We normally store credentials in the kernel keyring, have you changed
the default ccache type in your installation ?

If you have elected to use /tmp to store ccaches and it is full it is
expected for auth to fail.

Simo.

On Mon, 2017-09-18 at 17:11 +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.
> 
> Thanks,
> Marius
> _______________________________________________
> FreeIPA-users mailing list -- freeipa-users@lists.fedorahosted.org
> To unsubscribe send an email to freeipa-users-leave@lists.fedorahoste
> d.org

-- 
Simo Sorce
Sr. Principal Software Engineer
Red Hat, Inc
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