On ti, 13 joulu 2016, Daniel P. Berrange wrote:
On Tue, Dec 13, 2016 at 12:19:45PM +0200, Alexander Bokovoy wrote:On ti, 13 joulu 2016, Alexander Bokovoy wrote: > On ti, 13 joulu 2016, Vít Ondruch wrote: > > > > > > Dne 12.12.2016 v 16:02 Stephen Gallagher napsal(a): > > > On 12/12/2016 04:53 AM, Vít Ondruch wrote: > > > > So several questions: > > > > > > > > 1) When I have 2 domains I login to with kerberos, how to really make it > > > > work. I don't want to kswitch all the time. I am using Kerberos to > > > > authenticate my email client, so I want to keep it working all the time. > > > > > > > There are patches still coming that will switch the fedora packaging tools to > > > use GSSAPI rather than Kerberos directly, which will handle auto-selecting the > > > right TGT. I'm not sure what the status is on this, but Patrick Uiterwijk (CCed) > > > was looking into it. > > > > I am probably missing something, but if I am not mistaken, the primary > > ticket depends on order of my kinit calls and I am using several apps > > which needs kerberos authentication, so I can hardly see how fedora > > packaging tools changes can solve the major issue, i.e. if I do kinit > > vondruch@xxxxxxxxxxxxxxxxx, this ticket becomes the primary ... > The story is always more complex than it seems. > > There is Kerberos protocol. There is also GSSAPI interface that allows > to wrap Kerberos use under a more general security exchange means. While > Kerberos tools can deal with multiple credential caches in the > collection only by addressing the currently selected credentials cache, > GSSAPI-aware applications enjoy ability to chose which credentials cache > from the collection to use based on the realm of the target service. > > Koji with a patch to use python-gssapi will have ability to choose the > credentials cache automatically based on the realm of the target > service, regardless of what credentials cache is active right now in the > collection. The version in Fedora right now (1.11.0-1.fc25) is not yet > built with the patch to use python-gssapi. A small correction: koji 1.11.0-1.fc25 does use python-requests-kerberos which uses python-kerberos which is using GSSAPI C library. I verified that koji in Fedora 25 does work with credentials cache collections and properly chooses the credentials cache which is not the one currently active. However, default Fedora 25 configuration[1] does not set the default ccache name to a collection, only FreeIPA client installer does this. As result, if you have no [libdefaults] default_ccache_name = KEYRING:persistent:%{uid} in your krb5.conf, you are using the defaults compiled into libkrb5 which is 'FILE:/tmp/krb5cc_%{uid}'. The latter is not a credentials cache _collection_ and cannot store multiple credentials from multiple realms. So, if you'd change default_ccache_name to a KEYRING:..-based version and re-logon, you'll be able to maintain multiple credentials caches at the same time. [1] http://pkgs.fedoraproject.org/cgit/rpms/krb5.git/tree/krb5.conf?h=f25Actually that's not quite right - if you look at krb5.spec you'll see it then munges that krb5.conf to add default_ccache_name = KEYRING:persistent:%{uid} so all F25 installs should get that by default - all of my fresh installs do.
Mea culpa. Thanks for the correction. So, for fresh F25 installs this should be working fine -- at least with koji. -- / Alexander Bokovoy _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
