SecureLLM Bridge

Zero-Trust Gateway for Large Language Model Orchestration

Enterprise-grade proxy ensuring security, compliance, and observability for generative AI integrators.

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📊 By The Numbers

Metric	Value	Significance
Safety	Strict	100% Rust-based memory safety guarantees
Scale	~5k LOC	Modular Workspace with 5 decoupled crates
Performance	<1ms	Overhead per request (excluding LLM latency)
Compliance	100%	Full audit trail of every input/output token

🚀 Strategic Value

In a fragmented AI ecosystem, direct API consumption creates a chaotic attack surface. SecureLLM Bridge acts as a unified control plane, applying a "Defense-in-Depth" strategy to your AI infrastructure.

• 🛡️ Zero-Trust Architecture: Authentication (mTLS) and Authorization (RBAC) are enforced before any request touches an LLM.
• 🔭 Full Observability: Unlike opaque client libraries, we provider comprehensive telemetry (Tracing, Metrics, Logs) compatible with OpenTelemetry.
• ⚖️ Governance & Compliance: Enforce PII sanitization (Redaction) at the gateway level, ensuring sensitive data never leaves your perimeter.
• 🔌 Vendor Agnostic: Decouples your internal logic from specific providers (OpenAI, DeepSeek, Anthropic), preventing vendor lock-in.

🏗️ Architecture

The system utilizes a Cargo Workspace pattern to enforce separation of concerns between the core data models, security middleware, and provider adapters.

flowchart LR
    Client[Internal Service] -->|mTLS| Gateway[SecureLLM Gateway]

    subgraph Gateway [SecureLLM Bridge]
        Auth[mTLS Auth] --> RateLimit[Rate Limiter]
        RateLimit --> Audit[Audit Logger]
        Audit --> Router{Provider Router}

        Router -->|DeepSeek| DSAdapter[DeepSeek Adapter]
        Router -->|OpenAI| OAAdapter[OpenAI Adapter]
        Router -->|Local| OllamaAdapter[Ollama Adapter]
    end

    DSAdapter -->|HTTPS| DeepSeek[DeepSeek API]
    OAAdapter -->|HTTPS| OpenAI[OpenAI API]
    OllamaAdapter -->|HTTP| Ollama[Local Ollama]

    Audit -.->|Async Write| SQLite[(Audit DB)]

⚡ Technical Stack

• Runtime: Rust (Tokio, Axum, Tower) for predictable latency and memory safety.
• Build System: Nix Flakes for bit-for-bit reproducible development environments.
• Containerization: Docker multi-stage builds optimized for minimal image size (Alpine based).
• Data Consistency: SQLite / Redis for state management and distributed rate limiting.

🛠️ Deployment

Production (Docker)

Designed for Kubernetes sidecar or standalone deployment.

docker run -d \
  -p 3000:3000 \
  -v $(pwd)/config:/app/config \
  -e RUST_LOG=info \
  securellm/bridge

Development (Nix)

Enter a hermetic development shell with all dependencies (Rust, Cargo, OpenSSL, SQLite) pre-configured.

nix develop
cargo run --bin securellm

🛡️ Security Posture

• Audit Logging: Immutable record of all interactions.
• Secret Management: Integration with platform keyrings (Linux/macOS/Windows) via keyring crate.
• Input Sanitization: Regex-based PII redaction pipeline.

🤝 Contributing

Governance model follows standard Open Source best practices. See CONTRIBUTING.md.

📄 License

Dual-licensed under MIT or Apache-2.0 to ensure maximum compatibility with enterprise legal requirements.