[Freeipa-users] AD trust and UPN issue

[Jan Karásek]

Hi, 

thank you for the answer. I have already tried that workaround and still no luck. At the moment this is showstopper for us on two different projects at two different customers. 
Any chance to get it patch before 7.3 arrives ? 

Thanks, 
Jan 
---------------------------------------------------------------------- 


Date: Tue, 10 May 2016 14:38:01 +0200 
From: Jakub Hrozek <jhrozek at redhat.com> 
To: freeipa-users at redhat.com 
Subject: Re: [Freeipa-users] Fwd: AD trust and UPN issue 
Message-ID: <20160510123801.GE4011 at hendrix> 
Content-Type: text/plain; charset=iso-8859-1 

On Tue, May 10, 2016 at 02:17:07PM +0200, Jan Kar?sek wrote: 
> Hi all, 
> I have lab environment with IPA server and trust to Active directory. 
> IPA server is in a.example.com. 
> AD DC is in example.com. 
> We have also child AD subdomain ext.examle.com. 
> Everything is fine until the users in AD domain ext.example.com gets the UPN suffix of the root AD domain - example.com - which is pretty common scenario. 
> Example: 
> user at ext.examaple.com is set in AD with UPN user at example.com 
> 
> In this situation I am not able to login into my linux box with user at example.com 
> I have seen some open tickets on this issue 3559 and others, and they are marked as fixed in IPA 4.2 ... but I not sure if its already fixed in current packages. 
> Currently I am testing on RHEL7 with ipa-server-4.2.0-15.el7_2.6.1.x86_64 and the same situation is on Fedora 23 with freeipa-server-4.2.4-1.fc23.x86_64. 
> I have default settings - no changes in krb5.conf and sssd.conf after ipa trust-add. 
> Also I have found the workaround to set in krb5.conf (see topic: Cannot find KDC for realm "MYDOMAIN.NET" - AD trust and UPN issues in RH archive ) - add another realm just with EXT.EXAMPLE.COM = { kdc = ad.ext.example.com:88 } - but no effect. 
> Could you please confirm, that its possible to use IPA with different UPN suffix for users in AD than the domain name in which they are exists ? Is there any additional configuration needed to fix this scenario ? 

In general no, not until 7.3. But it might work with a workaround. Can 
you try setting: 
ldap_user_principal = nosuchattr 
subdomain_inherit = ldap_user_principal 
in sssd.conf's domain section on the server? (Yes, server, not client..) 

This should work without the workaround starting with 7.3..

Jan Karásek

ELOS Technologies s.r.o.
U Kanálky 5
120 00  Praha 2

tel. +420 607 008 891
e-mail: jan.karasek at elostech.cz
www.elostech.cz

----- Original Message -----
From: "freeipa-users-request" <freeipa-users-request at redhat.com>
To: freeipa-users at redhat.com
Sent: Tuesday, May 10, 2016 4:23:56 PM
Subject: Freeipa-users Digest, Vol 94, Issue 63

---------------------------------------------------------------------- 


Date: Tue, 10 May 2016 14:38:01 +0200 
From: Jakub Hrozek <jhrozek at redhat.com> 
To: freeipa-users at redhat.com 
Subject: Re: [Freeipa-users] Fwd: AD trust and UPN issue 
Message-ID: <20160510123801.GE4011 at hendrix> 
Content-Type: text/plain; charset=iso-8859-1 

On Tue, May 10, 2016 at 02:17:07PM +0200, Jan Kar?sek wrote: 
> Hi all, 
> I have lab environment with IPA server and trust to Active directory. 
> IPA server is in a.example.com. 
> AD DC is in example.com. 
> We have also child AD subdomain ext.examle.com. 
> Everything is fine until the users in AD domain ext.example.com gets the UPN suffix of the root AD domain - example.com - which is pretty common scenario. 
> Example: 
> user at ext.examaple.com is set in AD with UPN user at example.com 
> 
> In this situation I am not able to login into my linux box with user at example.com 
> I have seen some open tickets on this issue 3559 and others, and they are marked as fixed in IPA 4.2 ... but I not sure if its already fixed in current packages. 
> Currently I am testing on RHEL7 with ipa-server-4.2.0-15.el7_2.6.1.x86_64 and the same situation is on Fedora 23 with freeipa-server-4.2.4-1.fc23.x86_64. 
> I have default settings - no changes in krb5.conf and sssd.conf after ipa trust-add. 
> Also I have found the workaround to set in krb5.conf (see topic: Cannot find KDC for realm "MYDOMAIN.NET" - AD trust and UPN issues in RH archive ) - add another realm just with EXT.EXAMPLE.COM = { kdc = ad.ext.example.com:88 } - but no effect. 
> Could you please confirm, that its possible to use IPA with different UPN suffix for users in AD than the domain name in which they are exists ? Is there any additional configuration needed to fix this scenario ? 

In general no, not until 7.3. But it might work with a workaround. Can 
you try setting: 
ldap_user_principal = nosuchattr 
subdomain_inherit = ldap_user_principal 
in sssd.conf's domain section on the server? (Yes, server, not client..) 

This should work without the workaround starting with 7.3..