VFS_ACL_TDB(8)

✨ NAME ✨

vfs_acl_tdb — bestie, this one saves your NTFS-ACLs into a tdb file 💾💖

🌸 SYNOPSIS 🌸

vfs objects = acl_tdb

🦋 DESCRIPTION 🦋

Okay so first thing: this VFS module is part of the samba(7) suite, so it's already running with the squad. 🫶

The vfs_acl_tdb VFS module stores NTFS Access Control Lists (ACLs) in a tdb file. That's literally the whole point, and it's giving full mapping of Windows ACLs on Samba servers. Iconic, honestly.

The ACL settings live at $LOCKDIR/file_ntacls.tdb — that's where the magic sits. ✨

This module forces the following parameters, no arguing, no negotiating:

• inherit acls = true
• dos filemode = true
• force unknown acl user = true

And yes, this module is stackable. Stack her up, she plays nice. 🎀

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💅 OPTIONS 💅

• acl_tdb:ignore system acls = [yes|no] — When you set this to yes, a best effort mapping from/to the POSIX ACL layer will not be done by this module. The default is no, which means Samba keeps setting and evaluating both the system ACLs and the NT ACLs. That default is the move if you need your system ACLs to be set for local or NFS file access too. But if you only access the data via Samba? You might set this to yes to achieve better NT ACL compatibility. 👑

If acl_tdb:ignore system acls is set to yes, these additional settings get enforced:

• create mask = 0666
• directory mask = 0777
• map archive = no
• map hidden = no
• map readonly = no
• map system = no
• store dos attributes = yes

• acl_tdb:default acl style = [posix|windows|everyone] — This parameter determines the type of ACL that gets synthesized in case a file or directory lacks a security.NTACL xattr. Like, no xattr? We make one up. 💫

When set to posix, an ACL will be synthesized based on the POSIX mode permissions for user, group and others, with an additional ACE for NT Authority\SYSTEM with full rights.

When set to windows, an ACL is synthesized the same way Windows does it, only including permissions for the owner and NT Authority\SYSTEM.

When set to everyone, an ACL is synthesized giving full permissions to everyone (S-1-1-0). Everybody eats. 🍓

The default for this option is posix. So if you didn't pick, you got posix, periodt.

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👑 AUTHOR 👑

The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed. Respect the founders fr fr. 🙌

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Okay that's the whole page bestie, go forth and ACL responsibly. This was Samba 4.24.7-Ubuntu-4.24.7+dfs, dated 09/13/2026 — love u, mwah 💜