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docs: add NexusGuard portfolio (architecture, tech-stack, features, deployment)

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docs/portfolio/README.md
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# NexusGuard SD-WAN Suite
> Enterprise Zero-Trust SD-WAN with WireGuard
NexusGuard is a production-grade, zero-trust SD-WAN solution built with Go, Vue 3, and WireGuard. It enables stealth VPN tunneling, centralized IPAM, and real-time network isolation via Linux `nftables` — all managed through a futuristic glassmorphism dashboard.
## Key Highlights
- **Zero-Attack Surface** — No public registration. Admin accounts created via CLI only.
- **Stealth Agent** — WireGuard config injected into memory. No files written to `/etc/wireguard/`.
- **Real-time Firewall** — Per-peer nftables rules synced to kernel instantly.
- **Cross-Platform** — Agent runs on Linux (daemon), Windows (tray + service), and macOS (tray).
## Tech Stack
`Go` · `Vue 3` · `WireGuard` · `PostgreSQL` · `Redis` · `nftables` · `gRPC` · `Docker`
## Architecture
```
┌──────────────┐ ┌─────────────────┐ ┌──────────────┐
│ Dashboard │──HTTP──▶│ Server Core │◀─WG────▶│ Device Agent │
│ (Vue 3) │ :8080 │ (Go/Gin) │ :51820 │ (Go) │
└──────────────┘ │ │ └──────────────┘
│ Port 8080: │ │
│ - HTTP API │ ┌────┴────┐
│ - gRPC Signal │ │ TUN (wg)│
│ (cmux) │ │ Memory │
└─────────────────┘ └─────────┘
```
## Documentation
| Document | Description |
|----------|-------------|
| [Architecture](architecture.md) | System architecture, data flow, security model |
| [Tech Stack](tech-stack.md) | Technology breakdown per component |
| [Features](features.md) | Feature showcase and capabilities |
| [Deployment](deployment.md) | Deployment guide (Docker, native, development) |
## Quick Start
```bash
git clone https://git.datadunia.com/nexusguard/Nexus-Guard-Suite.git
cd Nexus-Guard-Suite
./setup.sh
bash update.sh
```
## License
Private — DataDunia
docs/portfolio/architecture.md
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# Architecture Overview
NexusGuard is a three-component SD-WAN system: a central API server, a web dashboard, and cross-platform device agents. All communication is encrypted. Tunnels are fileless. Access is zero-trust.
## High-Level Architecture
```
┌─────────────────────────────────────────────────────────────────────┐
│ Dashboard (Vue 3) │
│ Glassmorphism Web Interface │
│ Manages: Nodes, Devices, Rules │
└───────────────────────────────────┬─────────────────────────────────┘
│ HTTP (port 80)
▼
┌─────────────────────────────────────────────────────────────────────┐
│ Nginx Reverse Proxy │
│ Routes: /api/ → :8080, / → SPA │
└───────────────────────────────────┬─────────────────────────────────┘
│
▼
┌─────────────────────────────────────────────────────────────────────┐
│ Server Core (Go/Gin) │
│ │
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────────────┐ │
│ │ HTTP API │ │ gRPC │ │ IPAM │ │ nftables │ │
│ │ (20+ │ │ Signaling│ │ Manager │ │ Firewall │ │
│ │ handlers)│ │ (cmux) │ │ │ │ │ │
│ └────┬─────┘ └────┬─────┘ └────┬─────┘ └────────┬─────────┘ │
│ │ │ │ │ │
│ ▼ ▼ ▼ ▼ │
│ ┌─────────────────────────────────────────────────────────────┐ │
│ │ PostgreSQL Database │ │
│ │ (wg_servers, devices, rules, users) │ │
│ └─────────────────────────────────────────────────────────────┘ │
│ │
│ ┌──────────────────────┐ ┌──────────────────────┐ │
│ │ Redis │ │ WireGuard │ │
│ │ (Heartbeat TTL) │ │ (wg0 interface) │ │
│ └──────────────────────┘ └──────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘
│
┌───────────────┴───────────────┐
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Device Agent (Linux) │ │ Device Agent (Win/Mac) │
│ Systemd Daemon │ │ System Tray │
│ Memory-injected WG │ │ Memory-injected WG │
└───────────────────────────┘ └───────────────────────────┘
```
## Component Breakdown
### Server Core
The central API and VPN hub. Written in Go with Gin framework.
| Responsibility | Implementation |
|----------------|----------------|
| API endpoints | 20+ Gin handlers (`api/` directory) |
| gRPC signaling | Bidirectional streaming via cmux (port 8080) |
| IPAM | IP pool allocation from CIDR per node |
| Firewall | nftables rule management (add/remove per peer) |
| WireGuard | Interface control, peer sync, config push |
| Auth | JWT middleware, admin-only enforcement |
| Heartbeat | Config sync, handshake monitoring |
### Dashboard UI
Admin web interface. Built with Vue 3 and glassmorphism design system.
| Responsibility | Implementation |
|----------------|----------------|
| Node management | Register/edit WireGuard servers |
| Device management | CRUD, provisioning tokens, QR codes |
| Firewall rules | Per-peer nftables rule editor |
| Live telemetry | 10s polling for device health |
| Traffic history | Time-range filtering, export |
### Device Agent
Stealth VPN daemon. Cross-platform Go binary.
| Responsibility | Implementation |
|----------------|----------------|
| Provisioning | HTTP POST with AES-256-GCM encrypted response |
| Tunnel | Memory-injected WireGuard (no disk files) |
| Heartbeat | HTTP/gRPC, config sync, handshake monitoring |
| gRPC | Bidirectional stream for real-time commands |
| Self-healing | Exponential backoff reconnection |
## Data Flow
### Provisioning Flow
```
1. Admin creates device via Dashboard → API generates registration token
2. Agent sends token + HWID to POST /api/v1/provision
3. Server validates token, allocates IP from pool
4. Server responds with WireGuard config (AES-256-GCM encrypted)
5. Agent decrypts config, injects into WireGuard via IpcSet
6. Tunnel established — no files written to disk
```
### Heartbeat Flow
```
Every 30 seconds:
1. Agent reads last_handshake_time from WireGuard IPC
2. Agent computes config_hash = endpoint + internalIP + serverPub
3. Agent POSTs {config_hash, last_handshake, tunnel_up} to server
4. Server compares with stored config
5. If config changed → server responds with new config
6. Agent detects change → rebuilds tunnel
```
### Suspend/Resume Flow
```
Suspend:
1. Admin clicks "Suspend" in Dashboard
2. Dashboard POSTs /api/v1/devices/:id/suspend
3. Server updates DB (is_suspended = true)
4. Server sends gRPC SuspendCommand to agent
5. Server removes WireGuard peer from kernel
6. Agent receives command → stops tunnel
Resume:
1. Admin clicks "Resume" in Dashboard
2. Server updates DB (is_suspended = false)
3. Server re-adds WireGuard peer to kernel
4. Server sends gRPC ResumeCommand with full ConfigUpdate
5. Agent receives command → rebuilds tunnel
```
## Security Model
### Zero-Trust Principles
| Principle | Implementation |
|-----------|----------------|
| No public registration | `/auth/register` locked; admin via CLI only |
| Encrypted provisioning | AES-256-GCM for WireGuard config transfer |
| Fileless tunnels | WireGuard config in process memory only |
| Hardware binding | HWID (DMI/CPU serial) bound to registration token |
| Per-peer isolation | nftables rules per device, default deny |
| JWT authentication | All API endpoints require valid token |
### Trust Boundaries
```
┌─────────────────────────────────────────────────────────┐
│ Trusted Zone │
│ │
│ ┌──────────┐ ┌──────────┐ ┌──────────────────────┐ │
│ │ Server │ │ Database │ │ WireGuard Interface │ │
│ │ Core │ │ (PG) │ │ (wg0) │ │
│ └──────────┘ └──────────┘ └──────────────────────┘ │
│ │
└─────────────────────────────────────────────────────────┘
│
Encrypted Channel
(AES-256-GCM / WG)
│
┌─────────────────────────────────────────────────────────┐
│ Untrusted Zone │
│ │
│ ┌──────────────────────────────────────────────────┐ │
│ │ Device Agent │ │
│ │ (Memory-only WireGuard config) │ │
│ └──────────────────────────────────────────────────┘ │
│ │
└─────────────────────────────────────────────────────────┘
```
## Port Multiplexing
Server Core uses cmux to serve both HTTP and gRPC on port 8080:
```go
m := cmux.New(lis)
grpcLis := m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings(
"content-type", "application/grpc",
))
httpLis := m.Match(cmux.Any())
```
- gRPC matched by `content-type: application/grpc` header
- HTTP matched by `Any()` (catch-all)
- Single port, single listener, zero extra config
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# Deployment Guide
NexusGuard supports three deployment modes: Docker (recommended), native install, and development.
## Docker Deployment (Recommended)
### Prerequisites
- Docker 20.10+
- Docker Compose v2
- Git
### Quick Start
```bash
# Clone repository
git clone https://git.datadunia.com/nexusguard/Nexus-Guard-Suite.git
cd Nexus-Guard-Suite
# Generate .env file
./setup.sh
# Edit configuration
nano .env
# Start all services
bash update.sh
```
### First Boot
On first run, the system automatically:
1. Pulls latest code and builds Docker containers
2. Generates Local Primary Node WireGuard keys
3. Creates database schema via migration
### Configuration
Edit `.env` in root directory:
```bash
# Database
DB_HOST=postgres
DB_PORT=5432
DB_USER=nexusguard
DB_PASSWORD=your_secure_password
DB_NAME=nexusguard
# Redis
REDIS_ADDR=redis:6379
# Security (auto-generated by setup.sh)
JWT_SECRET=<hex-64-chars>
SERVER_SALT=<hex-64-chars>
# Network
NFTABLES_TABLE=nexusguard
IPAM_POOL=10.8.0.0/16
# Server
GIN_MODE=release
PORT=8080
# Dashboard
VITE_API_BASE_URL=https://api.yourdomain.com/api/v1
```
### Update Commands
```bash
bash update.sh # Smart update (rebuild only if changes)
bash update.sh --force # Force rebuild
bash update.sh --backup # Backup PostgreSQL before update
bash update.sh --no-migrate # Skip database migration
```
### Makefile Commands
| Command | Description |
|---------|-------------|
| `make up` | Start all services |
| `make down` | Stop all services |
| `make logs` | Tail all service logs |
| `make dev` | Start with hot-reload |
| `make migrate` | Run database migration |
| `make reset-db` | Reset database to initial state |
### Create Admin Account
```bash
docker exec -it nexus-guard-suite-server-core-1 ./server-core \
-create-admin -user admin -pass "YourSecurePassword123!"
```
### Service Architecture
```
┌─────────────────────────────────────────────────┐
│ Docker Compose │
│ │
│ ┌──────────┐ ┌──────────┐ ┌──────────────┐ │
│ │ nginx │ │ server- │ │ postgres │ │
│ │ :80/:443 │→ │ core │→ │ :5432 │ │
│ │ │ │ :8080 │ │ │ │
│ └──────────┘ └──────────┘ └──────────────┘ │
│ ↑ ↑ │
│ ┌──────────┐ ┌──────────┐ │
│ │ dashboard│ │ redis │ │
│ │ (static) │ │ :6379 │ │
│ └──────────┘ └──────────┘ │
└─────────────────────────────────────────────────┘
```
### Port Mapping
| Service | Container Port | Host Port |
|---------|----------------|-----------|
| nginx | 80 | 80 |
| nginx | 443 | 443 |
| server-core | 8080 | 8080 |
| postgres | 5432 | 5432 |
| redis | 6379 | 6379 |
### Volumes
| Volume | Purpose |
|--------|---------|
| `postgres_data` | PostgreSQL data persistence |
| `redis_data` | Redis data persistence |
---
## Native Install
For production servers without Docker.
### Prerequisites
**Debian/Ubuntu:**
```bash
sudo apt install -y golang nginx postgresql redis-server nftables wireguard-tools
```
**CentOS/Rocky:**
```bash
sudo dnf install -y golang nginx postgresql-server redis nftables wireguard-tools
```
### Build Binaries
**Server Core:**
```bash
cd apps/server-core
CGO_ENABLED=0 go build -o ../../bin/server-core .
cd ../..
```
**Dashboard UI:**
```bash
cd apps/dashboard-ui
npm install
VITE_API_BASE_URL=/api/v1 npm run build
cd ../..
```
### Run Installer
```bash
sudo bash nexusguard-install.sh
```
**Options:**
```bash
sudo bash nexusguard-install.sh --server-port 8080 --web-port 80
sudo bash nexusguard-install.sh --db-host 127.0.0.1 --db-pass mypassword
```
**What the installer does:**
1. Creates PostgreSQL database and user
2. Installs binary to `/usr/local/bin/nexusguard-server`
3. Installs dashboard to `/usr/share/nexusguard/dashboard/`
4. Creates config at `/etc/nexusguard/nexusguard.conf`
5. Runs database migration
6. Creates systemd service
7. Configures nginx
### Create Admin Account
```bash
sudo /usr/local/bin/nexusguard-server \
-create-admin -user admin -pass "YourSecurePassword123!"
```
### Service Management
```bash
# Start
sudo systemctl start nexusguard-server
# Stop
sudo systemctl stop nexusguard-server
# Status
sudo systemctl status nexusguard-server
# Logs
sudo journalctl -u nexusguard-server -f
```
### Configuration
Edit `/etc/nexusguard/nexusguard.conf`:
```bash
# Database
DB_HOST=127.0.0.1
DB_PORT=5432
DB_USER=nexusguard
DB_PASSWORD=nexusguard
DB_NAME=nexusguard
# Redis
REDIS_ADDR=127.0.0.1:6379
# Security (auto-generated)
JWT_SECRET=<hex-64-chars>
SERVER_SALT=<hex-64-chars>
# Network
NFTABLES_TABLE=nexusguard
IPAM_POOL=10.8.0.0/16
# Server
GIN_MODE=release
PORT=8080
```
### Uninstall
```bash
# Remove files only
sudo bash nexusguard-uninstall.sh
# Also drop database
sudo bash nexusguard-uninstall.sh --remove-db
```
---
## Development Mode
For local development with hot-reload.
### Prerequisites
- Go 1.25+
- Node.js 24+
- PostgreSQL
- Redis
### Setup Database
1. Create PostgreSQL database:
```sql
CREATE DATABASE nexusguard;
CREATE USER nexusguard WITH PASSWORD 'nexusguard';
GRANT ALL PRIVILEGES ON DATABASE nexusguard TO nexusguard;
```
2. Copy environment template:
```bash
cp .env.example .env
```
3. Edit `.env` with your database credentials.
### Start Backend
```bash
cd apps/server-core
go mod download
go run -tags dev .
```
The `-tags dev` flag:
- Runs AutoMigrate on startup
- Provisions local node
- Enables debug logging
### Start Frontend
```bash
cd apps/dashboard-ui
npm install
npm run dev
```
Dashboard available at `http://localhost:5173`.
### Create Admin Account
```bash
cd apps/server-core
go run -tags dev . -create-admin -user admin -pass "YourNewSecurePassword123!"
```
### Development Workflow
```
┌─────────────────────────────────────────────────────────┐
│ Development Setup │
│ │
│ Terminal 1: Backend │
│ ┌───────────────────────────────────────────────────┐ │
│ │ $ go run -tags dev . │ │
│ │ [dev] AutoMigrate complete │ │
│ │ [dev] Local node provisioned │ │
│ │ [gin] Listening on :8080 │ │
│ └───────────────────────────────────────────────────┘ │
│ │
│ Terminal 2: Frontend │
│ ┌───────────────────────────────────────────────────┐ │
│ │ $ npm run dev │ │
│ │ │ │
│ │ VITE v8.0.0 ready in 300 ms │ │
│ │ │ │
│ │ ➜ Local: http://localhost:5173/ │ │
│ └───────────────────────────────────────────────────┘ │
│ │
│ Browser: http://localhost:5173 │
│ → Dashboard UI (Vue 3 + Vite) │
│ → API calls proxied to :8080 │
└─────────────────────────────────────────────────────────┘
```
---
## Agent Installation
### Linux (Automated)
```bash
# Transfer script
scp scripts/install_agent.sh user@target-machine:~
# Run installer
sudo ./install_agent.sh \
--server-url "https://api.yourdomain.com" \
--token "REG_TOKEN_FROM_DASHBOARD"
# Verify
sudo systemctl status sys-bridge.service
```
**Options:**
- `--binary-name "my-agent"` — Override default binary name
**What the script does:**
1. Detects OS (APT/YUM)
2. Installs dependencies (iproute2, curl)
3. Downloads correct binary for architecture
4. Creates config at `~/.config/nexusguard/nexusguard.conf`
5. Creates systemd service
6. Starts agent
### Linux (Manual)
```bash
# Download binary
sudo cp nexusguard-device-agent-linux-amd64 /usr/local/bin/sys-bridge
sudo chmod +x /usr/local/bin/sys-bridge
# Create config
mkdir -p ~/.config/nexusguard
cat > ~/.config/nexusguard/nexusguard.conf <<EOF
SERVER_URL=https://api.yourdomain.com
REG_TOKEN=YOUR_REG_TOKEN
EOF
# Create systemd service
sudo tee /etc/systemd/system/sys-bridge.service > /dev/null <<EOF
[Unit]
Description=NexusGuard Device Agent
After=network.target
[Service]
Type=simple
ExecStart=/usr/local/bin/sys-bridge
Restart=always
RestartSec=5
StandardOutput=journal
StandardError=journal
[Install]
WantedBy=multi-user.target
EOF
# Start
sudo systemctl daemon-reload
sudo systemctl enable --now sys-bridge.service
```
### Windows
1. Build GUI binary:
```bash
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build \
-ldflags="-s -w -H windowsgui" \
-o nexusguard-device-agent-gui.exe .
```
2. Place `wintun.dll` next to executable
3. Run agent — config auto-created at `%APPDATA%\NexusGuard\nexusguard.conf`
4. Edit config with `SERVER_URL` and `REG_TOKEN`
5. Right-click tray icon → Connect
**Service Management:**
- Install as Service — Register Windows service
- Uninstall Service — Remove Windows service
- Start on Boot — Toggle auto-start
### Docker
```bash
docker build -t nexus-device-agent .
docker run -d \
--name nexus-agent \
--restart unless-stopped \
--network host \
--cap-add NET_ADMIN \
--cap-add NET_RAW \
-e SERVER_URL=https://api.yourdomain.com \
-e REG_TOKEN=YOUR_REG_TOKEN \
nexus-device-agent
```
**Required capabilities:**
- `NET_ADMIN` — Network interface configuration
- `NET_RAW` — Raw socket access (WireGuard)
---
## Troubleshooting
### Common Issues
| Issue | Cause | Solution |
|-------|-------|----------|
| Agent fails to start | Missing config | Check config file has `SERVER_URL` + `REG_TOKEN` |
| Provisioning fails | Invalid token | Generate new token from Dashboard |
| Tunnel won't create | Missing kernel module | `sudo modprobe wireguard` |
| `ip addr add` fails | Permissions | Run as root or grant `CAP_NET_ADMIN` |
| Heartbeat timeout | Network issue | `curl -I <SERVER_URL>` |
### Log Locations
| Platform | Location |
|----------|----------|
| Docker | `docker logs -f nexus-guard-suite-server-core-1` |
| Native | `sudo journalctl -u nexusguard-server -f` |
| Agent (Linux) | `~/.local/share/nexusguard/logs/` |
| Agent (Windows) | `%APPDATA%\NexusGuard\logs\` |
| Agent (macOS) | `~/Library/Logs/NexusGuard/` |
### Debug Commands
```bash
# Check WireGuard interface
sudo wg show
# Test server connectivity
curl -I https://api.yourdomain.com/api/health
# Check agent version
/usr/local/bin/sys-bridge -version
# Run agent in foreground
sudo /usr/local/bin/sys-bridge -debug
```
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# Features
NexusGuard provides enterprise-grade SD-WAN capabilities with a focus on security, automation, and ease of use.
## Zero-Trust Security
### No Public Registration
The `/auth/register` endpoint is locked. Admin accounts can only be created via CLI:
```bash
# Docker
docker exec -it nexus-guard-suite-server-core-1 ./server-core \
-create-admin -user admin -pass "SecurePassword123!"
# Native
sudo /usr/local/bin/nexusguard-server \
-create-admin -user admin -pass "SecurePassword123!"
```
**Why?** Eliminates the attack surface of open registration. No bots, no brute force, no unauthorized accounts.
### Encrypted Provisioning
Agent provisioning uses AES-256-GCM encryption:
1. Agent sends registration token + hardware ID (HWID)
2. Server generates WireGuard config
3. Config encrypted with AES-256-GCM before transmission
4. Agent decrypts in memory, never touches disk
**Why?** WireGuard keys are sensitive. Encryption in transit prevents interception even on compromised networks.
### Memory-Injected Tunnels
WireGuard configuration is injected directly into the kernel via `IpcSet`:
```
Traditional: Config file → /etc/wireguard/wg0.conf → wg-quick up wg0
NexusGuard: Config bytes → IpcSet() → Tunnel active (no files)
```
**Benefits:**
- No config files to steal
- No lingering configs after disconnect
- Multiple agents can run without conflicts
- Clean uninstall = kill process
### Hardware ID Binding
Each agent is bound to its hardware via HWID:
- **Linux:** `/sys/class/dmi/id/product_uuid` or CPU serial
- **Windows:** DMI product UUID
- **macOS:** IOPlatformSerialNumber
HWID is included in provisioning request. Server validates before issuing config.
## Multi-Node Support
### Geographic Scaling
Deploy WireGuard servers across multiple regions:
```
Node 1 (Singapore): 10.172.21.0/24
Node 2 (Frankfurt): 10.172.22.0/24
Node 3 (Virginia): 10.172.23.0/24
```
Each node has its own:
- IP pool (CIDR)
- Interface address
- Peer defaults (DNS, MTU, Keepalive)
- Endpoint (IP/Domain + Port)
### Centralized IPAM
IP Address Management is centralized in the database:
1. Admin defines IP pool per node (e.g., `10.172.21.0/24`)
2. When device is created, server allocates next available IP
3. IP is reserved in database (no duplicates)
4. IP is released when device is deleted
**Why?** Prevents IP conflicts across nodes. Enables static IP assignment for critical devices.
### Per-Node Defaults
Each node can have different peer defaults:
| Setting | Node 1 (SG) | Node 2 (DE) |
|---------|-------------|-------------|
| DNS | `1.1.1.1` | `8.8.8.8` |
| MTU | 1420 | 1280 |
| Keepalive | 25s | 0s |
| AllowedIPs | `10.172.21.0/24` | `0.0.0.0/0` |
Devices inherit from their node, with per-device overrides available.
## Real-Time Firewall
### nftables Integration
NexusGuard manages Linux nftables directly:
```bash
# What NexusGuard creates in the kernel
table ip nexusguard {
set peers_v4 {
type ipv4_addr
elements = { 10.172.21.2, 10.172.21.3, ... }
}
chain forward {
type filter hook forward priority 0; policy accept;
ip daddr @peers_v4 accept
ip saddr @peers_v4 accept
drop
}
}
```
### Per-Peer Rules
Each device can have custom firewall rules:
- **Allow/Block IP ranges** — `192.168.1.0/24`, `10.0.0.1`
- **Port filtering** — TCP/UDP port ranges
- **Direction control** — Inbound, outbound, or both
Changes are synced to kernel instantly — no restart required.
### Default SSH Provisioning
New peers automatically get SSH access (port 22):
```go
// Automatically added on peer creation
AddFirewallRule(peerIP, "0.0.0.0/0", 22, "tcp", "allow")
```
**Why?** Ensures remote access isn't accidentally locked out.
## Cross-Platform Agent
### Linux — Systemd Daemon
```bash
# Automated install
sudo ./install_agent.sh \
--server-url "https://api.yourdomain.com" \
--token "REG_TOKEN"
# Verify
sudo systemctl status sys-bridge.service
```
Features:
- Runs as root (required for WireGuard)
- Auto-restart on failure
- Journal logging
- Config at `~/.config/nexusguard/nexusguard.conf`
### Windows — System Tray + Service
System tray application with service management:
| Menu Item | Action |
|-----------|--------|
| Status | Shows Connected/Disconnected |
| IP | Shows internal VPN IP |
| Connect | Start tunnel |
| Disconnect | Stop tunnel |
| Install as Service | Register Windows service |
| Start on Boot | Toggle auto-start |
### macOS — System Tray
System tray application (no service support):
- Config at `~/Library/Application Support/NexusGuard/nexusguard.conf`
- Logs at `~/Library/Logs/NexusGuard/`
### Self-Healing
All platforms implement exponential backoff:
```
Failure 1: Wait 30s, retry
Failure 2: Wait 60s, retry
Failure 3: Wait 120s, retry
...
Failure N: Wait 300s (max), retry
```
Network drops are handled gracefully — tunnel stays alive, agent reconnects in background.
## Dashboard
### Glassmorphism Design
Futuristic UI with glass-like transparency:
- Backdrop blur effects
- Semi-transparent panels
- Gradient accents
- Smooth animations
### Live Telemetry
Device health polled every 10 seconds:
```
┌─────────────────────────────────────────┐
│ Device: server-01 │
│ Status: ● Online │
│ IP: 10.172.21.2 │
│ Last Handshake: 15s ago │
│ Uptime: 3d 14h 22m │
└─────────────────────────────────────────┘
```
### QR Code Setup
Generate QR codes for mobile WireGuard clients:
1. Create device in Dashboard
2. Click "Show QR Code"
3. Scan with WireGuard app on iOS/Android
4. Tunnel ready — no manual config
### Share Links
Time-limited config sharing:
1. Click "Generate Share Link"
2. Set expiration (1h, 24h, 7d)
3. Share URL with recipient
4. Recipient downloads `.conf` file
5. Link expires automatically
## Deployment Flexibility
### Docker (Recommended)
```bash
git clone https://git.datadunia.com/nexusguard/Nexus-Guard-Suite.git
cd Nexus-Guard-Suite
./setup.sh
bash update.sh
```
One command to start everything. Auto-migration on first boot.
### Native Install
For servers without Docker:
```bash
sudo bash nexusguard-install.sh
```
Creates systemd service, nginx config, PostgreSQL database.
### Development Mode
Hot-reload for both backend and frontend:
```bash
# Terminal 1: Backend
cd apps/server-core
go run -tags dev .
# Terminal 2: Frontend
cd apps/dashboard-ui
npm run dev
```
Auto-migration on startup. No Docker required.
## Comparison
| Feature | NexusGuard | Traditional VPN | Commercial SD-WAN |
|---------|------------|-----------------|-------------------|
| Zero-trust | ✅ | ❌ | ✅ |
| Fileless tunnel | ✅ | ❌ | ❌ |
| Multi-platform agent | ✅ | Partial | ✅ |
| Real-time firewall | ✅ | ❌ | ✅ |
| Self-hosted | ✅ | ✅ | ❌ |
| Open source | ✅ | ✅ | ❌ |
| Cost | Free | Free | $$$$ |
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# Technology Stack
NexusGuard uses a modern, production-grade technology stack. Each component is built with tools optimized for its domain.
## Backend — Server Core
| Technology | Version | Purpose |
|------------|---------|---------|
| Go | 1.25+ | Primary language |
| Gin | 1.12 | HTTP framework |
| GORM | 1.31 | ORM (PostgreSQL) |
| grpc-go | latest | gRPC signaling |
| cmux | latest | Port multiplexing (HTTP + gRPC on :8080) |
| go-redis | 9.x | Heartbeat TTL cache |
| google/nftables | 0.3 | Linux firewall management |
| wgctrl | latest | WireGuard interface control |
| JWT v5 | latest | Authentication tokens |
### Why Go?
- **Static binaries** — No runtime dependencies, easy deployment
- **Concurrency** — Goroutines for handling 10000+ concurrent agent connections
- **WireGuard ecosystem** — Native Go WireGuard libraries (wgctrl, wireguard-go)
- **Performance** — Low memory footprint, fast cold start
### Why cmux?
Single port for HTTP and gRPC eliminates:
- Firewall rules for multiple ports
- Load balancer complexity
- Docker port mapping overhead
## Frontend — Dashboard UI
| Technology | Version | Purpose |
|------------|---------|---------|
| Vue | 3.5 | UI framework (Composition API) |
| Vite | 8 | Build tool + dev server |
| TypeScript | 6.0 | Type safety |
| TailwindCSS | 4.3 | Styling (glassmorphism design system) |
| Pinia | 2.3 | State management |
| Axios | 1.16 | HTTP client |
| HeadlessUI | 1.7 | Accessible UI primitives |
| Iconify | 5.0 | Icon system |
| VueUse | 14.3 | Composition utilities |
### Why Vue 3?
- **Composition API** — Better TypeScript support, reusable logic via composables
- **`<script setup>`** — Cleaner SFC syntax, less boilerplate
- **Ecosystem** — Mature ecosystem with Pinia, Vue Router, VueUse
### Why TailwindCSS 4?
- **Design tokens** — `@theme` block for consistent colors, spacing, typography
- **Glassmorphism** — Utility classes for backdrop-blur, transparency, gradients
- **No PostCSS** — Uses `@tailwindcss/vite` plugin (faster builds)
## Client — Device Agent
| Technology | Version | Purpose |
|------------|---------|---------|
| Go | 1.25+ | Primary language |
| wireguard-go | latest | Userspace WireGuard |
| fyne.io/systray | latest | Cross-platform system tray |
| wintun | latest | Windows WireGuard driver |
### Cross-Compile Targets
| Platform | Architecture | Binary |
|----------|--------------|--------|
| Linux | amd64 | `nexusguard-device-agent-linux-amd64` |
| Linux | arm64 | `nexusguard-device-agent-linux-arm64` |
| Linux | arm | `nexusguard-device-agent-linux-arm` |
| Windows | amd64 | `nexusguard-device-agent-gui.exe` |
| macOS | arm64 | `nexusguard-device-agent-darwin-arm64` |
| macOS | amd64 | `nexusguard-device-agent-darwin-amd64` |
### Why Memory-Injected Tunnels?
Traditional WireGuard setups write config to `/etc/wireguard/`. NexusGuard avoids this:
1. **Security** — No config files on disk = no file theft risk
2. **Stealth** — Tunnel exists only in process memory
3. **Cleanup** — Process exit = tunnel gone (no lingering configs)
4. **Multi-tenant** — Multiple agents can run without config conflicts
## Infrastructure
| Technology | Purpose |
|------------|---------|
| PostgreSQL | Primary database (wg_servers, devices, rules, users) |
| Redis | Heartbeat TTL cache, session tracking |
| nginx | Reverse proxy, SPA fallback, API routing |
| Docker | Container orchestration |
| docker-compose | Multi-service deployment |
### Why PostgreSQL?
- **ACID compliance** — Critical for IPAM allocation (no duplicate IPs)
- **JSON support** — Flexible config storage
- **Maturity** — Battle-tested for production workloads
### Why Redis?
- **Heartbeat TTL** — Fast expiry checks for agent health
- **Session cache** — gRPC session tracking
- **Pub/Sub** — Real-time event distribution (future)
## Build & CI
| Tool | Purpose |
|------|---------|
| Go build | Static binary compilation |
| Vite build | SPA bundling (vue-tsc + vite) |
| Gitea Actions | CI/CD per submodule |
| Makefile | Quick commands (up, down, dev, migrate) |
### Build Flags
```bash
# Server Core (production)
CGO_ENABLED=0 go build -o server-core .
# Device Agent (stripped)
go build -ldflags="-s -w" -o device-agent .
# Dashboard UI
VITE_API_BASE_URL=/api/v1 npm run build
```
- `CGO_ENABLED=0` — Static binary, no CGO dependencies
- `-ldflags="-s -w"` — Strip debug symbols (~30% smaller binary)
- `VITE_API_BASE_URL` — Build-time API endpoint injection
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# NexusGuard Portfolio Design Spec
**Date:** 2026-06-21
**Status:** Draft
**Author:** Sisyphus
## Overview
Create a comprehensive technical portfolio for the NexusGuard SD-WAN Suite project, showcasing architecture, technology stack, features, and deployment options. Target audience: technical recruiters, potential clients, and fellow developers.
## Goals
1. Present NexusGuard as a production-grade enterprise SD-WAN solution
2. Highlight unique selling points (zero-trust, stealth agent, memory-injected tunnels)
3. Provide clear architecture overview for technical audience
4. Document technology choices and reasoning
5. Showcase deployment flexibility (Docker, native, development)
## Scope
### In Scope
- Multi-file Markdown portfolio in `docs/portfolio/`
- 5 files: README, architecture, tech-stack, features, deployment
- ASCII/text-based diagrams (no external dependencies)
- Internal navigation links between files
- Focus on technical depth over marketing fluff
### Out of Scope
- Interactive VitePress integration (future enhancement)
- Screenshots/demo embeds (requires running instances)
- Video content
- Multi-language support (Indonesian/English)
## Design Decisions
### File Structure
```
docs/portfolio/
├── README.md # Landing page / entry point
├── architecture.md # System architecture + diagrams
├── tech-stack.md # Technology breakdown per component
├── features.md # Feature showcase
└── deployment.md # Deployment guide
```
### Diagram Style
Use ASCII/text-based diagrams for portability and version control friendliness. Examples:
```
┌──────────────┐ ┌─────────────────┐ ┌──────────────┐
│ Dashboard │──HTTP──▶│ Server Core │◀─WG────▶│ Device Agent │
│ (Vue 3) │ :8080 │ (Go/Gin) │ :51820 │ (Go) │
└──────────────┘ └─────────────────┘ └──────────────┘
```
### Content Tone
Technical and precise. Avoid marketing buzzwords. Focus on:
- What it does (functional description)
- How it works (architecture/implementation)
- Why these choices (technology rationale)
## File Specifications
### 1. README.md (Landing Page)
**Purpose:** Quick overview, entry point to other sections
**Content:**
- Project name + tagline: "Enterprise Zero-Trust SD-WAN with WireGuard"
- 2-3 sentence description
- Key highlights (3-4 bullet points):
- Zero-attack surface (no public registration)
- Stealth agent (memory-injected, no disk files)
- Real-time nftables isolation
- Cross-platform (Linux, Windows, macOS)
- Tech badges: Go, Vue 3, WireGuard, PostgreSQL, Docker
- Navigation links to other portfolio files
**Length:** ~100 lines
### 2. architecture.md (System Architecture)
**Purpose:** Technical deep-dive into system design
**Content:**
- High-level architecture diagram (ASCII)
- Component breakdown:
- Server Core: API, gRPC signaling, IPAM, firewall, WireGuard management
- Dashboard UI: Management interface, glassmorphism design
- Device Agent: Stealth daemon, multi-platform, self-healing
- Data flow:
- Provisioning flow (HTTP → AES-256-GCM → memory injection)
- Heartbeat flow (HTTP/gRPC, config sync, handshake monitoring)
- Suspend/Resume flow (gRPC command → tunnel control)
- Security model:
- Zero-trust (admin CLI only, no public register)
- Encrypted provisioning (AES-256-GCM)
- Fileless tunnels (WireGuard config in RAM)
- Hardware binding (HWID detection)
**Length:** ~250 lines
### 3. tech-stack.md (Technology Breakdown)
**Purpose:** Detailed technology choices per component
**Content:**
- Backend (Server Core):
- Go 1.25+, Gin framework, GORM ORM
- PostgreSQL, Redis
- grpc-go + cmux (port multiplexing)
- nftables (google/nftables), WireGuard (wgctrl)
- Frontend (Dashboard UI):
- Vue 3.5 (Composition API, `<script setup>`)
- Vite 8, TypeScript 6.0
- TailwindCSS 4.3 (glassmorphism design system)
- Pinia 2.3, Axios 1.16, HeadlessUI 1.7
- Client (Device Agent):
- Go 1.25+, fyne.io/systray
- WireGuard (memory-injected via IpcSet)
- Cross-compile targets: linux/amd64, arm64, arm; windows/amd64; darwin/arm64, amd64
- Infrastructure:
- PostgreSQL, Redis, nginx
- Docker + docker-compose
- Gitea Actions (CI/CD)
**Length:** ~200 lines
### 4. features.md (Feature Showcase)
**Purpose:** Highlight key capabilities
**Content:**
- Zero-Trust Security:
- No public registration (admin CLI only)
- AES-256-GCM encrypted provisioning
- Memory-injected WireGuard (no /etc/wireguard/ files)
- Hardware ID binding (HWID)
- Multi-Node Support:
- Geographic scaling (multiple WG servers)
- Centralized IPAM (IP pool allocation per node)
- Per-node peer defaults
- Real-time Firewall:
- nftables integration (Linux kernel)
- Per-peer rules (IP/CIDR + port ranges)
- Instant sync to kernel (no restart)
- Cross-Platform Agent:
- Linux (systemd daemon)
- Windows (system tray + service)
- macOS (system tray)
- Self-healing (exponential backoff reconnection)
- Dashboard:
- Futuristic glassmorphism UI
- Live telemetry (10s polling)
- QR code for mobile setup
- Time-limited share links
- Deployment Flexibility:
- Docker (recommended)
- Native install (systemd + nginx)
- Development mode (hot-reload)
**Length:** ~200 lines
### 5. deployment.md (Deployment Guide)
**Purpose:** Practical deployment instructions
**Content:**
- Docker (Recommended):
- Quick start (setup.sh + update.sh)
- Configuration (.env)
- Makefile commands (up, down, logs, dev, migrate, reset-db)
- Native Install:
- Prerequisites (Go, Node.js, PostgreSQL, Redis, nginx, nftables, wireguard-tools)
- Build binaries
- Run installer (nexusguard-install.sh)
- Create admin account
- Development:
- Local setup (database + .env)
- Hot-reload (go run -tags dev, npm run dev)
- Database migration
- Agent Installation:
- Linux (automated install_agent.sh)
- Windows (manual + service setup)
- Docker container
**Length:** ~250 lines
## Success Criteria
1. All 5 files created in `docs/portfolio/`
2. Each file is self-contained (can be read independently)
3. Internal links work between files
4. ASCII diagrams render correctly in Markdown viewers
5. Content is accurate and matches actual codebase
6. No broken links or references
## Implementation Notes
- Use existing README content as base (avoid duplication)
- Extract key information from AGENTS.md files
- Verify technical details against actual code
- Keep diagrams simple and readable
- Use consistent Markdown formatting across all files