X2Go Bug report logs - #731
Kerbers cred delegation fails on Linux

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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: submit@bugs.x2go.org

Subject: if KRB5CCNAME is not set client-side, don't trigger the KRB5 delegation code

Date: Fri, 09 Jan 2015 23:09:15 +0000

[Message part 1 (text/plain, inline)]

Package: x2goclient
Severity: important
Version: 4.0.3.1

If the $KRB5CCNAME envvar is not set, X2Go Client nonetheless tries to  
push the KRB5CCNAME file to the X2Go Server.

This results in a Qt error message window, because the copy command  
(cp $KRB5CCNAME $KRBFL just before executing x2goruncommand) is only  
evoked with one parameter ($KRBFL, $KRB5CCNAME is unset).

"""
x2go-DEBUG-../sshprocess.cpp:449> ssh finished: false - "cp: Fehlender  
ZieldateiOperand hinter  
/home/mike/.x2go/C-mike-52-1420843691_stDMATE_dp24/krb5cc
cp --help liefert weitere Informationen.
" (5).
"""


Mike


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[Message part 2 (application/pgp-signature, inline)]

Message #12 received at 731@bugs.x2go.org (full text, mbox, reply):

From: Orion Poplawski <orion@cora.nwra.com>

To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 731@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#731: if KRB5CCNAME is not set client-side, don't trigger the KRB5 delegation code

Date: Wed, 18 Jan 2017 13:17:05 -0700

On 01/09/2015 04:09 PM, Mike Gabriel wrote:
> Package: x2goclient
> Severity: important
> Version: 4.0.3.1
> 
> If the $KRB5CCNAME envvar is not set, X2Go Client nonetheless tries to push
> the KRB5CCNAME file to the X2Go Server.
> 
> This results in a Qt error message window, because the copy command (cp
> $KRB5CCNAME $KRBFL just before executing x2goruncommand) is only evoked with
> one parameter ($KRBFL, $KRB5CCNAME is unset).
> 
> """
> x2go-DEBUG-../sshprocess.cpp:449> ssh finished: false - "cp: Fehlender
> ZieldateiOperand hinter /home/mike/.x2go/C-mike-52-1420843691_stDMATE_dp24/krb5cc
> cp --help liefert weitere Informationen.
> " (5).
> """

I'm not sure if any of this is necessary:


     if(sshConnection->useKerberos() && sshConnection->get_kerberosDelegation())
    {
        krbFwString="KRB5CCNAME=`echo $KRB5CCNAME |sed 's/FILE://g'` \
        KRBFL=$HOME/.x2go/C-"+resumingSession.sessionId+"/krb5cc ;\
        cp -a $KRB5CCNAME $KRBFL;KRB5CCNAME=$KRBFL ";
    }

I believe that SSH will handle the delegation of GSSAPI/Kerberos credentials.
In my case, I'm using the modern keyring credentials cache:

KRB5CCNAME=KEYRING:persistent:22603

so I get:

cp: cannot stat âKEYRING:persistent:22603:22603â: No such file or directory

however my credentials are present on the remote machine and I can get to them
if I unset KRB5CCNAME.

-- 
Orion Poplawski
Technical Manager                          720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion@nwra.com
Boulder, CO 80301                   http://www.nwra.com

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