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How to limit NFS access to the SVM root volume

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Applies to

ONTAP 9

Description

  • By default, when an SVM is created, the root volume is configured with 755 permissions.
  • This means that:
    • The user root (0) has effective permissions of 7, or Full Control.
    • The Group and Others permission levels are set to 5, which is Read & Execute.
  • When this is configured, everyone who accesses the SVM root volume can list and read junctions mounted below the SVM root volume.
  • In addition, the default export policy rule that is created when an SVM is configured using System Manager or vserver setup commands permits user access to the SVM root. 
Example:

cluster::> vserver export-policy rule show -vserver nfs_svm -policyname default -instance
 
                                    Vserver: nfs_svm 
                                Policy Name: default 
                                 Rule Index: 1 
                            Access Protocol: any 
Client Match Hostname, IP Address, Netgroup, or Domain: 0.0.0.0/0 
                             RO Access Rule: any 
                             RW Access Rule: any 
User ID To Which Anonymous Users Are Mapped: 65534 
                   Superuser Security Types: none 
               Honor SetUID Bits in SETATTR: true 
                  Allow Creation of Devices: true 

  • For example, if an SVM has 3 data volumes named "nfs4", "ntfs", and "unix"
  • All would be mounted under "/" and can be listed with the ls command by any user accessing the mount. 

Example:

# mount | grep /mnt 
x.x.x.e:/ on /mnt type nfs (rw,nfsvers=3,addr=x.x.x.e) 
# cd /mnt 
# ls 
nfs4  ntfs  unix 

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