[Freeipa-users] Using external KDC

Sat Mar 8 21:36:40 UTC 2014

I got a RHEL7-beta VM up and running with basic ipa install (no DNS and no NTP).

IPA is 3.3.3-5.el7
SSSD is 1.11.2-1.el7
krb5 is 1.11.3-31.el7

Based on the docs at http://www.freeipa.org/page/V3/OTP I attempted
the CLI commands under "Feature Management", with no luck.

For example:

---
# ipa config-mod --user-auth-type=['password', 'otp', 'radius']
Usage: ipa [global-options] config-mod [options]

ipa: error: no such option: --user-auth-type
---

The ipa subcommands "radiusproxy-*" do not exist either.

What version of IPA should I use to test this proof of concept?  The
docs mention needing Kerberos no earlier than 1.12, which isn't
available in EL7.

My understanding of Kerberos is not great, but is FreeIPA simply not
designed for external Kerberos (like the use of an external CA)?  Is
there possibly a way to utilize FreeIPA without Kerberos, and just
manage 389DS while still using the web interface (hard to find good
Identity Management Web UI) and CLI tools?  I'd still like to get this
working in FreeIPA, but am working on upgrading our HPC cluster to EL6
(or EL7) and moving to FreeIPA would be a great improvement over 389DS
in terms of manageability.

Thanks
- Trey

On Fri, Mar 7, 2014 at 4:38 PM, Dmitri Pal <dpal at redhat.com> wrote:
> On 03/07/2014 05:26 PM, Trey Dockendorf wrote:
>>
>> On Thu, Mar 6, 2014 at 7:20 PM, Dmitri Pal<dpal at redhat.com>  wrote:
>>>
>>> On 03/05/2014 06:24 PM, Trey Dockendorf wrote:
>>>>
>>>> Correction from my email, the condition that sets if a 389DS user is
>>>> proxied to pam_krb5 is the "pamFilter", sorry.
>>>>
>>>> On Wed, Mar 5, 2014 at 5:22 PM, Trey Dockendorf<treydock at gmail.com>
>>>> wrote:
>>>>>
>>>>> On Mon, Mar 3, 2014 at 7:29 PM, Dmitri Pal<dpal at redhat.com>   wrote:
>>>>>>
>>>>>> On 03/03/2014 07:47 PM, Simo Sorce wrote:
>>>>>>>
>>>>>>> On Mon, 2014-03-03 at 18:42 -0600, Trey Dockendorf wrote:
>>>>>>>>
>>>>>>>> Is it possible with FreeIPA to use an external KDC or pass some or
>>>>>>>> all
>>>>>>>> authentication to an external KDC?  The KDC at our University may
>>>>>>>> give
>>>>>>>> me a one way trust if I describe my implementation plan for FreeIPA.
>>>>>>>> Currently I use 389DS with PAM pass through using untrusted
>>>>>>>> pam_krb5.
>>>>>>>> I'd like to fully utilize FreeIPA without managing passwords since
>>>>>>>> all
>>>>>>>> my users already have University accounts.  I just want to manage
>>>>>>>> authorization for my systems, not authentication.
>>>>>>>
>>>>>>> You could set up a kerberos trust manually but at the moment we do
>>>>>>> not
>>>>>>> support it in the code or the utilities.
>>>>>>>
>>>>>>> SSSD in particular will have no place to find identity information if
>>>>>>> all you have is a kerberos trust, you'd need also an external
>>>>>>> identity
>>>>>>> store to point to, but there is no builtin code in SSSD to link the 2
>>>>>>> domain at this point.
>>>>>>>
>>>>>>> We are planning on working on IPA-to-IPA trust, and possibly
>>>>>>> IPA-to-*other* so any requirements you can throw at us will be made
>>>>>>> part
>>>>>>> of the consideration and planning to add this kind of functionality
>>>>>>> in
>>>>>>> the future.
>>>>>>>
>>>>>>> NM B HTH,
>>>>>>> Simo.
>>>>>>>
>>>>>> Can you describe your workflows because I have some idea in mind?
>>>>>
>>>>> Right now the workflow I have with 389ds using PAM Pass Through Auth
>>>>> is the following:
>>>>>
>>>>> For users with the proper attribute defined in 'pamIDAttr'
>>>>>
>>>>> client --->   389DS --->   389DS server's pam_krb5 --->   Campus KDC
>>>>>
>>>>> For users lacking the attribute for 'pamIDAttr'
>>>>>
>>>>> client --->   389DS
>>>>>
>>>>> The Kerberos setup currently on the 389DS server is untrusted (no
>>>>> krb5.keytab).
>>>>>
>>>>> The ideal workflow with FreeIPA would be
>>>>>
>>>>> client ---->   IPA --->   Campus KDC
>>>>>
>>>>>> Would you be OK if your accounts would be in IPA but the
>>>>>> authentication
>>>>>> would be proxied out?
>>>>>
>>>>> This is fine with me.  Does the idea you describe allow for some
>>>>> authentication (ie system accounts or internal accounts) to be handled
>>>>> by FreeIPA?  That's the benefit to us when using PAM Pass Through
>>>>> Auth, is that we can conditionally proxy out the authentication.
>>>>>
>>>>>> The idea is that you can use OTP RADIUS capability to proxy passwords
>>>>>> to
>>>>>> your main KDC.
>>>>>>
>>>>>> client ---OTP--->   IPA --->   OTP Proxy --->   RADIUS --->   Your KDC
>>>>>>
>>>>>> Disclaimer: that would defeat the purpose of Kerberos and the password
>>>>>> will
>>>>>> be sent over the wire but it seems that you are already in this setup.
>>>>>>
>>>>>> Would you be interested to give it a try?
>>>>>
>>>>> Absolutely.  Right now I need to contact our campus IT group and let
>>>>> them know what I require to make our setup work.  I have been told a
>>>>> one way trust is the most I can get.  Will that facilitate what you
>>>>> described?
>>>
>>>
>>> You do not need trust for that setup. Any user account (i am not sure
>>> about
>>> special system accounts that are not created in cn=users) would be able
>>> to
>>> go to external RADIUS server.
>>>
>>>
>>>>>> Would require latest SSSD and kerberos library on the client though
>>>>>> but
>>>>>> would work with LDAP binds too.
>>>>>
>>>>> Latest SSSD and Kerberos that's available in EL6, or latest upstream?
>>>
>>>
>>> Upstream.
>>>
>> Is it possible use these latest versions in EL6, or is using Fedora
>> 19+ the only feasible way to do this?  If using EL6 is not possible,
>> is it going to be something possible in EL7?
>
>
>
> Latest RHEL7 beta snapshots might be a good starting point.
> This will not be a part of RHEL6, sorry.
>
>
>>
>>> Please take a look at the design page: http://www.freeipa.org/page/V3/OTP
>>> -
>>> that will give you an idea about the internals.
>>>
>>> Latest upstream UI should be able to allow to configure external RADIUS
>>> servers and then change per user policy to proxy via RADIUS. Then you can
>>> try binding with LDAP to IPA using password from your main KDC.
>>> Then you can use SSSD on the same system to try to authenticate using
>>> Kerberos. You will create a new user, set him to use RADIUS server for
>>> authentication and then try to su to this user or ssh into the box as
>>> that
>>> user. It should work and klist should report a TGT for this user on the
>>> box.
>>>
>> Thanks for the info.  I'll see if I can piece together how to make this
>> work.
>
>
> Let me know if you need any help or guidance with this POC.
>
>
>>
>>>>>> --
>>>>>> Thank you,
>>>>>> Dmitri Pal
>>>>>>
>>>>>> Sr. Engineering Manager for IdM portfolio
>>>>>> Red Hat Inc.
>>>>>>
>>>>>>
>>>>>> -------------------------------
>>>>>> Looking to carve out IT costs?
>>>>>> www.redhat.com/carveoutcosts/
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Freeipa-users mailing list
>>>>>> Freeipa-users at redhat.com
>>>>>> https://www.redhat.com/mailman/listinfo/freeipa-users
>>>
>>>
>>>
>>> --
>>> Thank you,
>>> Dmitri Pal
>>>
>>> Sr. Engineering Manager for IdM portfolio
>>> Red Hat Inc.
>>>
>>>
>>> -------------------------------
>>> Looking to carve out IT costs?
>>> www.redhat.com/carveoutcosts/
>>>
>>>
>>>
>>> _______________________________________________
>>> Freeipa-users mailing list
>>> Freeipa-users at redhat.com
>>> https://www.redhat.com/mailman/listinfo/freeipa-users
>
>
>
> --
> Thank you,
> Dmitri Pal
>
> Sr. Engineering Manager for IdM portfolio
> Red Hat Inc.
>
>
> -------------------------------
> Looking to carve out IT costs?
> www.redhat.com/carveoutcosts/
>
>
>