1VFS_ACL_XATTR(8) System Administration tools VFS_ACL_XATTR(8)
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6 vfs_acl_xattr - Save NTFS-ACLs in Extended Attributes (EAs)
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9 vfs objects = acl_xattr
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12 This VFS module is part of the samba(7) suite.
13 The vfs_acl_xattr VFS module stores NTFS Access Control Lists (ACLs) in
15 Extended Attributes (EAs). This enables the full mapping of Windows
16 ACLs on Samba servers.
17 The ACLs are stored in the Extended Attribute security.NTACL of a file
19 or directory. This Attribute is not listed by getfattr -d filename. To
20 show the current value, the name of the EA must be specified (e.g.
21 getfattr -n security.NTACL filename).
22 This module forces the following parameters:
24 • inherit acls = true
26 • dos filemode = true
28 • force unknown acl user = true
30 This module is stackable.
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35 acl_xattr:security_acl_name = NAME
36 This option allows to redefine the default location for the NTACL
37 extended attribute (xattr). If not set, NTACL xattrs are written to
38 security.NTACL which is a protected location, which means the
39 content of the security.NTACL attribute is not accessible from
40 normal users outside of Samba. When this option is set to use a
41 user-defined value, e.g. user.NTACL then any user can potentially
42 access and overwrite this information. The module prevents access
43 to this xattr over SMB, but the xattr may still be accessed by
44 other means (eg local access, SSH, NFS). This option must only be
45 used when this consequence is clearly understood and when specific
46 precautions are taken to avoid compromising the ACL content.
47 acl_xattr:ignore system acls = [yes|no]
49 When set to yes, a best effort mapping from/to the POSIX ACL layer
50 will not be done by this module. The default is no, which means
51 that Samba keeps setting and evaluating both the system ACLs and
52 the NT ACLs. This is better if you need your system ACLs be set for
53 local or NFS file access, too. If you only access the data via
54 Samba you might set this to yes to achieve better NT ACL
55 compatibility.
56 If acl_xattr:ignore system acls is set to yes, the following
58 additional settings will be enforced:
59 • create mask = 0666
61 • directory mask = 0777
63 • map archive = no
65 • map hidden = no
67 • map readonly = no
69 • map system = no
71 • store dos attributes = yes
73 acl_xattr:default acl style = [posix|windows|everyone]
76 This parameter determines the type of ACL that is synthesized in
77 case a file or directory lacks an security.NTACL xattr.
78 When set to posix, an ACL will be synthesized based on the POSIX
80 mode permissions for user, group and others, with an additional ACE
81 for NT Authority\SYSTEM will full rights.
82 When set to windows, an ACL is synthesized the same way Windows
84 does it, only including permissions for the owner and NT
85 Authority\SYSTEM.
86 When set to everyone, an ACL is synthesized giving full permissions
88 to everyone (S-1-1-0).
89 The default for this option is posix.
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93 The original Samba software and related utilities were created by
94 Andrew Tridgell. Samba is now developed by the Samba Team as an Open
95 Source project similar to the way the Linux kernel is developed.
96Samba 4.17.5 01/26/2023 VFS_ACL_XATTR(8)