xenial (1) fs_setcell.1.gz

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NAME

       fs_setcell - Configures permissions for setuid programs from specified cells

SYNOPSIS

       fs setcell -cell <cell name>+ [-suid] [-nosuid] [-help]

       fs setce -c <cell name>+ [-s] [-n] [-h]

DESCRIPTION

       The fs setcell command sets whether the Cache Manager allows programs (and other executable files) from
       each cell named by the -cell argument to run with setuid permission. By default, the Cache Manager allows
       programs from its home cell to run with setuid permission, but not programs from any foreign cells. A
       program belongs to the same cell as the file server machine that houses the volume in which the program's
       binary file resides, as specified in the file server machine's /etc/openafs/server/ThisCell file. The
       Cache Manager determines its own home cell by reading the /etc/openafs/ThisCell file at initialization.

       To enable programs from each specified cell to run with setuid permission, include the -suid flag. To
       prohibit programs from running with setuid permission, include the -nosuid flag, or omit both flags.

       The fs setcell command directly alters a cell's setuid status as recorded in kernel memory, so rebooting
       the machine is unnecessary.  However, non-default settings do not persist across reboots of the machine
       unless the appropriate fs setcell command appears in the machine's AFS initialization file.

       To display a cell's setuid status, issue the fs getcellstatus command.

CAUTIONS

       AFS does not recognize effective UID: if a setuid program accesses AFS files and directories, it does so
       using the current AFS identity of the AFS user who initialized the program, not of the program's owner.
       Only the local file system recognizes effective UID.

       Only members of the system:administrators group can turn on the setuid mode bit on an AFS file or
       directory.

       When the setuid mode bit is turned on, the UNIX "ls -l" command displays the third user mode bit as an
       "s" instead of an "x". However, the "s" does not appear on an AFS file or directory unless setuid
       permission is enabled for the cell in which the file resides.

OPTIONS

       -cell <cell name>+
           Names each cell for which to set setuid status. Provide the fully qualified domain name, or a
           shortened form that disambiguates it from the other cells listed in the local /etc/openafs/CellServDB
           file.

       -suid
           Allows programs from each specified cell to run with setuid privilege. Provide it or the -nosuid
           flag, or omit both flags to disallow programs from running with setuid privilege.

       -nosuid
           Prevents programs from each specified cell from running with setuid privilege. Provide it or the
           -suid flag, or omit both flags to disallow programs form running with setuid privilege.

       -help
           Prints the online help for this command. All other valid options are ignored.

EXAMPLES

       The following command enables executable files from the State University cell to run with setuid
       privilege on the local machine:

          % fs setcell -cell stateu.edu -suid

PRIVILEGE REQUIRED

       The issuer must be logged in as the local superuser root.

SEE ALSO

       fs_getcellstatus(1)

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD
       by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth
       Cassell.