Subject: Re: [vserver] Bug#633526: vserver kernel breaks ssh public_key authentication on NFS
From: Herbert Poetzl <herbert@13thfloor.at>
Date: Tue, 12 Jul 2011 23:04:53 +0200

On Tue, Jul 12, 2011 at 04:27:55AM +0100, Ben Hutchings wrote:
> Does anyone understand this problem or have an idea of how to
> investigate it?

I do not really understand the problem (yet) here are some
questions:

 - NFS server is Linux-VServer patched? (yes, no)
   if so then:
   + NFS server has NFS tagging enabled? (yes, no)
   + filesystem exported is tagged? (yes, no)
     if so then:
     * what tagging and what filesystem is used?
  
 - NFS client is Linux-VServer patched? (yes, no)
  + if so then NFS client has NFS tagging enabled? (yes, no)

thanks in advance,
Herbert

> Ben.

> -------- Forwarded Message --------
> From: Harald Dunkel <harald.dunkel@aixigo.de>
> Reply-to: Harald Dunkel <harald.dunkel@aixigo.de>, 633526@bugs.debian.org
> To: submit@bugs.debian.org
> Subject: Bug#633526: vserver kernel breaks ssh public_key authentication on NFS
> Date: Mon, 11 Jul 2011 09:19:24 +0200
> 
> Package: linux-image-2.6-vserver-amd64
> Version: 2.6.32+29
> 
> 
> If I use the vserver kernel on a remote host, then I
> cannot login via ssh and public_key authentication. AFAICS
> the access rights to my authorized_keys file get corrupted.
> 
> Before I try to login it shows on the remote host:
> 
> # ls -l /home/hdunkel/.ssh/authorized_keys
> -rw-------   1 hdunkel users   1406 Jun 15 14:34 authorized_keys
> 
> 
> When I try to login I am asked for a password (although
> authorized_keys is set correctly). After this attempt I
> see on the remote host:
> 
> # ls -al /home/hdunkel/.ssh/authorized_keys
> -rw-------   1 4294967294 4294967294   1406 Jun 15 14:34 authorized_keys
> 
> "sshd -d" shows that sshd doesn't like this.
> 
> Using the regular Squeeze kernel without vserver patch
> there is no such problem.
> 
> /home is mounted via NFS:
> 
> # cat /proc/mounts | grep /home
> nfs-home:/space/home /home nfs4 rw,relatime,vers=4,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=172.19.96.103,minorversion=0,addr=172.19.96.215
0 0
> 
> The NFS server runs Squeeze, too.
> 
> 
> Regards
> 
> Harri
> 
> 
>