On 05/30/2014 05:00 PM, tizo wrote:

    From: Alexander Bokovoy <abokovoy redhat com>
    To: Sumit Bose <sbose redhat com>
    Cc: freeipa-users redhat com
    Subject: Re: [Freeipa-users] Trust services
    Date: Thu, 29 May 2014 02:47:38 -0400 (EDT)

----- Original Message -----
> On Wed, May 28, 2014 at 10:47:13AM -0300, tizo wrote:
> > I would like to know, if having configured trusts services between FreeIPA > > and Active Directory, allow AD users to authenticate in services that are
> > only configured to authenticate against FreeIPA.
> >
> > For example, having configured the trusts, if I have a mail server that is
> > using FreeIPA as its authentication method, can a user A from Active
> > Directory, who does not exist in FreeIPA, authenticate in the mail server?.
> It depends a bit on how the users authenticate exactly because IPA
> offers Kerberos and LDAP authentication.
> Kerberos should work out of the box because thats one of the trusts
> components, trusting Kerberos tickets from the other domain/realm.
> For LDAP authentication you should be able to find the users from the
> trusted domain in the compat tree below
> cn=compat,dc=your,dc=ipa,dc=domain . To authenticate the user you can
> do a LDAP bind with the DN form the compat tree and the password used in
> AD.
Please note that the latter is valid only for FreeIPA 3.3 and later.
FreeIPA 3.0 does not support authentication over LDAP in the compat tree.
/ Alexander Bokovoy

Ok. I will definitively use Kerberos. But looking at the diagram of page 22 in http://www.freeipa.org/images/1/1e/Devconf2013-linux-ad-integration-options.pdf I see that SSSD in the GNU/Linux host is authenticating against both Active Directory and FreeIPA. Does the email server that I mentioned before, have to be configured in a similar way that SSSD in the GNU/Linux host of the example? Or is just enough that it is configured against the FreeIPA Kerberos and nothing else?.

You configure client (SSSD) to point to IPA but it will discover that IPA is in trust relations and would know how to deal with tickets coming from AD side.
This is why there are two arrows. They show communication.

Thanks very much.

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Thank you,
Dmitri Pal

Sr. Engineering Manager IdM portfolio
Red Hat, Inc.

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