smbcacls - Set or get ACLs on an NT file or directory names
smbcacls //server/share filename [ -U username ] [ -A acls ] [ -M
acls ] [ -D acls ] [ -S acls ] [ -C name ] [ -G name ] [ -n ] [
This tool is part of the Samba suite.
The smbcacls program manipulates NT Access Control Lists (ACLs) on SMB
The following options are available to the smbcacls program. The for-
mat of ACLs is described in the section ACL FORMAT
Add the ACLs specified to the ACL list. Existing access control
entries are unchanged.
Modify the mask value (permissions) for the ACLs specified on
the command line. An error will be printed for each ACL speci-
fied that was not already present in the ACL list
Delete any ACLs specified on the command line. An error will be
printed for each ACL specified that was not already present in
the ACL list.
This command sets the ACLs on the file with only the ones speci-
fied on the command line. All other ACLs are erased. Note that
the ACL specified must contain at least a revision, type, owner
and group for the call to succeed.
Specifies a username used to connect to the specified service.
The username may be of the form "username" in which case the
user is prompted to enter in a password and the workgroup speci-
fied in the smb.conf file is used, or "username%password" or
"DOMAIN\username%password" and the password and workgroup names
are used as provided.
The owner of a file or directory can be changed to the name
given using the -C option. The name can be a sid in the form
S-1-x-y-z or a name resolved against the server specified in the
This command is a shortcut for -M OWNER:name.
The group owner of a file or directory can be changed to the
name given using the -G option. The name can be a sid in the
form S-1-x-y-z or a name resolved against the server specified n
the first argument.
This command is a shortcut for -M GROUP:name.
-n This option displays all ACL information in numeric format. The
default is to convert SIDs to names and ACE types and masks to a
readable string format.
-h Print usage information on the smbcacls program.
The format of an ACL is one or more ACL entries separated by either
commas or newlines. An ACL entry is one of the following:
OWNER:<sid or name>
GROUP:<sid or name>
ACL:<sid or name>:<type>/<flags>/<mask>
The revision of the ACL specifies the internal Windows NT ACL revision
for the security descriptor. If not specified it defaults to 1. Using
values other than 1 may cause strange behaviour.
The owner and group specify the owner and group sids for the object. If
a SID in the format CWS-1-x-y-z is specified this is used, otherwise
the name specified is resolved using the server on which the file or
ACLs specify permissions granted to the SID. This SID again can be
specified in CWS-1-x-y-z format or as a name in which case it is
resolved against the server on which the file or directory resides. The
type, flags and mask values determine the type of access granted to the
The type can be either 0 or 1 corresponding to ALLOWED or DENIED access
to the SID. The flags values are generally zero for file ACLs and
either 9 or 2 for directory ACLs. Some common flags are:
o #define SEC_ACE_FLAG_OBJECT_INHERIT 0x1
o #define SEC_ACE_FLAG_CONTAINER_INHERIT 0x2
o #define SEC_ACE_FLAG_NO_PROPAGATE_INHERIT 0x4
o #define SEC_ACE_FLAG_INHERIT_ONLY 0x8
At present flags can only be specified as decimal or hexadecimal val-
The mask is a value which expresses the access right granted to the
SID. It can be given as a decimal or hexadecimal value, or by using one
of the following text strings which map to the NT file permissions of
the same name.
o R - Allow read access
o W - Allow write access
o X - Execute permission on the object
o D - Delete the object
o P - Change permissions
o O - Take ownership
The following combined permissions can be specified:
o READ - Equivalent to 'RX' permissions
o CHANGE - Equivalent to 'RXWD' permissions
o FULL - Equivalent to 'RWXDPO' permissions
The smbcacls program sets the exit status depending on the success or
otherwise of the operations performed. The exit status may be one of
the following values.
If the operation succeeded, smbcacls returns and exit status of 0. If
smbcacls couldn't connect to the specified server, or there was an
error getting or setting the ACLs, an exit status of 1 is returned. If
there was an error parsing any command line arguments, an exit status
of 2 is returned.
This man page is correct for version 2.2 of the Samba suite.
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.
smbcacls was written by Andrew Tridgell and Tim Potter.
The conversion to DocBook for Samba 2.2 was done by Gerald Carter
19 November 2002 SMBCACLS(1)