Advanced authentication and authorization for MCP Gateway

This blog post discusses advanced authentication and authorization techniques used in the MCP Gateway, an Envoy-based solution that aggregates multiple Model Context Protocol (MCP) servers. It addresses critical security challenges such as overly permissive access tokens, lack of user-specific visibility into tools, and heterogeneous authentication methods. The post outlines three key solutions: identity-based tool filtering, OAuth2 token exchange, and HashiCorp Vault integration, all aimed at enhancing security while maintaining flexible integration with various systems. The author provides technical implementation details and a real-world example, showcasing how these solutions ensure secure tool access for AI agents.