I worked an sssd configuration case with my OS vendor in the last 3 weeks.
I have resolution and it's working 100% correctly.
Just wanted to double-check. A second set of eyes to verify this solution
is all above board.
The problem manifested itself in our multi-domain AD forest with Posix
Attributes. One parent domain that has a transitive trust with 4
(regional) child domains.
Thus all 4 child domains trust each other. All users and groups are stored
in the 4 child domains.
The original problem was that I was disabling subdomains_provider and
explicitly defining each of the 4 child domains. I had:
domains = amer.company.com,apac.company.com
That worked great -- for everything except universal groups. Universal
groups exist in the first domain in which they're created, but they're
replicated to each domain. However, each child domain for this group's
membership only has the local users of that domain. The full universal
group membership is stored only in the global catalog (GC).
The problem? The GC lookups are done in the subdomain_provider's code. So
by disabling subdomains_provider, I was disabling GC lookups. Thus, I was
getting the group membership only of the first child domain queried (
What that amounted to is that remote support personnel couldn't log into
local boxes, because they weren't listed in the allowed groups.
So I re-wrote the sssd.conf file and only explicitly defined the one local
child domain. I left on subdomain_provider, so it auto-discovered the
other domains (sssctl domain-list confirms this).
domains = amer.company.com
ldap_search_base = dc=AMER,dc=COMPANY,dc=COM
ldap_search_base = dc=APAC,dc=COMPANY,dc=COM
So then, universal groups showed all memberships. The only remaining
problem was that now it was only searching the amer.company.com
domain. So while a remote user was listed as a member of an allowed
universal group, the details of that user's account was not known.
I couldn't add these auto-discovered domains to the "domains" line. (only
domains explicitly defined in sssd.conf file are allowed in this line
apparently). But I was able to add:
domain_resolution_order = amer.company.com
Now all works 100%.
Is this all legit? Do you see any problems with above final sssd.conf
the changes are ok. However in theory both are not needed. The
ldap_search_base should be discovered automatically and
domain_resolution_order is only needed if you want SSSD to search the
different domains in exactly that order, without SSSD should still
search all domains until a matching user or group is found, but the
order is not defined.
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