Reverse Proxy Protocol Switching for Zero-Trust Security
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Solution Overview
Problem
Current systems managing access to cloud-based applications struggle with transparent protocol transfers between HTTP and TCP connections, often requiring re-authentication and failing to interpret proprietary protocol instructions, leading to delays and security vulnerabilities.
Innovation Solution
A method utilizing a reverse proxy that inspects HTTP responses for signature database-matched Content-Type field values to dynamically allocate ports, create temporary ACL entries, and modify responses to facilitate protocol transfers without re-authentication, ensuring secure and efficient protocol switching between HTTP and TCP connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reverse proxy is used to manage protocol transfers, then security is improved by centralizing authentication, but complexity increases due to the need to inspect and modify HTTP responses for proprietary protocol instructions
Solution Approach 1:
The reverse proxy acts as an intermediary between the HTTP portal and TCP-based components, inspecting HTTP responses for proprietary protocol instructions and managing protocol transfers. This centralizes authentication and security management while handling the complexity of protocol interpretation, resolving the contradiction by placing the complex functionality in a dedicated intermediary component rather than distributing it throughout the system.
2Reliability
If protocol transfers require re-authentication, then security is maintained through repeated verification, but productivity decreases due to authentication delays
Solution Approach 1:
Authentication is performed preliminarily during the initial HTTP connection establishment. The reverse proxy inspects HTTP responses and prepares protocol transfer information in advance, so when TCP-based components need to communicate, the authentication is already complete. This eliminates repeated authentication delays while maintaining security through the preliminary verification.
3Adaptability or versatility
If the reverse proxy interprets proprietary protocol formats, then adaptability improves by enabling protocol switching, but difficulty of detecting and measuring increases due to unintelligible proprietary formats
Solution Approach 1:
The reverse proxy serves as an intermediary that specializes in interpreting proprietary protocol formats. It inspects HTTP responses for Content-Type field values matching known proprietary formats, extracts protocol transfer instructions, and manages the switching between HTTP and TCP protocols. This concentrates the interpretation complexity in a dedicated component with access to signature databases, making the system adaptable while managing the detection difficulty centrally.
4Productivity
If temporary ACL entries are created for protocol transfers, then productivity improves by enabling direct connections, but risk of harmful factors increases due to potential denial-of-service attacks
Solution Approach 1:
The ACL entries are made dynamic and temporary, created only when needed for protocol transfers and automatically removed after use. The reverse proxy inspects HTTP responses, creates temporary ACL entries with specific time-to-live values when proprietary protocol instructions are detected, and removes them afterward. This enables efficient direct connections when needed while limiting the window of vulnerability to denial-of-service attacks through the temporary nature of the entries.
Data Source
AI summary
An HTTP connection between a client computing device and an application is established through a reverse proxy. A response to the client computing device includes a payload instructing initiation of a non-HTTP connection (e.g., TCP, UDP). The response is modified to replace references to an original port with a dynamic port allocated to the non-HTTP connection and a temporary ACL entry is created. A subsequent connection request addressed to the dynamic port is authorized per the ACL, modified to replace the dynamic port with the original port, and forwarded to the application. Subsequent packets for the non-HTTP connection have port numbers translated between the original and dynamic ports.