Provided by: openafs-client_1.6.15-1ubuntu1.1_amd64 
NAME
fs_setacl - Sets the ACL for a directory
SYNOPSIS
fs setacl -dir <directory>+ -acl <access list entries>+
[-clear] [-negative] [-id] [-if] [-help]
fs sa -d <directory>+ -a <access list entries>+
[-c] [-n] [-id] [-if] [-h]
fs seta -d <directory>+ -a <access list entries>+
[-c] [-n] [-id] [-if] [-h]
DESCRIPTION
The fs setacl command adds the access control list (ACL) entries specified with the -acl argument to the
ACL of each directory named by the -dir argument.
If the -dir argument designates a pathname in DFS filespace (accessed via the AFS/DFS Migration Toolkit
Protocol Translator), it can be a file as well as a directory. The ACL must already include an entry for
"mask_obj", however.
Only user and group entries are acceptable values for the -acl argument. Do not place machine entries (IP
addresses) directly on an ACL; instead, make the machine entry a group member and place the group on the
ACL.
To completely erase the existing ACL before adding the new entries, provide the -clear flag. To add the
specified entries to the "Negative rights" section of the ACL (deny rights to specified users or groups),
provide the -negative flag.
To display an ACL, use the fs listacl command. To copy an ACL from one directory to another, use the fs
copyacl command.
CAUTIONS
If the ACL already grants certain permissions to a user or group, the permissions specified with the fs
setacl command replace the existing permissions, rather than being added to them.
Setting negative permissions is generally unnecessary and not recommended. Simply omitting a user or
group from the "Normal rights" section of the ACL is normally adequate to prevent access. In particular,
note that it is futile to deny permissions that are granted to members of the system:anyuser group on the
same ACL; the user needs only to issue the unlog command to receive the denied permissions.
When including the -clear option, be sure to reinstate an entry for each directory's owner that includes
at least the "l" (lookup) permission. Without that permission, it is impossible to resolve the "dot"
(".") and "dot dot" ("..") shorthand from within the directory. (The directory's owner does implicitly
have the "a" (administer) permission even on a cleared ACL, but must know to use it to add other
permissions.)
OPTIONS
-dir <directory>+
Names each AFS directory, or DFS directory or file, for which the set the ACL. Partial pathnames are
interpreted relative to the current working directory.
Specify the read/write path to each directory (or DFS file), to avoid the failure that results from
attempting to change a read-only volume. By convention, the read/write path is indicated by placing a
period before the cell name at the pathname's second level (for example, /afs/.abc.com). For further
discussion of the concept of read/write and read-only paths through the filespace, see the fs mkmount
reference page.
-acl <access list entries>+
Defines a list of one or more ACL entries, each a pair that names:
• A user name or group name as listed in the Protection Database.
• One or more ACL permissions, indicated either by combining the individual letters or by one of
the four acceptable shorthand words.
in that order, separated by a space (thus every instance of this argument has two parts). The
accepted AFS abbreviations and shorthand words, and the meaning of each, are as follows:
a (administer)
Change the entries on the ACL.
d (delete)
Remove files and subdirectories from the directory or move them to other directories.
i (insert)
Add files or subdirectories to the directory by copying, moving or creating.
k (lock)
Set read locks or write locks on the files in the directory.
l (lookup)
List the files and subdirectories in the directory, stat the directory itself, and issue the fs
listacl command to examine the directory's ACL.
r (read)
Read the contents of files in the directory; issue the "ls -l" command to stat the elements in
the directory.
w (write)
Modify the contents of files in the directory, and issue the UNIX chmod command to change their
mode bits.
A, B, C, D, E, F, G, H
Have no default meaning to the AFS server processes, but are made available for applications to
use in controlling access to the directory's contents in additional ways. The letters must be
uppercase.
all Equals all seven permissions ("rlidwka").
none
No permissions. Removes the user/group from the ACL, but does not guarantee they have no
permissions if they belong to groups that remain on the ACL.
read
Equals the "r" (read) and "l" (lookup) permissions.
write
Equals all permissions except "a" (administer), that is, "rlidwk".
It is acceptable to mix entries that combine the individual letters with entries that use the
shorthand words, but not use both types of notation within an individual pairing of user or group and
permissions.
Granting the "l" (lookup) and "i" (insert) permissions without granting the "w" (write) and/or "r"
(read) permissions is a special case, and grants rights approrpriate for "dropbox" directories. See
the DROPBOXES section for details.
If setting ACLs on a pathname in DFS filespace, see the DFS documentation for the proper format and
acceptable values for DFS ACL entries.
-clear
Removes all existing entries on each ACL before adding the entries specified with the -acl argument.
-negative
Places the specified ACL entries in the "Negative rights" section of each ACL, explicitly denying the
rights to the user or group, even if entries on the accompanying "Normal rights" section of the ACL
grant them permissions.
This argument is not supported for DFS files or directories, because DFS does not implement negative
ACL permissions.
-id Places the ACL entries on the Initial Container ACL of each DFS directory, which are the only file
system objects for which this flag is supported.
-if Places the ACL entries on the Initial Object ACL of each DFS directory, which are the only file
system objects for which this flag is supported.
-help
Prints the online help for this command. All other valid options are ignored.
DROPBOXES
If an accessing user has the "l" (lookup) and "i" (insert) permissions on a directory, but not the "w"
(write) and/or "r" (read) permissions, the user is implicitly granted the ability to write and/or read
any file they create in that directory, until they close the file. This is to allow "dropbox"-style
directories to exist, where users can deposit files, but cannot modify them later nor can they modify or
read any files deposited in the directory by other users.
Note, however, that the dropbox functionality is not perfect. The fileserver does not have knowledge of
when a file is opened or closed on the client, and so the fileserver always allows an accessing user to
read or write to a file in a "dropbox" directory if they own the file. While the client prevents the
user from reading or modifying their deposited file later, this is not enforced on the fileserver, and so
should not be relied on for security.
Additionally, if "dropbox" permissions are granted to "system:anyuser", unauthenticated users may deposit
files in the directory. If an unauthenticated user deposits a file in the directory, the new file will be
owned by the unauthenticated user ID, and is thus potentially modifiable by anyone.
In an effort to try and reduce accidentally publicizing private data, the fileserver may refuse read
requests for "dropbox" files from unauthenticated users. As a result, depositing files as an
unauthenticated user may arbitrarily fail if "system:anyuser" has been granted dropbox permissions. While
this should be rare, it is not completely preventable, and so for this reason relying on unauthenticated
users to be able to deposit files in a dropbox is NOT RECOMMENDED.
EXAMPLES
The following example adds two entries to the "Normal rights" section of the current working directory's
ACL: the first entry grants "r" (read) and "l" (lookup) permissions to the group pat:friends, while the
other (using the "write" shorthand) gives all permissions except "a" (administer) to the user "smith".
% fs setacl -dir . -acl pat:friends rl smith write
% fs listacl -path .
Access list for . is
Normal rights:
pat:friends rl
smith rlidwk
The following example includes the -clear flag, which removes the existing permissions (as displayed with
the fs listacl command) from the current working directory's reports subdirectory and replaces them with
a new set.
% fs listacl -dir reports
Access list for reports is
Normal rights:
system:authuser rl
pat:friends rlid
smith rlidwk
pat rlidwka
Negative rights:
terry rl
% fs setacl -clear -dir reports -acl pat all smith write system:anyuser rl
% fs listacl -dir reports
Access list for reports is
Normal rights:
system:anyuser rl
smith rlidwk
pat rlidwka
The following example use the -dir and -acl switches because it sets the ACL for more than one directory
(both the current working directory and its public subdirectory).
% fs setacl -dir . public -acl pat:friends rli
% fs listacl -path . public
Access list for . is
Normal rights:
pat rlidwka
pat:friends rli
Access list for public is
Normal rights:
pat rlidwka
pat:friends rli
PRIVILEGE REQUIRED
The issuer must have the "a" (administer) permission on the directory's ACL, a member of the
system:administrators group, or, as a special case, must be the UID owner of the top-level directory of
the volume containing this directory. The last provision allows the UID owner of a volume to repair
accidental ACL errors without requiring intervention by a member of system:administrators.
Earlier versions of OpenAFS also extended implicit administer permission to the owner of any directory.
In current versions of OpenAFS, only the owner of the top-level directory of the volume has this special
permission.
SEE ALSO
fs_copyacl(1), fs_listacl(1), fs_mkmount(1)
COPYRIGHT
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.