freebsd security - Jan 2016 - HPN and None options in OpenSSH

Slawa Olhovchenkov <slw at zxy.spb.ru> writes:
> Can you do some small discurs about ssh+kerberos?
> I am try to use FreeBSD with $HOME over kerberoized NFS.
> For kerberoized NFS gssd need to find cache file "called
> /tmp/krb5cc_<uid>, where <uid> is the effective uid for the RPC
> caller" (from `man gssd`).
>
> sshd contrary create cache file for received ticket called
> /tmp/krb5cc_XXXXXXX (random string, created by krb5_cc_new_unique). Is
> this strong security  requirement or [FreeBSD/upstream] can be patched
> (or introduce option) to use /tmp/krb5cc_<uid> as cache file for
> received ticket?
I wasn't aware of that.  It should be easy to patch, but in the
meantime, you can try something like this in .bashrc or whatever:

krb5cc_uid="/tmp/krb5cc_$(id -u)"
if [ -n "${KRB5CCNAME}" -a "${KRB5CCNAME}" !=
"${krb5ccuid}" ] ; then
        if mv "${KRB5CCNAME}" "${krb5ccuid}" ; then
                export KRB5CCNAME="${krb5ccuid}"
        else        
                echo "Unable to rename krb5 credential cache"
>&2
        fi
fi
unset krb5ccuid

DES
-- 
Dag-Erling Sm?rgrav - des at des.no

On Sun, Jan 24, 2016 at 03:50:45PM +0100, Dag-Erling Sm?rgrav wrote:
> Slawa Olhovchenkov <slw at zxy.spb.ru> writes:
> > Can you do some small discurs about ssh+kerberos?
> > I am try to use FreeBSD with $HOME over kerberoized NFS.
> > For kerberoized NFS gssd need to find cache file "called
> > /tmp/krb5cc_<uid>, where <uid> is the effective uid for
the RPC
> > caller" (from `man gssd`).
> >
> > sshd contrary create cache file for received ticket called
> > /tmp/krb5cc_XXXXXXX (random string, created by krb5_cc_new_unique). Is
> > this strong security  requirement or [FreeBSD/upstream] can be patched
> > (or introduce option) to use /tmp/krb5cc_<uid> as cache file for
> > received ticket?
> 
> I wasn't aware of that.  It should be easy to patch, but in the
Yes, I am already do ugly patch for me (2 files need to patch), but patch in
upstream preffered.
> meantime, you can try something like this in .bashrc or whatever:
Imposible. For accessing .bashrc on kerberoized NFS need correct
/tmp/krb5cc_<uid>.
> krb5cc_uid="/tmp/krb5cc_$(id -u)"
> if [ -n "${KRB5CCNAME}" -a "${KRB5CCNAME}" !=
"${krb5ccuid}" ] ; then
>         if mv "${KRB5CCNAME}" "${krb5ccuid}" ; then
>                 export KRB5CCNAME="${krb5ccuid}"
>         else        
>                 echo "Unable to rename krb5 credential cache"
>&2
>         fi
> fi
> unset krb5ccuid
> 
> DES
> -- 
> Dag-Erling Sm?rgrav - des at des.no