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man pages section 8: System Administration Commands

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Updated: Wednesday, July 27, 2022

vfs_acl_xattr (8)


vfs_acl_xattr - ACLs in Extended Attributes (EAs)


vfs objects = acl_xattr


System Administration tools                                   VFS_ACL_XATTR(8)

       vfs_acl_xattr - Save NTFS-ACLs in Extended Attributes (EAs)

       vfs objects = acl_xattr

       This VFS module is part of the samba(7) suite.

       The vfs_acl_xattr VFS module stores NTFS Access Control Lists (ACLs) in
       Extended Attributes (EAs). This enables the full mapping of Windows
       ACLs on Samba servers.

       The ACLs are stored in the Extended Attribute security.NTACL of a file
       or directory. This Attribute is not listed by getfattr -d filename. To
       show the current value, the name of the EA must be specified (e.g.
       getfattr -n security.NTACL filename).

       This module forces the following parameters:

              o   inherit acls = true

              o   dos filemode = true

              o   force unknown acl user = true

       This module is stackable.

       acl_xattr:ignore system acls = [yes|no]
           When set 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
           that Samba keeps setting and evaluating both the system ACLs and
           the NT ACLs. This is better if you need your system ACLs be set for
           local or NFS file access, too. If you only access the data via
           Samba you might set this to yes to achieve better NT ACL

           If acl_xattr:ignore system acls is set to yes, the following
           additional settings will be enforced:

                  o   create mask = 0666

                  o   directory mask = 0777

                  o   map archive = no

                  o   map hidden = no

                  o   map readonly = no

                  o   map system = no

                  o   store dos attributes = yes

       acl_xattr:default acl style = [posix|windows|everyone]
           This parameter determines the type of ACL that is synthesized in
           case a file or directory lacks an security.NTACL xattr.

           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 will full rights.

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

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

           The default for this option is posix.

       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.

       See attributes(7) for descriptions of the following attributes:

       |Availability   | service/network/samba |
       |Stability      | Volatile              |

       Source code for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-

       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from

       Further information about this software can be found on the open source
       community website at http://www.samba.org/.

Samba 4.13.17                     06/28/2022                  VFS_ACL_XATTR(8)