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<treyd...@gmail.com>  wrote:
On Mon, Mar 3, 2014 at 7:29 PM, Dmitri Pal<d...@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.

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.



--
Thank you,
Dmitri Pal

Sr. Engineering Manager for IdM portfolio
Red Hat Inc.


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--
Thank you,
Dmitri Pal

Sr. Engineering Manager for IdM portfolio
Red Hat Inc.


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