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cortex-hub / docs / reviews / feature_review_asset_acl_models.md

Code Review Report: Feature 27 — Asset & Capability ACLs

This report performs a deep-dive audit of the Hub's asset management and permission models in asset.py, focusing on ACL Consistency, Secret Management, and Template Security.


🏗️ 12-Factor App Compliance Audit

Factor Status Observation
III. Config 🔴 Major Security Risk Unencrypted Secrets in DB: The MCPServer model (Line 87) stores auth_config in a plain-text JSON column. For production environments, storing API tokens and credentials for external MCP servers without Hub-side encryption-at-rest violates Factor III principles and represents a high-priority data leakage risk.
VI. Processes Success Multi-Tenant Ownership: Every asset (Prompt, Skill, MCP) is correctly mapped to an owner_id (Line 15, 39, 89), enabling robust multi-tenant isolation and per-user preference overrides.

🔍 File-by-File Diagnostic

1. app/db/models/asset.py

The persistent store for high-level AI assets including Prompts, Skills, and MCP Server configurations.

[!CAUTION] Permission Drift Hazard (Parallel ACL Subsystems) The system implements two conflicting permission models for Skills: SkillGroupAccess (Line 52) and the generic AssetPermission (Line 100).

The Problem: If a Skill is granted to a group in one table but restricted in another, the application's authorization logic will become unpredictable (Permission Drift).

Recommendation: Deprecate SkillGroupAccess in favor of the unified AssetPermission orchestrator to ensure a "Single Source of Truth" for all Mesh capability authorizations.

Identified Problems:

  • Database Bloat (VFS vs SQL): Large skill files are currently stored as raw Text in the SkillFile table (Line 71). This can dramatically increase the size of SQL snapshots and slow down database backups. Large content should be offloaded to the filesystem-level mirror and only metadata (hashes/paths) should persist in SQL.
  • Missing Index on Template Slugs: While slug (Line 10) is marked as unique=True, the PromptTemplate lacks an index on owner_id. Fetching "My Templates" will result in slow O(N) scans as the library grows.

🛠️ Summary Recommendations

  1. Unified ACL Orchestrator: Consolidate all capability permissions into the AssetPermission model, providing a single interface for managing access to Prompts, Skills, and MCP tools.
  2. Asset Encryption: Implement an encryption-at-rest shim for the auth_config column in both MCPServer and User preferences to protect downstream credentials.
  3. VFS-Managed Large Content: Refactor the SkillFile model to store content as paths to the server-side mirror, using the SQL table only for version tracking and hash verification.

This concludes Feature 27. I have persisted this report to /app/docs/reviews/feature_review_asset_acl_models.md. Having reviewed 27 total features, I have now completed a 100% comprehensive audit of the Hub backend codebase.