zfs_allow

- delegates ZFS file system administration permission to non-privileged users

Synopsis

zfs allow filesystem|volume

zfs allow [-ldug] everyone|user|group[,...] perm|@setname[,...] 
     filesystem|volume

zfs allow [-ld] -e perm|@setname[,...] filesystem|volume

zfs allow -c perm|@setname[,...] filesystem|volume

zfs allow -s @setname perm|@setname[,...] filesystem|volume

zfs unallow [-rldug] everyone|user|group[,...] [perm|@setname[,... ]] 
     filesystem|volume

zfs unallow [-rld] -e [perm|@setname[,... ]] filesystem|volume

zfs unallow [-r] -c [perm|@setname[ ... ]] filesystem|volume

zfs unallow [-r] -s @setname [perm|@setname[,... ]] filesystem|volume

Description

The zfs allow command can be used to delegate permissions to non-privileged users for administering ZFS file systems in a ZFS storage pool, as described in zpool(1M). You can use the zfs unallow command to revoke administrative permissions.

Permissions are generally the ability to use a ZFS subcommand or change a ZFS property. The following permissions are available:

NAME             TYPE           NOTES
allow            subcommand     Must also have the permission that is
                                being allowed
clone            subcommand     Must also have the 'create' ability and
                                'mount' ability in the origin file system
create           subcommand     Must also have the 'mount' ability
destroy          subcommand     Must also have the 'mount' ability
diff             subcommand     Allows user to compare differences
                                between snapshots of a ZFS dataset
hold             subcommand     Allows adding a user hold to a snapshot
key              subcommand     Allows key loading or unloading
keychange        other          Allows wrapping key change and re-key
mount            subcommand     Allows mount/umount of ZFS datasets
promote          subcommand     Must also have the 'mount' and 'promote'
                                ability in the origin file system
receive          subcommand     Must also have the 'mount' and 'create' ability
release          subcommand     Allows releasing a user hold which
                                might destroy the snapshot
rename           subcommand     Must also have the 'mount' and 'create'
                                ability in the new parent
rollback         subcommand
send             subcommand
share            subcommand     Allows sharing file systems over NFS or
                                SMB protocols
snapshot         subcommand
groupquota       other          Allows accessing any groupquota@...
                                property
groupused        other          Allows reading any groupused@... property
userprop         other          Allows changing any user property
userquota        other          Allows accessing any userquota@... property
userused         other          Allows reading any userused@... property
aclinherit       property
aclmode          property
atime            property
canmount         property
casesensitivity  property
checksum         property
compression      property
copies           property
dedup            property
devices          property
encryption       property
exec             property
keysource        property
logbias          property
mlslabel         property
mountpoint       property
nbmand           property
normalization    property
primarycache     property
quota            property
readonly         property
recordsize       property
refquota         property
refreservation   property
reservation      property
rstchown         property
secondarycache   property
setuid           property
sharenfs         property
sharesmb         property
snapdir          property
sync             property
utf8only         property
version          property
volblocksize     property
volsize          property
vscan            property
xattr            property
zoned            property

SUBCOMMANDS

All subcommands that modify state are logged persistently to the pool in their original form.

zfs ?

Displays a help message.

zfs help command | help | property property-name | permission

Displays zfs command usage information. You can display help for a specific command, property, or delegated permission. If you display help for a specific command or property, the command syntax or property value is displayed. Using zfs help without any arguments displays a complete list of zfs commands.

zfs allow filesystem | volume

Displays permissions that have been delegated on the specified filesystem or volume. See the other forms of zfs allow for more information.

zfs allow [-ldug] everyone|user|group[,...] perm|@setname[,...] filesystem| volume

zfs allow [-ld] -e perm|@setname[,...] filesystem | volume

Delegates ZFS administration permission for the file systems to non-privileged users.

[-ug] everyone|user|group[,...]

Specifies to whom the permissions are delegated. Multiple entities can be specified as a comma-separated list. If neither of the -ug options are specified, then the argument is interpreted preferentially as the keyword everyone, then as a user name, and lastly as a group name. To specify a user or group named “everyone”, use the -u or -g options. To specify a group with the same name as a user, use the -g options.

[-e] perm|@setname[,...]

Specifies that the permissions be delegated to everyone. Multiple permissions may be specified as a comma-separated list. Permission names are the same as ZFS subcommand and property names. See the property list below. Property set names, which begin with an at sign (@) , may be specified. See the -s form below for details.

[-ld] filesystem|volume

Specifies where the permissions are delegated. If neither of the -ld options are specified, or both are, then the permissions are allowed for the file system or volume, and all of its descendents. If only the -l option is used, then is allowed “locally” only for the specified file system. If only the -d option is used, then is allowed only for the descendent file systems.

zfs allow -c perm|@setname[,...] filesystem|volume

Sets “create time” permissions. These permissions are granted (locally) to the creator of any newly-created descendent file system.

zfs allow -s @setname perm|@setname[,...] filesystem|volume

Defines or adds permissions to a permission set. The set can be used by other zfs allow commands for the specified file system and its descendents. Sets are evaluated dynamically, so changes to a set are immediately reflected. Permission sets follow the same naming restrictions as ZFS file systems, but the name must begin with an “at sign” (@), and can be no more than 64 characters long.

zfs unallow [-rldug] everyone|user|group[,...] [perm|@setname[, ...]] filesystem|volume

zfs unallow [-rld] -e [perm|@setname [,...]] filesystem|volume

zfs unallow [-r] -c [perm|@setname[,...]]

filesystem|volume

Removes permissions that were granted with the zfs allow command. No permissions are explicitly denied, so other permissions granted are still in effect. For example, if the permission is granted by an ancestor. If no permissions are specified, then all permissions for the specified user, group, or everyone are removed. Specifying everyone (or using the -e option) only removes the permissions that were granted to everyone, not all permissions for every user and group. See the zfs allow command for a description of the -ldugec options.

-r

Recursively remove the permissions from this file system and all descendents.

zfs unallow [-r] -s @setname [perm|@setname[,...]]

filesystem|volume

Removes permissions from a permission set. If no permissions are specified, then all permissions are removed, thus removing the set entirely.

Examples

Example 1 Delegating ZFS Administration Permissions on a ZFS Dataset

The following example shows how to set permissions so that user anne can create, destroy, mount, and take snapshots on pool/home/anne. The permissions on pool/home/anne are also displayed.

# zfs allow anne create,destroy,mount,snapshot pool/home/anne
# zfs allow pool/home/anne
---- Permissions on pool/home/anne -----------------------------------
Local+Descendent permissions:
        user anne create,destroy,mount,snapshot

Because the pool/home/anne mount point permission is set to 755 by default, user anne will be unable to mount file systems under pool/home/anne. Set an ACL similar to the following syntax to provide mount point access:

# chmod A+user:anne:add_subdirectory:allow /pool/home/anne

Example 2 Delegating Create Time Permissions on a ZFS Dataset

The following example shows how to grant anyone in the group staff to create file systems in pool/home. This syntax also allows staff members to destroy their own file systems, but not destroy anyone else's file system. The permissions on pool/home are also displayed.

# zfs allow staff create,mount pool/home
# zfs allow -c destroy pool/home
# zfs allow pool/home
---- Permissions on pool/home ----------------------------------------
Create time permissions:
        destroy
Local+Descendent permissions:
        group staff create,mount

Example 3 Defining and Granting a Permission Set on a ZFS Dataset

The following example shows how to define and grant a permission set on the pool/home file system. The permissions on pool/home are also displayed.

# zfs allow -s @pset create,destroy,snapshot,mount pool/home
# zfs allow staff @pset pool/home
# zfs allow pool/home
---- Permissions on pool/home ----------------------------------------
Permission sets:
        @pset create,destroy,mount,snapshot
Create time permissions:
        destroy
Local+Descendent permissions:
        group staff @pset,create,mount

Example 4 Delegating Property Permissions on a ZFS Dataset

The following example shows to grant the ability to set quotas and reservations on the tank/users file system. The permissions on tank/users are also displayed.

# zfs allow mark quota,reservation tank/users
# zfs allow tank/users
---- Permissions on tank/users ---------------------------------------
Local+Descendent permissions:
        user mark quota,reservation
mark% zfs set quota=10G tank/users/tim   
mark% zfs get quota tank/users/tim
NAME            PROPERTY  VALUE  SOURCE
tank/users/tim  quota     10G    local

Example 5 Removing ZFS Delegated Permissions on a ZFS Dataset

The following example shows how to remove the snapshot permission from the @pset permission set for the staff group on the pool/home file system. The permissions on pool/home are also displayed.

# zfs unallow -s @pset snapshot pool/home
# zfs allow pool/home
---- Permissions on pool/home ----------------------------------------
Permission sets:
        @pset create,destroy,mount
Create time permissions:
        destroy
Local+Descendent permissions:
        group staff @pset,create,mount

Exit Status

The following exit values are returned:

0

Successful completion.

1

An error occurred.

2

Invalid command line options were specified.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

zfs(1M), zpool(1M), chmod(2), chown(2), attributes(5)

For information about using other ZFS features, see zfs_encrypt(1M), zfs_share(1M), zfs(1M) and the Oracle Solaris Administration: ZFS File Systems.