CIFS.IDMAP(8) System Administration tools CIFS.IDMAP(8)NAME
cifs.idmap - Userspace helper for mapping ids for Common Internet File
System (CIFS)
SYNOPSIS
cifs.idmap [--help|-h] [--timeout|-t] [--version|-v] {keyid}
DESCRIPTION
This tool is part of the cifs-utils suite.
cifs.idmap is a userspace helper program for the linux CIFS client
filesystem. There are a number of activities that the kernel cannot
easily do itself. This program is a callout program that does these
things for the kernel and then returns the result.
cifs.idmap is generally intended to be run when the kernel calls
request-key(8) for a particular key type. While it can be run directly
from the command-line, it is not generally intended to be run that way.
cifs.idmap works in conjuction with winbind facility of Samba suite to
map owner and group SIDs to uids and gids respectively. It is best
utilized when
- a mount option of cifsacl is specified when mounting a cifs share
- winbind is specified as one of the search entries for passwd and
group databases in file /etc/nsswitch.conf
- file smb.conf has winbind specific entries
- winbind daemon program is running
In case winbind and cifs.idmap facilities are unavailable, file objects
in a mounted share are assigned uid and gid of the credentials of the
process that mounted the share. So it is strongly recomemended to use
mount options of uid and gid to specify a default uid and gid to map
owner SIDs and group SIDs respectively in case services of winbind and
cifs.idmap facility are unavailable.
OPTIONS
--help|-h
Print the usage message and exit.
--timeout|-t
Set the expiration timer, in seconds on the key. The default is 600
seconds (10 minutes). Setting this to 0 will cause the key to never
expire.
--version|-v
Print version number and exit.
CONFIGURATION FOR KEYCTL
cifs.idmap is designed to be called from the kernel via the request-key
callout program. This requires that request-key be told where and how
to call this program. Currently cifs.idmap handles a key type of:
cifs.idmap
This keytype is for mapping a SID to either an uid or a gid
To make this program useful for CIFS, you will need to set up entry for
it in request-key.conf(5). Here is an example of an entry for this key
type:
#OPERATION TYPE D C PROGRAM ARG1 ARG2...
#========= ============= = = ================================
create cifs.idmap * * /usr/sbin/cifs.idmap %k
See request-key.conf5() for more info on each field.
SEE ALSOrequest-key.conf(5), mount.cifs(8)AUTHOR
Shirish Pargaonkar wrote the cifs.idmap program.
The Linux CIFS Mailing list is the preferred place to ask questions
regarding these programs.
cifs-utils 05/26/2011 CIFS.IDMAP(8)