smbcacls — Set or get ACLs on an NT file or directory names
smbcacls
{//server/share} {/filename} [-D|--delete acl] [-M|--modify acl] [-a|--add acl] [-S|--set acl] [-C|--chown name] [-G|--chgrp name] [-I allow|remove|copy] [--numeric] [-t] [-U username] [-d] [-e] [-m|--max-protocol LEVEL] [--query-security-info FLAGS] [--set-security-info FLAGS] [--sddl] [--domain-sid SID]
This tool is part of the samba(7) suite.
The smbcacls
program manipulates NT Access Control
Lists (ACLs) on SMB file shares. An ACL is comprised zero or more Access
Control Entries (ACEs), which define access restrictions for a specific
user or group.
The following options are available to the smbcacls
program.
The format of ACLs is described in the section ACL FORMAT
Add the entries specified to the ACL. Existing access control entries are unchanged.
Modify the mask value (permissions) for the ACEs specified on the command line. An error will be printed for each ACE specified that was not already present in the object's ACL.
Delete any ACEs specified on the command line. An error will be printed for each ACE specified that was not already present in the object's ACL.
This command sets the ACL on the object with only what is specified on the command line. Any existing ACL is erased. Note that the ACL specified must contain at least a revision, type, owner and group for the call to succeed.
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.
Set or unset the windows "Allow inheritable
permissions" check box using the -I
option. To set the check box pass allow. To unset the check
box pass either remove or copy. Remove will remove all
inherited acls. Copy will copy all the inherited acls.
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.
This allows the user to select the highest SMB protocol level that smbcacls will use to connect to the server. By default this is set to NT1, which is the highest available SMB1 protocol. To connect using SMB2 or SMB3 protocol, use the strings SMB2 or SMB3 respectively. Note that to connect to a Windows 2012 server with encrypted transport selecting a max-protocol of SMB3 is required.
Don't actually do anything, only validate the correctness of the arguments.
The security-info flags for queries.
The security-info flags for queries.
Output and input acls in sddl format.
SID used for sddl processing.
level
is an integer
from 0 to 10. The default value if this parameter is
not specified is 0.
The higher this value, the more detail will be logged to the log files about the activities of the server. At level 0, only critical errors and serious warnings will be logged. Level 1 is a reasonable level for day-to-day running - it generates a small amount of information about operations carried out.
Levels above 1 will generate considerable amounts of log data, and should only be used when investigating a problem. Levels above 3 are designed for use only by developers and generate HUGE amounts of log data, most of which is extremely cryptic.
Note that specifying this parameter here will
override the log level parameter
in the smb.conf
file.
Prints the program version number.
The file specified contains the
configuration details required by the server. The
information in this file includes server-specific
information such as what printcap file to use, as well
as descriptions of all the services that the server is
to provide. See smb.conf
for more information.
The default configuration file name is determined at
compile time.
Base directory name for log/debug files. The extension
".progname"
will be appended (e.g. log.smbclient,
log.smbd, etc...). The log file is never removed by the client.
Set the smb.conf(5) option "<name>" to value "<value>" from the command line. This overrides compiled-in defaults and options read from the configuration file.
If specified, this parameter suppresses the normal password prompt from the client to the user. This is useful when accessing a service that does not require a password.
Unless a password is specified on the command line or this parameter is specified, the client will request a password.
If a password is specified on the command line and this option is also defined the password on the command line will be silently ingnored and no password will be used.
Try to authenticate with kerberos. Only useful in an Active Directory environment.
Try to use the credentials cached by winbind.
This option allows you to specify a file from which to read the username and password used in the connection. The format of the file is
username = <value> password = <value> domain = <value>
Make certain that the permissions on the file restrict access from unwanted users.
Sets the SMB username or username and password.
If %password is not specified, the user will be prompted. The
client will first check the USER
environment variable, then the
LOGNAME
variable and if either exists, the
string is uppercased. If these environmental variables are not
found, the username GUEST
is used.
A third option is to use a credentials file which
contains the plaintext of the username and password. This
option is mainly provided for scripts where the admin does not
wish to pass the credentials on the command line or via environment
variables. If this method is used, make certain that the permissions
on the file restrict access from unwanted users. See the
-A
for more details.
Be cautious about including passwords in scripts. Also, on
many systems the command line of a running process may be seen
via the ps
command. To be safe always allow
rpcclient
to prompt for a password and type
it in directly.
Set the client signing state.
Use stored machine account password.
This command line parameter requires the remote server support the UNIX extensions or that the SMB3 protocol has been selected. Requests that the connection be encrypted. Negotiates SMB encryption using either SMB3 or POSIX extensions via GSSAPI. Uses the given credentials for the encryption negotiation (either kerberos or NTLMv1/v2 if given domain/username/password triple. Fails the connection if encryption cannot be negotiated.
The supplied password is the NT hash.
This option allows you to override
the NetBIOS name that Samba uses for itself. This is identical
to setting the netbios name parameter in
the smb.conf
file.
However, a command
line setting will take precedence over settings in
smb.conf
.
This specifies a NetBIOS scope that
nmblookup
will use to communicate with when
generating NetBIOS names. For details on the use of NetBIOS
scopes, see rfc1001.txt and rfc1002.txt. NetBIOS scopes are
very rarely used, only set this parameter
if you are the system administrator in charge of all the
NetBIOS systems you communicate with.
Set the SMB domain of the username. This overrides the default domain which is the domain defined in smb.conf. If the domain specified is the same as the servers NetBIOS name, it causes the client to log on using the servers local SAM (as opposed to the Domain SAM).
TCP socket options to set on the client
socket. See the socket options parameter in
the smb.conf
manual page for the list of valid
options.
Print a summary of command line options.
Display brief usage message.
The format of an ACL is one or more entries separated by either commas or newlines. An ACL entry is one of the following:
REVISION:<revision number> 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 S-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.
ACEs are specified with an "ACL:" prefix, and define permissions granted to an SID. The SID again can be specified in S-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 SID.
The type can be either ALLOWED or DENIED to allow/deny access to the SID. The flags values are generally zero for file ACEs and either 9 or 2 for directory ACEs. Some common flags are:
#define SEC_ACE_FLAG_OBJECT_INHERIT 0x1
#define SEC_ACE_FLAG_CONTAINER_INHERIT 0x2
#define SEC_ACE_FLAG_NO_PROPAGATE_INHERIT 0x4
#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.
R - Allow read access
W - Allow write access
X - Execute permission on the object
D - Delete the object
P - Change permissions
O - Take ownership
The following combined permissions can be specified:
READ - Equivalent to 'RX' permissions
CHANGE - Equivalent to 'RXWD' permissions
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.
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. The conversion to DocBook XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.