[Freeipa-devel] [PATCH] 0078 ipa-client-install: Obtain host TGT from one specific KDC

[Simo Sorce]

On Wed, 2012-09-12 at 16:04 +0200, Martin Kosek wrote:
> On 09/12/2012 02:58 PM, Jan Cholasta wrote:
> > Dne 12.9.2012 14:09, Petr Viktorin napsal(a):
> >> On 09/12/2012 01:20 PM, Petr Viktorin wrote:
> >>> On 09/11/2012 10:39 PM, Rob Crittenden wrote:
> >>>> Petr Viktorin wrote:
> >>>>> When installing the client, we need to take extra case to only contact
> >>>>> the one server we're installing against. Otherwise, in the real world,
> >>>>> we might hit a server that hasn't replicated info about the client yet.
> >>>>>
> >>>>> This patch fixes a bug where kinit attempted to contact a KDC that
> >>>>> didn't have the host principal yet.
> >>>>>
> >>>>>
> >>>>> To reproduce:
> >>>>>
> >>>>> - Install a "master" and "replica"
> >>>>> - Change the Kerberos DNS entries to only point to the replica:
> >>>>>      for REC_NAME in '_kerberos-master._tcp' '_kerberos-master._udp'
> >>>>> '_kerberos._tcp' '_kerberos._udp' '_kpasswd._tcp' '_kpasswd._udp'; do
> >>>>>          ipa dnsrecord-mod $DOMAIN $REC_NAME --srv-rec="0 100 88
> >>>>> $REPLICA_HOSTNAME"
> >>>>>      done
> >>>>>      ipa dnsrecord-mod $DOMAIN _ldap._tcp --srv-rec="0 100 389
> >>>>> $MASTER_HOSTNAME"
> >>>>>      ipa dnsrecord-find $DOMAIN  # check
> >>>>> - Sever communication between the hosts to disable replication:
> >>>>>      (on master)
> >>>>>      iptables -A INPUT -j DROP -p all --source $REPLICA_IP
> >>>>> - On client machine, put master as nameserver in /etc/resolv.conf &
> >>>>> install client
> >>>>>
> >>>>> This will fail without the patch.
> >>>>>
> >>>>>
> >>>>> Thanks to Petr Spacek, Simo, and Scott for helping to reproduce and
> >>>>> explain the bug. I learned a lot.
> >>>>>
> >>>>> https://fedorahosted.org/freeipa/ticket/2982
> >>>>
> >>>> ACK, pushed to master and ipa-3-0
> >>>>
> >>>> rob
> >>>>
> >>>
> >>> The patch broke server installs. Please revert it if you're having
> >>> trouble while I look into it.
> >>>
> >>>
> >>
> >> I messed up and removed the kinit call entirely when installing on
> >> master. Attaching a fix.
> >>
> > 
> > Works for me, ACK.
> > 
> > Honza
> > 
> 
> When the server installation is complete, I was surprised to see I have now
> host credentials in my CCACHE:
> 
> # ipa-server-install --setup-dns
> ...
> ==============================================================================
> Setup complete
> 
> Next steps:
> 	1. You must make sure these network ports are open:
> 		TCP Ports:
> 		  * 80, 443: HTTP/HTTPS
> 		  * 389, 636: LDAP/LDAPS
> 		  * 88, 464: kerberos
> 		  * 53: bind
> 		UDP Ports:
> 		  * 88, 464: kerberos
> 		  * 53: bind
> 		  * 123: ntp
> 
> 	2. You can now obtain a kerberos ticket using the command: 'kinit admin'
> 	   This ticket will allow you to use the IPA tools (e.g., ipa user-add)
> 	   and the web user interface.
> 
> Be sure to back up the CA certificate stored in /root/cacert.p12
> This file is required to create replicas. The password for this
> file is the Directory Manager password
> 
> # klist
> Ticket cache: FILE:/tmp/krb5cc_0
> Default principal: host/vm-086.idm.lab.bos.redhat.com at IDM.LAB.BOS.REDHAT.COM
> 
> Valid starting     Expires            Service principal
> 09/12/12 09:28:24  09/13/12 09:28:24
> krbtgt/IDM.LAB.BOS.REDHAT.COM at IDM.LAB.BOS.REDHAT.COM
> 09/12/12 09:28:24  09/13/12 09:28:24
> HTTP/vm-086.idm.lab.bos.redhat.com at IDM.LAB.BOS.REDHAT.COM
> 09/12/12 09:28:26  09/13/12 09:28:24
> DNS/vm-086.idm.lab.bos.redhat.com at IDM.LAB.BOS.REDHAT.COM
> 
> 
> I don't think this is an expected behavior, installer should use a CCACHE
> separate from user's default.

Definitely,
a private install ccache should be used.
Please open a ticket.

Simo.

-- 
Simo Sorce * Red Hat, Inc * New York