Shared SID/UID/GID Mapping for Cross-Node File Access
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Solution Overview
Problem
In data management systems, inconsistencies in Windows security identifier (SID) to Unix user identifier (UID) or group identifier (GID) mappings across nodes in a cluster lead to access control issues, where unauthorized users may gain access or authorized users may be denied access due to differing mappings.
Innovation Solution
Implement a shared repository for maintaining a global SID/UID/GID mapping accessible to all nodes in the cluster, enabling Samba servers to retrieve consistent mappings from this central database instead of maintaining local mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each node maintains local SID/UID/GID mappings, then each node can independently manage access control, but mapping inconsistencies occur across nodes leading to access control failures
Solution Approach 1:
The patent merges the SID/UID/GID mapping functionality from individual node-level Samba servers into a centralized shared repository. This allows all nodes to access a common, consistent mapping database, eliminating the mapping inconsistencies that occur when each node maintains its own local mappings. The shared repository ensures that all nodes use the same mapping rules, thereby resolving the access control consistency issue.
Solution Approach 2:
The shared repository acts as an intermediary between the Samba servers on different nodes and the local file systems. Instead of each node independently resolving SID/UID/GID mappings, the intermediary shared repository provides a centralized service that returns consistent mappings to all nodes, ensuring uniform access control behavior across the entire cluster.
2Reliability
If a centralized shared repository is used for SID/UID/GID mappings, then access control consistency is improved, but additional storage and network resources are required
Solution Approach 1:
The shared repository is designed to serve multiple functions: it stores SID/UID/GID mappings, provides consistent access control information to all nodes, and can be queried by any Samba server in the cluster. By making the mapping service universal and shared, the system avoids the need for duplicate mapping databases on each node, thereby minimizing the additional storage requirements despite the centralized approach.
Data Source
AI summary
Methods, systems, and devices for data management are described. A server hosted by a storage node within a cluster of a data management system (DMS) may receive a request to access a file stored in a distributed file system. The request may be associated with a security identifier (SID). The server may transmit an indication of the SID to a shared repository accessible to the cluster. Accordingly, the server may receive an indication of a mapping between the SID and one or both of a user identifier (UID) or a group identifier (GID) associated with the SID. The server may transmit an indication of the file and the UID/GID to the distributed file system, which may compare the UID/GID to a list of authorized identifiers for the file. If the UID/GID is on the list of authorized identifiers, the distributed file system may execute the request accordingly.