Append-Only File System Policy Enforcement
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Solution Overview
Problem
Conventional file systems are prone to administrative-level security breaches and inadvertent modifications, compromising the integrity of log files critical for forensic analysis and compliance monitoring, as they fail to protect log files from unauthorized access and tampering.
Innovation Solution
Implementing an append-only policy on specified files, such as log files, that restricts modifications to appending data only, applies uniformly to all user access levels, and uses cryptographic associations to ensure only authorized entities can modify the policy, thereby preventing truncation, renaming, or removal of protected files.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional file systems are used to store log files, then ease of operation and accessibility are improved, but security and integrity protection deteriorate due to susceptibility to administrative-level breaches and unauthorized modifications
Solution Approach 1:
The patent segments the file system into conventional areas and a protected append-only area. Log files are divided between these zones, with critical portions placed in the protected area that enforces strict append-only access controls, preventing unauthorized modifications while maintaining accessibility for legitimate operations.
Solution Approach 2:
The patent introduces an intermediary protected file system layer between the conventional file system and the log files. This intermediary enforces append-only policies, cryptographic verification, and access control mechanisms, acting as a mediator that allows legitimate access while blocking malicious modifications.
2Ease of operation
If administrative-level access is permitted for log file management, then ease of operation is improved, but security deteriorates due to potential administrative breaches and inadvertent modifications
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing append-only policies and cryptographic protections on log files before administrative access is exercised. These pre-configured security measures automatically prevent both intentional breaches and inadvertent modifications by administrators, while still allowing legitimate management operations through controlled interfaces.
3Reliability
If append-only policies are applied to log files, then reliability and integrity are improved, but device complexity increases due to policy enforcement mechanisms
Solution Approach 1:
The patent adds another dimension to the file system architecture by creating a protected append-only area with specialized enforcement mechanisms. This dimensional separation allows complex security policies to be applied only where needed (in the protected area) while leaving the majority of the file system operating with standard simplicity, thus managing complexity through spatial differentiation.
Data Source
AI summary
A computer system associates a given file of a file system with append-only policy that is specified by an owner of given file. The computer system can subsequently intercept file system operations for the file system, including file system operations that specify the given file. The computer system can unconditionally apply the append-only policy to requesting entities, independent of the requesting entities' access level with respect to the file system.