[Freeipa-users] Trust services

[Dmitri Pal]

On 05/30/2014 08:23 PM, tizo wrote:
>
>
> On Fri, May 30, 2014 at 6:40 PM, Dmitri Pal <dpal at redhat.com 
> <mailto:dpal at redhat.com>> wrote:
>
>     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.
>
>
> Ok. And what about a mail server?. We are planning to use Zimbra, and 
> we want that users from both FreeIPA and AD use it. Could we just 
> configure it to authenticate against FreeIPA Kerberos?. Or do we have 
> to make something else?.
How do you plan to configure it? How can it be configured?
I assume we are talking about Zimbra web interface, right?

If Zimbra natively supports Kerberos then I would
1) Make Zimbra host system a member of the IPA domain
2) Make Zimbra a Kerberos service in IPA domain
3) Configure mod_auth_kerb or equivalent capbility for Zimbra to accept 
Kerberos tickets
4) Configure Zimbra to get account information from IPA compat tree - 
this way AD and IPA users will be available to it via LDAP
5) In case there is no ticket Zimbra would prompt user for user name and 
password and bind against IPA compat tree thus allowing authentication 
for IPA and trusted users.

In future when the world is old and wise I hope something like this [1] 
would be possible with Zimbra too.

[1] http://www.freeipa.org/page/Web_App_Authentication


-- 
Thank you,
Dmitri Pal

Sr. Engineering Manager IdM portfolio
Red Hat, Inc.

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