|VFS_ACL_XATTR(8)||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.
This module is made for systems which do not support standardized NFS4 ACLs but only a deprecated POSIX ACL draft implementation. This is usually the case on Linux systems. Systems that do support just use NFSv4 ACLs directly instead of this module. Such support is usually provided by the filesystem VFS module specific to the underlying filesystem that supports NFS4 ACLs
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 even if the ACL implementation is not capable of doing so.
The NT ACLs are stored in the security.NTACL extended attribute of files and directories in a form containing the Windows SID representing the users and groups in the ACL. This is different from the uid and gids stored in local filesystem ACLs and the mapping from users and groups to Windows SIDs must be consistent in order to maintain the meaning of the stored NT ACL That extended attribute is not listed by the Linux command 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:
This module is stackable.
acl_xattr:security_acl_name = NAME
acl_xattr:ignore system acls = [yes|no]
If acl_xattr:ignore system acls is set to yes, the following additional settings will be enforced:
acl_xattr:default acl style = [posix|windows|everyone]
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 Authority\SYSTEM.
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.