fs_setcell - Configures permissions for setuid programs from specified
fs setcell -cell <cell name>+ [-suid] [-nosuid] [-help]
fs setce -c <cell name>+ [-s] [-n] [-h]
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.
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.
-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
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.
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.
Prints the online help for this command. All other valid options
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
The issuer must be logged in as the local superuser root.
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