Secure HTTP/2 Frame Capture via Application Hook
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Solution Overview
Problem
Existing packet capture techniques are inadequate for securely capturing troubleshooting information for HTTP/2 traffic due to its high control traffic volume, which interferes with the ability to distinguish between data and control messages.
Innovation Solution
A method is introduced where a hook within a specific application on a data compute node observes and writes only HTTP information to a capture file, excluding L2-L4 information and payload data, thereby enabling secure frame capture of HTTP/2 traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lightweight packet capture is used to capture data up to L4 header, then security is improved by cutting off payload data, but troubleshooting capability deteriorates for HTTP/2 traffic due to inability to distinguish control messages from data traffic
Solution Approach 1:
The patent segments the packet capture process into two distinct approaches: (1) traditional lightweight capture that stops at L4 header for security, and (2) application-layer hook-based capture that selectively captures HTTP/2 frame information. The hook mechanism separates control message identification from data payload capture, allowing administrators to troubleshoot HTTP/2 specific issues while maintaining security boundaries.
Solution Approach 2:
The patent introduces an intermediary hook mechanism within the application layer that acts as a mediator between the networking stack and the packet capture function. This hook intercepts HTTP/2 frames after L4 processing, identifies control messages versus data messages, and selectively captures only the necessary frame header information without exposing payload data, thus resolving the contradiction between security and troubleshooting capability.
2Ease of operation
If entire network frames are captured by listening on device driver, then complete troubleshooting information is obtained, but security deteriorates due to exposure of payload data and L2-L4 information
Solution Approach 1:
The patent extracts only the essential HTTP/2 frame information (frame type, connection identifier, payload length) from the complete network frame, leaving behind the sensitive L2-L4 headers and payload data. This extraction is performed by the application-layer hook which parses the HTTP/2 frame structure and selectively writes only the necessary diagnostic information to the capture file, thereby maintaining security while providing troubleshooting capability.
Solution Approach 2:
The patent applies local quality by making different parts of the captured data have different levels of detail. The HTTP/2 frame header information is captured in detail for troubleshooting, while the L2-L4 headers and payload data are either omitted or captured at a lower fidelity level. This selective detail distribution allows effective troubleshooting without compromising security-sensitive areas.
3Quantity of substance
If HTTP/2 control traffic is captured along with data traffic, then complete traffic analysis is possible, but measurement precision deteriorates due to inability to distinguish control messages from data messages
Solution Approach 1:
The patent performs preliminary action by having the application-layer hook identify and classify HTTP/2 frames as control messages or data messages before they are processed further. The hook examines the frame type field in the HTTP/2 frame header, determines the message category, and tags or separates this information in the capture output. This preliminary classification enables precise measurement and analysis of control versus data traffic without mixing their characteristics.
Solution Approach 2:
The patent implements feedback by having the hook mechanism continuously monitor incoming HTTP/2 frames, identify their type, and provide this classification information back to the capture process. This feedback loop ensures that each captured frame is properly labeled with its type (control or data), enabling accurate traffic analysis and measurement precision even when capturing large volumes of HTTP/2 traffic.
Data Source
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AI summary
Some embodiments provide a method for performing secure frame capture for an application executing on a data compute node. At the application, the method receives and parses a frame for a particular L7 protocol. The method identifies an action to perform within the application based on the parsed frame. Based on secure frame capture being enabled for the application, the method writes information regarding the frame to a capture file stored at the DCN. The information regarding the frame omits (i) any L2-L4 information and (ii) any payload data carried by the frame.