On Tue, Sep 19, 2017 at 04:25:21PM -0400, Simo Sorce wrote:
> On Tue, 2017-09-19 at 20:27 +0200, Jakub Hrozek via FreeIPA-users
> wrote:
> > On Mon, Sep 18, 2017 at 05:11:09PM +0200, Marius Bjørnstad via
> > FreeIPA-users wrote:
> > > Hi,
> > > 
> > > When /tmp is full, it is impossible to authenticate with Kerberos.
> > > Login with password over SSH and sudo don't work. Login with ssh
> > > key works fine. Here is the output in the system log when I try to
> > > log on via SSH with password auth (this is on RHEL 6):
> > > 
> > > Sep 18 16:56:59 vali sshd[35157]: Set /proc/self/oom_score_adj to 0
> > > Sep 18 16:56:59 vali sshd[35157]: Connection from 192.168.1.48 port
> > > 49917
> > > Sep 18 16:57:02 vali [sssd[krb5_child[35165]]]: Credentials cache
> > > I/O operation failed XXX
> > > Sep 18 16:57:02 vali [sssd[krb5_child[35165]]]: Credentials cache
> > > I/O operation failed XXX
> > > Sep 18 16:57:04 vali sshd[35157]: Failed password for paalmbj from
> > > 192.168.1.48 port 49917 ssh2
> > > Sep 18 16:57:07 vali sshd[35158]: Connection closed by 192.168.1.48
> > > 
> > > From SSH I get:
> > > Permission denied, please try again.
> > > 
> > > The problem seems to be that Kerberos can't store its credentials
> > > cache. Is this normal, and is there a way around it? Sure, ideally
> > > I should limit the space usable by each user, but that doesn't help
> > > when a given user needs to log in and fix their tmp usage.
> > 
> > Well, you need to store the credentials /somewhere/...so if the
> > credential storage is full, the only remaining thing is to fall back
> > to
> > cached passwords.
> > 
> > Which, if they are available (through cache_credentials=True in
> > sssd.conf) is what I'd expect to happen. If that doesn't happen,
> > please
> > post your sssd logs..
> > 
> 
> That should happen only if we are offline, not if krb auth fails?

Yes, you're right, sorry.

(Although we've had a request to allow to run sssd in a degraded
responder-only mode in case /var is full and the providers can't write
into the db, I guess that's what I confused the issue with)
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