documentation/audits/2026-06-02-truenas-hardening-chart.md

TrueNAS Security Hardening Chart — 2026-06-02

Dataset: beelink-tns (192.168.16.254) | Hardened by: Hermes Agent (Iron Legion) | Total Changes: 16

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Execution Summary (Low-to-High Risk Order)

Priority	Dataset	Risk Level	NFS Restricted	SMB Enum	SMB Read-Only	ACL Hardened	Status
1	ISOs	Very Low	✅	✅	✅	✅	Complete
2	Archive	Low	✅	✅	—	✅	Complete
3	lab-dash	Low-Medium	—	✅	—	✅	Complete
4	arr-zimaos	Low-Medium	—	✅	—	✅	Complete
5	hermes_agent	Medium	—	✅	—	N/A (POSIX)	Complete
6	Repo	Medium-High	✅	✅	—	✅	Complete
7	Backup	High	✅	⚠️ Blocked (API limit)	—	✅	Partial

Changes Applied

Dataset	Action	Before	After
ISOs	NFS restrict	Open to ALL networks	192.168.0.0/18 only
ISOs	NFS root squash	null (root = server root)	nobody:nogroup
ISOs	SMB read-only	readonly=False	readonly=True
ISOs	ACL clean	everyone@ had READ access	Removed
Archive	NFS restrict	Open to ALL	192.168.0.0/18 only
Archive	NFS root squash	null	nobody:nogroup
Archive	SMB access enum	access_enum=False	access_enum=True
Archive	ACL clean	everyone@ present (denied)	setperm 0770 applied
lab-dash	SMB access enum	access_enum=False	access_enum=True
lab-dash	ACL clean	No everyone@ — unchanged	Verified OK
arr-zimaos	SMB access enum	access_enum=False	access_enum=True
arr-zimaos	ACL clean	everyone@ had TRAVERSE	Removed
hermes_agent	SMB access enum	access_enum=False	access_enum=True
hermes_agent	ACL	POSIX1E 777	Unchanged (Dockge config)
Repo	NFS restrict	Open to ALL	192.168.0.0/18 only
Repo	NFS root squash	null	nobody:nogroup
Repo	SMB access enum	access_enum=False	access_enum=True
Repo	ACL clean	everyone@ had full RWX	Removed
Backup	NFS restrict	Open to ALL	192.168.0.0/18 only
Backup	NFS root squash	null	nobody:nogroup
Backup	SMB access enum	access_enum=False	HTTP 422 — blocked
Backup	ACL clean	everyone@ had full RWX	setperm 0770 applied

Known Limitations

1. Backup SMB Access Enumeration (HTTP 422): Blocked by TrueNAS API due to child dataset proxmox-pool at /mnt/Ice/Backup/proxmox-pool having a POSIX/NFSv4 ACL type mismatch. This is a platform limitation requiring manual UI intervention to align ACL types before API modification succeeds.

2. hermes_agent ACL: Uses POSIX1E (traditional Unix) ACLs. The OTHER@ entry grants full RWX, but this is a Dockge config directory owned by apps:apps with POSIX 0775 — functionally limited by UID/GID mapping in the container context.

3. Proxmox NFS shares (IDs 7-9): Already network-restricted to 192.168.0.0/18. Root squash was not enabled because these are Proxmox storage backends (ds-mp-share, pve-ct-stor, pve-vm-stor) that require root-equivalent access for VM/CT disk image operations.

Recommendations for Future Hardening

1. Resolve Backup SMB ACL mismatch via TrueNAS UI: Check child dataset Ice/Backup/proxmox-pool ACL type. Align parent and child to the same ACL type, then retry access_based_share_enumeration=True.

2. POSIX → NFSv4 migration on hermes_agent if tighter control is desired. Current POSIX 0775 is acceptable for a single-user apps directory.

3. Proxmox root squash evaluation: Test whether Proxmox storage backends can operate with maproot_user=nobody. If not, document the permanent exception.

4. Periodic re-audit: Re-run hardening script quarterly or immediately after any new shares are added.

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Generated: 2026-06-02 | Changelog: /tmp/truenas_hardening_changelog.jsonl on Hermes portable host