An Intelligent, Multi-Layer Zero-Trust Web Application Firewall

Architecture • Repositories • Features • Roadmap • Contributing

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About Project NexusWAF

Project NexusWAF is a structured, intelligent Web Application Firewall designed for modern distributed environments.

Built with a strict separation between data plane and control plane, NexusWAF integrates deterministic rule enforcement, formal grammar-based request parsing, and machine learning inference into a cohesive zero-trust security platform.

The system is engineered for:

• High performance
• Structured traffic analysis
• Hot policy reload
• Modular microservice deployment
• Enterprise-grade extensibility

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Core Philosophy

• 🔐 Zero-Trust Request Validation
• 🧠 Deterministic + Intelligent Hybrid Detection
• 🌳 Grammar-Aware Traffic Parsing
• ⚙️ Modular Microservice Architecture
• 🔄 Dynamic Policy Management
• 📊 Observability-First Design

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🚀 Features

🔎 Multi-Layer Detection Pipeline Regex-based lexical filtering Context-Free Grammar (CFG) parsing Abstract Syntax Tree (AST) inspection Semantic rule evaluation ML-powered anomaly scoring Structured payload validation	⚡ High-Performance Data Plane Rust-based reverse proxy Async runtime with Tokio In-memory policy engine Load balancing support Adaptive rate limiting Zero-downtime rule updates
🛡️ Control Plane & Governance JWT-based administrative authentication Versioned rule management Policy rollback capability Audit logging Log querying interface Secure gRPC control channel	🧠 Intelligent Inference Layer ONNX runtime integration Dedicated ML microservice gRPC-based low-latency inference Structured feature extraction Behavioral anomaly detection

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🏗️ Architecture

┌──────────────────────────────────────────────────────────────┐
│                        ADMIN DASHBOARD                       │
│                   (Next.js + TypeScript)                    │
└───────────────────────────┬──────────────────────────────────┘
                            │ REST
                            ▼
┌──────────────────────────────────────────────────────────────┐
│                     CONTROL PLANE API                        │
│                (Rust + Axum + PostgreSQL)                    │
│                                                              │
│  - Rule Management                                           │
│  - Audit Logging                                             │
│  - Configuration Management                                  │
└───────────────────────────┬──────────────────────────────────┘
                            │ gRPC (Control Channel)
                            ▼
┌──────────────────────────────────────────────────────────────┐
│                        DATA PLANE CORE                       │
│                        (Rust Engine)                         │
│                                                              │
│  - Reverse Proxy                                             │
│  - CFG Parser                                                │
│  - AST Analysis                                              │
│  - Rule Engine                                               │
│  - Rate Limiter                                              │
│  - Load Balancer                                             │
└───────────────────────────┬──────────────────────────────────┘
                            │ gRPC (Inference)
                            ▼
┌──────────────────────────────────────────────────────────────┐
│                    ML INFERENCE SERVICE                      │
│               (Python + ONNX Runtime)                        │
└──────────────────────────────────────────────────────────────┘

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📦 Repositories

Repository	Description	Language
nexus-core	High-performance Rust proxy and security engine	Rust
nexus-ml	ONNX-based ML inference microservice	Python
nexus-control-api	Administrative control plane backend	Rust
nexus-dashboard	Web-based admin dashboard	TypeScript
nexus-iac	Infrastructure and container orchestration	Docker / YAML
nexus-docs	Architecture and technical documentation	Markdown

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🛠️ Technology Stack

Layer	Technology	Purpose
Language	Rust	Data plane & control plane
Runtime	Tokio	Async I/O
Protocol	gRPC	Inter-service communication
ML Runtime	ONNX	Model inference
Database	PostgreSQL	Rules & audit storage
Frontend	Next.js	Admin interface
Observability	Prometheus	Metrics

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🔐 Security Model

• Strict internal service boundaries
• In-memory rule updates via secure gRPC
• Versioned configuration control
• Structured logging and audit trail
• mTLS-ready internal communication
• Zero direct dashboard-to-core access

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🗺️ Roadmap

Current Focus

• ✅ Core reverse proxy engine
• ✅ CFG-based parsing layer
• 🚧 Semantic rule engine
• 🚧 ML inference integration
• 🚧 Administrative dashboard
• ⏳ Canary rule deployment
• ⏳ Distributed rule synchronization

Future Enhancements

• Shadow traffic evaluation
• Advanced anomaly scoring models
• Multi-region deployment
• Enterprise SSO integration
• Kubernetes-native deployment tooling

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🤝 Contributing

We welcome contributions from developers, researchers, and security engineers.

Ways to contribute:

• Report issues
• Improve documentation
• Suggest new detection strategies
• Optimize parsing performance
• Expand ML classification models

Development setup instructions are available in individual repository READMEs.

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📜 License

Project NexusWAF is released under the MIT License.

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_{Engineered with precision for structured, intelligent application security.}

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