[SSSD] Active Directory integration issues

Ondrej Valousek webserv at s3group.cz
Wed Mar 21 08:23:47 UTC 2012


How did you create the computer account in AD? Manually or using Samba?
Ondrej

On 03/21/2012 07:05 AM, Rolf Loudon wrote:
> Hello
>
> I've installed sssd 1.5 on an ubuntu 11.10 server.  I've followed the howto at
> https://fedorahosted.org/sssd/wiki/Configuring%20sssd%20to%20authenticate%20with%20a%20Windows%202008%20Domain%20Server
>
> I wish to use SASL as the authentication to the AD KDC.  I add the computer account to the domain and test it as described with
> kinit -k -t /etc/krb5.keytab host/myhostname.domain.name at REALM.NAME
> then
> ldapsearch -h ad.kdc -b "dc=domainpart1,dc=domainpart2,dc=domainpart3" -Y GSSAPI cn=someuser
>
> and that all works fine.
>
> When I use this setup within sssd there are a two main issues.
>
> Firstly the logs tell me that the principal is not found in the KDC database.  But when I inspect it using ADSI Edit I see the SPN and UPN values that I expect to see and that match the principal it says it cannot find.  Likewise these principals can be seen from klist -kte /etc/krb5/keytab  (though it doesn't complain about not finding anything in the key tab)
>
> I can get round that issue temporarily by specifying the principal name using ldap_sasl_authid.  I'd still like to know what is wrong in that instance.
>
>
> Secondly the ldap_search_base strangely affects the authentication and the user lookup.  I don't know if the searching is subtree or not.  I can't see a parameter to make this explicit.
>
> If I set ldap_search_base (or ldap_user_search_base)  to dc=domainpart1,dc=domainpart2,dc=domainpart3  then I get errors about ldap_sasl_interactive_bind_s failing.
> however if I set the ldap_search_base to cn=users,dc=domainpart1,dc=domainpart2,dc=domainpart3  then those errors go away and the lookup is done.
>
> The problem is that the users do not live in cn=users,dc=domainpart1,dc=domainpart2,dc=domainpart3  they are in an OU elsewhere.  They can be found via a subtree search (as per the ldapsearch example above) if the search base is set to higher up the tree at just the domain components specification.
>
> But if I set the search base that way, then the sasl bind fails.
>
> Using both ldap_search_base and ldap_user_search_base makes no difference.
>
> Is there are way to separately define where the ldap_sasl_bind looks (unless I misunderstand it needs to look for the computer account, which is in cn=computers,dc=...  which is also not within cn=users,dc=... so its still confusing me) so that the search base can be set so the user lookup will work.
>
> I can successfully lookup the user if I use a simple bind with ldap_default_bind_dn and ldap_default_authtok rather than sasl.  And can show that the ldap_search_base affects this lookup in the above way.
>
> Really appreciate any pointers to these two problems.
>
> many thanks
>
> r.
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