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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 ] [ -h ]
This tool is part of the Samba suite.
The smbcacls program manipulates NT Access Control Lists (ACLs) on SMB file shares.
The following options are available to the smbcacls program. The format of ACLs is
described in the section ACL FORMAT
Add the ACLs specified to the ACL list. Existing access control entries are
Modify the mask value (permissions) for the ACLs specified on the command line. An
error will be printed for each ACL specified that was not already present in the
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 specified 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 specified in the smb.conf file is used, or "username%password" or
"DOMAIN\username%password" and the password and workgroup names are used as pro-
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 first argument.
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 con-
vert 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
The owner and group specify the owner and group sids for the object. If a SID in the for-
mat CWS-1-x-y-z is specified this is used, otherwise the name specified is resolved using
the server on which the file or directory resides.
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 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 values.
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)
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