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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.

   This program is only called if a share is mounted with the cifsacl
   mount option. The kernel will only upcall to do this conversion if that
   mount option is specified.

   cifs.idmap relies on a plugin to handle the ID mapping. If it can't
   find the plugin then it will not work properly. The plugin (or a
   symlink to it) must be at /etc/cifs-utils/idmap-plugin.

   In the case where cifs.idmap or the plugin are unavailable, file
   objects in a mounted share are assigned uid and gid of the credentials
   of the process that mounted the share. 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 in this situation.

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.conf(5) for more info on each field.

NOTES

   Support for upcalls to cifs.idmap was initially introduced in the 3.0
   kernel.

SEE ALSO

   request-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.



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