SAR VPN - Technical Specification

1. Overview

SAR VPN is a commercial-grade Virtual Private Network solution designed to provide secure, private, and unrestricted internet access for both individual and enterprise users.

Security First

Military-grade encryption with perfect forward secrecy and rigorous no-logs policy to protect user privacy.

High Performance

Optimized protocols and global server infrastructure ensure minimal latency and maximum throughput.

Cross-Platform

Native clients for all major platforms with consistent feature set and unified management.

Cloud-Native

Containerized microservices architecture with auto-scaling for elastic demand.

2. Feature List

Core Features

Multiple protocol support (WireGuard, OpenVPN, IKEv2/IPsec)
Military-grade encryption (AES-256-GCM, ChaCha20-Poly1305)
Perfect Forward Secrecy (PFS) with ephemeral keys
Strict no-logs policy with GDPR compliance
Kill switch (network lockdown on VPN failure)

Client Features

Server selection with geolocation & ping tests
Favorite servers and auto-connect
Split tunneling for selective app routing
Obfuscation/stealth modes for restricted networks
P2P-friendly servers with port forwarding

Server Features

Automatic load balancing across PoPs
Auto-scaling based on demand
Health checks and automatic failover
Geographically distributed Points of Presence
Optional mesh/VPN peering for enterprise

3. Security Architecture

Cryptography

Encryption Algorithms

AES-256-GCM (default)

ChaCha20-Poly1305

Key Exchange

ECDH (X25519)

Perfect Forward Secrecy

Authentication Methods

Standard Users

Username/Password (PBKDF2-HMAC-SHA256)
OTP/MFA (TOTP via Google Authenticator)

Enterprise Users

Certificate-based (X.509)
OAuth/SAML 2.0 Integration

Security Checklist

Item	Status
No hardcoded credentials	Implemented
Secure key storage (HSM/TEE)	Implemented
Certificate pinning	Implemented
Memory-safe implementations	Partial
Annual third-party audits	Planned

4. Tunneling Protocols

Modern Protocols

WireGuard

State-of-the-art VPN protocol using modern cryptography with minimal attack surface. Default choice for performance and security.

Ports: UDP/51820
Crypto: ChaCha20, Poly1305, BLAKE2s

OpenVPN

Mature, highly configurable protocol with strong community support. Recommended when TCP connectivity is required.

Ports: TCP/443, UDP/1194
Crypto: AES-256-GCM, TLS 1.3

IKEv2/IPsec

Standardized protocol with excellent mobile support and NAT traversal capabilities. Ideal for unreliable networks.

Ports: UDP/500, UDP/4500
Crypto: AES-256, SHA-384, DH Group 20

Legacy Protocols (Not Recommended)

L2TP/IPsec

Older protocol with known vulnerabilities. Only provided for compatibility with legacy systems.

Ports: UDP/1701
Crypto: 3DES, SHA-1

SSTP

Microsoft proprietary protocol with limited auditing. Only supported on Windows platforms.

Ports: TCP/443
Crypto: SSL 3.0/TLS 1.2

PPTP

Completely broken protocol with multiple cryptographic weaknesses. Disabled by default.

Ports: TCP/1723
Crypto: MS-CHAPv2 (broken)

Warning: Legacy protocols are provided only for backward compatibility and should be avoided for any security-sensitive applications.

5. Client Features

Connection Management

Server Selection

Interactive world map with geolocation
Ping tests and latency indicators
Server load percentages
Specialty servers (P2P, streaming, etc.)

Protocol Selection

Automatic (smart protocol selection)
Manual protocol override
Port customization
Protocol-specific settings

Auto-Connect

On app launch
When joining untrusted networks
Custom rules based on network SSID
Fallback server selection

Privacy Protection

Kill switch (network lockdown)
DNS leak protection
IPv6 leak protection
WebRTC leak protection

Advanced Features

Split Tunneling

Route only specific apps or destinations through VPN:

Application-based rules
IP/CIDR-based rules
Domain-based rules (via DNS)
Inverse mode (VPN-exception list)

Obfuscation

Stealth modes to bypass VPN blocking:

Obfsproxy integration
Stunnel for TLS wrapping
Shadowsocks proxy
Domain fronting (where available)

Platform-Specific Features

Platform	Key Features	Limitations
Windows	TAP driver installation Full split tunneling System tray integration	Requires admin for TAP driver
macOS	Network Extension Menu bar widget Touch ID authentication	Split tunneling limited
Linux	CLI and GUI options Systemd integration NetworkManager plugin	Distro-specific packaging
Android	Always-on VPN Per-app rules Notification controls	Background restrictions
iOS	NEVPNManager integration Widget support Local network permission	No split tunneling

6. Server Infrastructure

Network Architecture

Cloud Topology

Multi-region deployment across major cloud providers
Bare metal servers for high-throughput locations
Anycast DNS for optimal routing
Private backbone between PoPs

Server Specifications

Dedicated CPU cores for crypto operations
10Gbps+ network interfaces
RAM-optimized instances (8GB+ per server)
NVMe storage for logging/metadata

Simplified Network Diagram

Technical Implementation

Containerization

Docker containers for all services
Kubernetes orchestration
Immutable infrastructure pattern
CI/CD pipelines with GitOps

Monitoring & Metrics

Prometheus for metrics collection
Grafana dashboards for visualization
ELK stack for log aggregation
AlertManager for notifications

Deployment Strategy

1

Infrastructure as Code

Terraform modules for provisioning cloud resources across multiple providers with consistent configuration.

2

Automated Deployment

GitHub Actions workflows that build, test, and deploy container images to staging and production environments.

3

Configuration Management

Ansible playbooks for server configuration and WireGuard key distribution with Vault integration.

4

Security Hardening

Automated CIS benchmark compliance checks and runtime security monitoring with Falco.

7. Deployment Plan

Phased Rollout

Phase 1: Core Infrastructure (4 weeks)

Setup Kubernetes clusters in 3 regions
Deploy control plane services
Implement monitoring and logging
Basic WireGuard server deployment

Phase 2: Feature Completion (6 weeks)

Add OpenVPN and IKEv2 support
Implement load balancing and auto-scaling
Deploy management dashboard
Client application integration

Phase 3: Optimization (2 weeks)

Performance tuning and benchmarking
Security audit and penetration testing
Documentation finalization
Internal training

Phase 4: Production Launch (1 week)

Gradual traffic migration
24/7 monitoring setup
Support team onboarding
Marketing launch

Resource Requirements

Role	Count	Duration	Skills
DevOps Engineer	2 FTE	Full project	K8s, Terraform, Ansible
Backend Developer	3 FTE	Phases 1-3	Go, Python, VPN protocols
Frontend Developer	2 FTE	Phases 2-3	React, Electron
Security Engineer	1 FTE	Phases 1,3	Cryptography, Pentesting
QA Engineer	1 FTE	Phases 2-4	Automated testing

Cost Estimates

Infrastructure

Cloud Compute $8,000/mo
Bandwidth $12,000/mo
Storage $1,500/mo
Total $21,500/mo

Software

Licenses $5,000 one-time
Monitoring $800/mo
Security Tools $1,200/mo
Total $7,000 initial

Personnel

Engineering $120,000/mo
Operations $30,000/mo
Support $15,000/mo
Total $165,000/mo

8. API Documentation

REST API Endpoints

Endpoint	Method	Description
/api/v1/servers	GET	List available VPN servers with status
/api/v1/connect	POST	Initiate VPN connection
/api/v1/disconnect	POST	Terminate active VPN connection
/api/v1/status	GET	Get current connection status
/api/v1/config	GET	Download VPN configuration

Example Requests

Python Example

import requests

# Authenticate
auth = ("username", "password")

# Get server list
servers = requests.get("https://api.sarvpn.com/api/v1/servers", 
                      auth=auth).json()

# Connect to best server
best_server = min(servers, key=lambda s: s['load'])
response = requests.post("https://api.sarvpn.com/api/v1/connect",
                        json={"server_id": best_server['id']},
                        auth=auth)

if response.status_code == 200:
    print("Connected successfully!")
else:
    print("Connection failed:", response.json())

Node.js Example

const axios = require('axios');

async function connectVPN() {
  try {
    // Configure auth
    const auth = {
      username: 'your_username',
      password: 'your_password'
    };

    // Get server status
    const { data: servers } = await axios.get(
      'https://api.sarvpn.com/api/v1/servers',
      { auth }
    );

    // Find fastest server
    const fastest = servers.reduce((prev, curr) => 
      prev.ping < curr.ping ? prev : curr
    );

    // Connect
    await axios.post(
      'https://api.sarvpn.com/api/v1/connect',
      { server_id: fastest.id },
      { auth }
    );

    console.log('VPN connection established');
  } catch (error) {
    console.error('VPN error:', error.response?.data || error.message);
  }
}

Response Schema

Server Object

{
  "id": "wg-us-east-1a",
  "hostname": "us-east.vpn.sarvpn.com",
  "ip_address": "192.0.2.45",
  "location": {
    "country": "US",
    "city": "New York",
    "latitude": 40.7128,
    "longitude": -74.0060
  },
  "protocols": ["wireguard", "openvpn"],
  "load": 0.65,
  "ping": 28,
  "features": ["p2p", "streaming"]
}

Connection Status

{
  "connected": true,
  "since": "2023-07-15T14:32:18Z",
  "server_id": "wg-us-east-1a",
  "protocol": "wireguard",
  "bytes_up": 12547896,
  "bytes_down": 45328710,
  "duration": 1254
}

9. MVP Roadmap

Development Timeline

Q1: Core Infrastructure (12 weeks)

1

WireGuard Implementation

Weeks 1-4

Basic WireGuard server deployment with key management

2

Control Plane

Weeks 5-8

User authentication, server management, and API development

3

Windows Client

Weeks 9-12

Basic Windows client with connection management

Q2: Feature Expansion (12 weeks)

4

Additional Protocols

Weeks 1-4

OpenVPN and IKEv2/IPsec support

5

Mobile Clients

Weeks 5-8

Android and iOS app development

6

Advanced Features

Weeks 9-12

Kill switch, split tunneling, and obfuscation

Q3: Launch Preparation (8 weeks)

7

Beta Testing

Weeks 1-4

Closed beta with selected users

8

Launch Preparation

Weeks 5-8

Documentation, marketing materials, support training

Success Metrics

Technical

99.9% server uptime
<100ms average latency
Zero critical security issues

Business

10,000 MAU within 3 months
5% conversion rate from free trial
<15% monthly churn rate

Operational

<1 hour resolution for critical issues
24/7 monitoring coverage
Monthly security audits