[Freeipa-users] Can mount NFS, but user only gets the permission question marks

[Brendan Kearney]

On 02/21/2017 10:57 AM, Kees Bakker wrote:
> Hey,
>
> Maybe one of the NFS users on this list could give me a hint what
> could be wrong. I'm not sure if it has any relation with FreeIPA/Kerberos.
>
> I've set up an NFS server and I can mount the NFS directory on my client. So, I'm
> guessing that setting up Kerberos principal was done correctly.
>
> However, only root can actually access the mounted contents. Any other user
> only sees question marks as shown below.
>
> The mount command is simple.
> $ sudo mount -v -t nfs srv1.example.com:/home /nfshome
> mount.nfs: timeout set for Tue Feb 21 16:36:39 2017
> mount.nfs: trying text-based options 'vers=4,addr=172.16.16.45,clientaddr=172.16.16.30'
>
> On the server side /etc/exports looks like this.
> /home        *(rw,sync,sec=krb5i,no_subtree_check)
>
> $ sudo mount |grep nfs
> srv1.example.com:/home on /nfshome type nfs4 (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=krb5i,clientaddr=172.16.16.30,local_lock=none,addr=172.16.16.45)
>
> $ sudo ls -ld /nfshome
> drwxr-xr-x 1 root root 72 feb 21 04:22 /nfshome
> $ sudo ls -l /nfshome
> total 0
> drwxr-xr-x 1 keesb  keesb  116 jan 27 12:56 keesb
>
> $ ls -l /nfshome
> ls: cannot access '/nfshome': Permission denied
> $ ls -l / | grep nfshome
> ls: cannot access '/nfshome': Permission denied
> d?????????   ? ?    ?       ?            ? nfshome
>
sec=krb* means that the user accessing the mount has to authenticate 
with a kerberos ticket, and has to be the user or in the group granted 
access to the share.  from the looks of things, the user did not 
authenticate, and that is why the permissions are question marks.  check 
the kerberos tickets that the user has (klist output).  Otherwise, the 
ownership might be user and group that the client machine does not 
recognize (think posix user/group that is not in sync between the NFS 
server and the client)

brendan