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Root user gets access denied to access NTFS volume due to root squash

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • NFSv3

Issue

  • NFSv3 client root user can mount NTFS volume, but gets permission denied in accessing the volume
[root@cliet1 ~]# cd /mnt/ontap_share
-bash: cd: /mnt/ontap_share: Permission denied
  • The root user has proper name mapping configured 
  • The Superuser Security type is set to nonein the export policy rule
::> export-policy rule show -vserver svm1 -clientmatch nfsclient1 -fields vserver,ruleindex,clientmatch,superuser,protocol,policyname,anon
vserver            policyname  ruleindex protocol clientmatch            anon  superuser
------------------ ----------- --------- -------- ------------------------- ----- ---------
svm1                policy1    20         nfs      nfsclient1.ntap.local 65534 none
 
  • Security trace shows access denied on the anonymous user, indicating the root user is squashed to the anonymous user with UID 65534
Node            Index Filter Details             Reason
--------------- ----- -------------------------- ----------------------------------------------------------------
node1           1     Security Style: NTFS and   Access is denied because the UNIX user could not be                       NT ACL                     mapped to a valid NT user while reading the user's access rights                                                  on an object.
                      Protocol: nfs
                      Volume: vol1
                      Share: -
                      Path: /data/
                      Win-User: -
                      UNIX-User: 65534
                      Session-ID: -

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