eBPF SSL/TLS Traffic Inspection Without Keys
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Solution Overview
Problem
Existing techniques for SSL/TLS inspection require access to cryptographic key material or the root certificate authority, making real-time inspection challenging, especially in scenarios like detecting malicious traffic or preventing sensitive data leakage.
Innovation Solution
A computer-implemented system using an extended Berkeley Packet Filter (eBPF) subsystem to extract unencrypted data from SSL/TLS libraries without cryptographic key material, correlating it with network sockets for real-time inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cryptographic key material is extracted from process memory space to enable SSL/TLS inspection, then inspection capability is improved, but system complexity increases and real-time performance deteriorates
Solution Approach 1:
The patent introduces an intermediary component (traffic inspection subsystem with eBPF) that sits between the network traffic and the inspection processes. This intermediary captures encrypted traffic at the kernel level and makes it available for inspection without requiring direct access to cryptographic keys or process memory, thereby reducing system complexity while maintaining inspection capability
Solution Approach 2:
The patent replaces the mechanical approach of extracting keys from process memory with an eBPF-based system that uses kernel-level hooks and tracepoints. This substitution eliminates the need for complex key extraction mechanisms and separate correlation processes, enabling real-time inspection with reduced system complexity
2Adaptability or versatility
If separate processes are used to correlate extracted keys with network traffic, then inspection flexibility is improved, but real-time performance deteriorates
Solution Approach 1:
The patent merges the key correlation function and traffic inspection function into a single integrated eBPF subsystem operating at the kernel level. By combining these functions, the system eliminates the latency introduced by inter-process communication and data correlation between separate processes, achieving real-time performance while maintaining inspection flexibility through programmable eBPF logic
3Measurement precision
If root CA access is required for SSL/TLS inspection, then decryption accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
Instead of requiring access to root CA to decrypt traffic, the patent inverts the approach by using eBPF to hook into SSL/TLS library functions directly. This allows the system to capture plaintext data at the point where it is being encrypted or decrypted by the application, eliminating the need for root CA access while maintaining the ability to inspect encrypted traffic
4Measurement precision
If cryptographic key material is accessed from applications, then inspection accuracy is improved, but security risks increase
Solution Approach 1:
The eBPF subsystem acts as an intermediary that captures traffic at the kernel level without requiring access to application process memory or cryptographic keys. This intermediary approach maintains inspection accuracy by capturing plaintext at the SSL/TLS library level while eliminating security risks associated with accessing sensitive key material in application memory
Data Source
AI summary
A computer-implemented system utilizes a traffic inspection subsystem (e.g., an extended Berkeley Packet Filter (eBPF) subsystem) to extract unencrypted data, before it has been encrypted or after it has been decrypted (e.g., by SSL/TLS), without the need for cryptographic key material from applications or processes. The system extracts the unencrypted data by attaching into the corresponding encryption libraries (e.g., SSL/TLS libraries) and their functions using the traffic inspection subsystem. The extracted unencrypted data is correlated to the corresponding network sockets that the encrypted traffic is using.