Secure LLM Gateway: Enterprise-Grade Secure Access Gateway for Large Language Models

Secure LLM Gateway is an open-source gateway solution focused on secure access to large language models (LLMs). It aims to help enterprises ensure data security and compliance while leveraging LLM capabilities. Its core value lies in addressing security challenges faced by enterprises when using LLMs—such as sensitive data leakage, unauthorized access, and prompt injection attacks—through features like role-based access control (RBAC), prompt injection detection, and PII identification, providing a unified security control layer for LLM access paths.

With the rapid application of LLMs in enterprise scenarios like intelligent customer service and code assistance, security risks are becoming increasingly prominent: employees may inadvertently send sensitive data containing PII to external models; malicious users can bypass security restrictions via prompt injection; lack of unified identity authentication and permission control leads to uncontrolled access. Secure LLM Gateway deploys a security proxy layer within the enterprise to identify and protect against risks before data leaves the enterprise boundary, balancing the release of LLM capabilities with security and compliance requirements.

Role-Based Access Control (RBAC)

Fine-grained control over LLM access permissions for users/departments, including model selection, function restrictions (e.g., file upload), quota management, etc.

Prompt Injection Detection

Built-in three-layer engine: pattern matching to identify known attacks, semantic analysis to judge input intent, context validation to check rationality, which can block requests or trigger alerts.

PII Identification and Desensitization

Identifies sensitive information such as names and ID numbers, supports processing methods like blocking, automatic desensitization, and marked release, adapting to compliance requirements like GDPR and HIPAA.

Performance Optimization

Asynchronous processing, intelligent caching, streaming response support, and connection pool management ensure low latency under high concurrency.

Modular Architecture

• API Gateway Layer: Receives LLM requests and provides RESTful and OpenAI-compatible interfaces
• Security Engine Layer: Executes security policies like RBAC and injection detection
• Policy Management Layer: Manages rules, roles, and audit configurations
• Log Monitoring Layer: Records requests and decisions, providing real-time alerts

Flexible Deployment

Supports standalone deployment, Kubernetes Sidecar mode, and edge deployment, seamlessly integrating with existing technology stacks.

1. Unified Management Across Departments: Configure differentiated policies for the Marketing Department (content creation + file upload prohibition), Finance Department (PII desensitization), and R&D Department (code models + quota restrictions).
2. Third-Party Application Proxy: Act as a proxy for third-party SaaS applications to enhance security control without replacing the application.
3. Development and Testing Sandbox: Configure loose but audited policies for the development environment to balance innovation and security tracking.

Technical Highlights

• Pluggable Security Policies: Supports custom plugin integration with internal systems
• Real-Time Threat Intelligence: Integrates external sources to obtain the latest attack patterns
• Comprehensive Audit Reports: Detailed records of requests and processing results, exportable to SIEM or generating compliance reports

Target Users

Mid-to-large enterprises, regulated industries like finance/healthcare, multi-tenant SaaS providers, and AI application development teams.

Selection Recommendations

• Enterprises with existing API gateways: Evaluate integration solutions to avoid duplicate construction
• Cloud-native architectures: Prioritize the Sidecar deployment mode.

Secure LLM Gateway is a key infrastructure for enterprise AI governance. It allows enterprises to control risks while enjoying the dividends of AI through unified security control. As LLM applications deepen, such security gateways will become standard configurations, and this project provides an excellent open-source reference implementation.