Proxy-Less SSL Inspection Appliance for Scalable TCP Flow Control
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Solution Overview
Problem
Existing network systems require clients to be configured with proxy IP addresses for secure connections, leading to scalability issues and difficulties with non-HTTP protocols, and conventional proxy-based solutions complicate TCP flow control and retransmission.
Innovation Solution
A proxy-less SSL inspection appliance intercepts client requests, generates a new certificate, decrypts and inspects data, and re-encrypts it without self-scheduling retransmissions, using client or server-side packet retransmission logic to maintain transparent and scalable secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proxy is used for SSL connections, then secure data inspection is enabled, but device complexity and scalability deteriorate due to full TCP flow control logic being implemented on the inspecting device
Solution Approach 1:
The patent extracts the SSL inspection function from the traditional proxy architecture by implementing SSL termination at the network appliance level. The appliance intercepts SSL traffic, decrypts it, inspects the clear text, and re-encrypts it for forwarding to the actual server. This extraction eliminates the need for the appliance to implement full TCP flow control logic while maintaining secure inspection capabilities.
Solution Approach 2:
The network appliance serves as an intermediary between the client and the server, but unlike a traditional proxy, it operates at the network layer rather than implementing full TCP session management. The appliance mediates SSL termination and inspection without burdening itself with complex TCP flow control responsibilities.
2Reliability
If a proxy is used for SSL connections, then data inspection capability is provided, but scalability deteriorates due to sockets not scaling well for large number of connections
Solution Approach 1:
The patent replaces the traditional socket-based proxy architecture with a network appliance that operates at the network layer. This substitution eliminates the scalability limitations of socket-based connections by using packet-switched network communication instead of connection-oriented socket management, allowing the appliance to handle large numbers of concurrent connections efficiently.
3Reliability
If a proxy is used for SSL connections, then secure inspection is achieved, but ease of operation deteriorates due to client browser needing to be configured with proxy IP address
Solution Approach 1:
The network appliance performs self-service by automatically intercepting and inspecting SSL traffic without requiring client configuration. The appliance monitors network traffic, identifies SSL connections, and performs inspection autonomously, eliminating the need for clients to be configured with proxy IP addresses while maintaining secure inspection.
4Reliability
If a proxy is used for SSL connections, then certificate inspection is enabled, but adaptability deteriorates due to difficulty in configuring for non-HTTP protocols
Solution Approach 1:
The network appliance provides universal SSL inspection capability across multiple protocols by operating at the network layer rather than being protocol-specific. The appliance can inspect SSL traffic for various protocols (HTTP, FTP, SMTP, etc.) using the same inspection mechanism, eliminating the need for separate configuration for each protocol while maintaining comprehensive certificate inspection.
Data Source
AI summary
Some embodiments of proxy-less Secure Sockets Layer (SSL) data inspection have been presented. In one embodiment, a secured connection according to a secured network protocol between a client and a responder is setup via a gateway device, which is coupled between the client and the responder. The gateway device transparently intercepts data transmitted according to the secured network protocol between the client and the responder. Furthermore, the gateway device provides flow-control and retransmission of one or more data packets of the data without self-scheduling the packet retransmissions using timeouts and based on the packet retransmission logic of either the client-side or the responder side of the connection. The gateway device is further operable to perform security screening on the data.