                            │
├─────────────────────────────────────────────────────────────────┤
│  Mobile Apps  │  Desktop Apps  │  Web Clients  │  IoT Devices  │
└─────────────────────────────────────────────────────────────────┘
                                │
                                ▼
┌─────────────────────────────────────────────────────────────────┐
│                     Load Balancer Layer                        │
├─────────────────────────────────────────────────────────────────┤
│                    HAProxy / NGINX                             │
│              (Health Checks, SSL Termination)                  │
└─────────────────────────────────────────────────────────────────┘
                                │
                                ▼
┌─────────────────────────────────────────────────────────────────┐
│                    Application Layer                           │
├─────────────────────────────────────────────────────────────────┤
│  VPN Servers (WireGuard)  │  Management API  │  Monitoring     │
│  - Encryption/Decryption  │  - User Mgmt     │  - Metrics      │
│  - Key Management         │  - Config Mgmt   │  - Logging      │
│  - Traffic Routing        │  - Client Mgmt   │  - Alerting     │
└─────────────────────────────────────────────────────────────────┘
                                │
                                ▼
┌─────────────────────────────────────────────────────────────────┐
│                    Infrastructure Layer                        │
├─────────────────────────────────────────────────────────────────┤
│  Kubernetes Cluster  │  Container Registry  │  Cloud Storage   │
│  - Pod Management    │  - Image Storage     │  - Data Backup   │
│  - Service Discovery │  - Image Scanning    │  - Config Backup │
│  - Auto-scaling      │  - Vulnerability Mgmt│  - Log Storage   │
└─────────────────────────────────────────────────────────────────┘
                                │
                                ▼
┌─────────────────────────────────────────────────────────────────┐
│                      Cloud Layer                               │
├─────────────────────────────────────────────────────────────────┤
│  AWS / GCP / Azure  │  CDN / Edge Locations  │  DNS Services   │
│  - Compute Instances│  - Global Distribution │  - Load Balancing│
│  - Network Security │  - Caching             │  - Health Checks │
│  - Storage Services │  - DDoS Protection     │  - Failover      │
└─────────────────────────────────────────────────────────────────┘

Component Details

1. VPN Server (WireGuard)

Purpose: Provides secure VPN connectivity using WireGuard protocol.

Key Features:

  • Modern, fast, and secure VPN protocol
  • Built-in encryption and authentication
  • Low latency and high throughput
  • Cross-platform compatibility

Configuration:

  • Server private key management
  • Client peer management
  • Network routing configuration
  • Firewall rules (iptables)

Scaling:

  • Horizontal scaling with multiple server instances
  • Load balancing across server nodes
  • Geographic distribution

2. Management API

Purpose: Provides RESTful API for VPN management operations.

Key Features:

  • User authentication and authorization
  • Client configuration management
  • Real-time monitoring and statistics
  • QR code generation for mobile clients

Endpoints:

  • POST /api/auth/login - User authentication
  • GET /api/clients - List VPN clients
  • POST /api/clients - Create new client
  • GET /api/clients/{id}/config - Get client configuration
  • GET /api/status - Get server status

Security:

  • JWT-based authentication
  • Role-based access control
  • Input validation and sanitization
  • Rate limiting

3. Load Balancer (HAProxy)

Purpose: Distributes traffic across multiple VPN servers.

Key Features:

  • UDP load balancing for WireGuard
  • Health checks and failover
  • SSL termination
  • Statistics and monitoring

Configuration:

  • Round-robin load balancing
  • Health check intervals
  • Backend server management
  • SSL certificate management

4. Monitoring Stack

Components:

  • Prometheus: Metrics collection and storage
  • Grafana: Visualization and dashboards
  • ELK Stack: Log aggregation and analysis
  • AlertManager: Alerting and notifications

Metrics Collected:

  • VPN connection statistics
  • System resource usage
  • Network traffic metrics
  • Application performance metrics

5. Infrastructure

Container Orchestration:

  • Kubernetes for container management
  • Pod auto-scaling based on load
  • Service discovery and load balancing
  • Rolling updates and rollbacks

Infrastructure as Code:

  • Terraform for cloud resource management
  • Multi-cloud support (AWS, GCP, Azure)
  • Automated provisioning and updates
  • Environment-specific configurations

Security Architecture

1. Network Security

Encryption:

  • WireGuard protocol with ChaCha20 encryption
  • Perfect Forward Secrecy
  • Key rotation and management

Network Segmentation:

  • VPN traffic isolation
  • Firewall rules and network policies
  • Private network routing

Access Control:

  • Certificate-based authentication
  • Multi-factor authentication support
  • Role-based permissions

2. Application Security

API Security:

  • JWT token authentication
  • HTTPS/TLS encryption
  • Input validation and sanitization
  • Rate limiting and DDoS protection

Container Security:

  • Non-root user execution
  • Minimal base images
  • Security scanning and updates
  • Secrets management

3. Infrastructure Security

Cloud Security:

  • VPC/Network isolation
  • Security groups and NACLs
  • Encryption at rest and in transit
  • Identity and access management

Monitoring and Auditing:

  • Comprehensive logging
  • Security event monitoring
  • Compliance reporting
  • Incident response procedures

Deployment Architecture

1. Development Environment

Local Development:

  • Docker Compose for local services
  • Hot reloading for development
  • Local database and Redis
  • Mock external services

Testing:

  • Unit tests for all components
  • Integration tests for API
  • End-to-end tests for VPN functionality
  • Security testing and scanning

2. Staging Environment

Purpose: Pre-production testing and validation.

Features:

  • Production-like infrastructure
  • Automated testing pipeline
  • Performance testing
  • Security scanning

3. Production Environment

High Availability:

  • Multi-zone deployment
  • Load balancing and failover
  • Automated scaling
  • Backup and disaster recovery

Monitoring:

  • Real-time monitoring and alerting
  • Performance metrics and dashboards
  • Log aggregation and analysis
  • Security monitoring

Scalability Considerations

1. Horizontal Scaling

VPN Servers:

  • Multiple WireGuard server instances
  • Load balancing across servers
  • Geographic distribution

API Servers:

  • Multiple API instances
  • Stateless design for easy scaling
  • Database connection pooling

2. Vertical Scaling

Resource Optimization:

  • CPU and memory optimization
  • Network bandwidth optimization
  • Storage performance tuning

3. Auto-scaling

Kubernetes HPA:

  • CPU and memory-based scaling
  • Custom metrics scaling
  • Predictive scaling

Disaster Recovery

1. Backup Strategy

Data Backup:

  • Database backups
  • Configuration backups
  • Key material backups
  • Log retention

Infrastructure Backup:

  • Infrastructure as Code
  • Container image backups
  • Configuration management

2. Recovery Procedures

RTO/RPO Targets:

  • Recovery Time Objective: < 1 hour
  • Recovery Point Objective: < 15 minutes

Recovery Steps:

  1. Infrastructure provisioning
  2. Service deployment
  3. Data restoration
  4. Service validation
  5. Traffic routing

Performance Considerations

1. Network Performance

Optimization:

  • UDP protocol for low latency
  • Kernel-level packet processing
  • Network buffer tuning
  • Connection pooling

2. Application Performance

Optimization:

  • Asynchronous processing
  • Caching strategies
  • Database optimization
  • API response optimization

3. Monitoring and Tuning

Metrics:

  • Latency and throughput
  • Error rates and availability
  • Resource utilization
  • User experience metrics

Compliance and Governance

1. Security Compliance

Standards:

  • SOC 2 Type II
  • ISO 27001
  • GDPR compliance
  • Industry best practices

2. Operational Compliance

Processes:

  • Change management
  • Incident response
  • Security reviews
  • Audit trails

Future Enhancements

1. Planned Features

Advanced Security:

  • Zero-trust architecture
  • Advanced threat detection
  • Behavioral analytics

Performance Improvements:

  • Edge computing integration
  • Advanced caching
  • Protocol optimizations

2. Technology Evolution

Emerging Technologies:

  • 5G network integration
  • IoT device support
  • AI/ML integration
  • Blockchain integration