Subject: Re: [vserver] Bug#633526: vserver kernel breaks ssh public_key authentication on NFS
From: Herbert Poetzl <herbert@13thfloor.at>
Date: Fri, 30 Sep 2011 02:10:47 +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?

we now understand the problem, and it was fixed for 
3.0.4 with the following patch: 

http://vserver.13thfloor.at/ExperimentalT/delta-nfs-fix02.diff

I'll try to provide similar patches for older kernels
in the following days ...

best,
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