Sssd aficionados, It is with great interest that I read the announcement of SSSD version 1.15.3.
https://lists.fedorahosted.org/archives/list/sssd-users@lists.fedorahosted.org/thread/6EPEUSAXXMS4WCI7PUR6PU7AQB7K5EAJ/ Among the new features is this: In a setup where an IPA domain trusts an Active Directory domain, it is now possible to define the domain resolution order (see http://www.freeipa.org/page/Releases/4.5.0#AD_User_Short_Names). Starting with this version, SSSD is able to read and honor the domain resolution order, providing a way to resolve Active Directory users by just their short name. SSSD also supports a new option "domain_resolution_order" applicable in the "[sssd]" section that allows to configure short names for AD users in setup with "id_provider=ad" or in a setup with an older IPA server that doesn't support the "ipa config-mod --domain-resolution-order" configuration option. Also, it is now possible to use "use_fully_qualified_names=False" in a subdomain configuration, but please note that the user and group output from trusted domains will always be qualified to avoid conflicts. This corresponds exactly to a use case we have. In fact this design doc ( https://docs.pagure.org/SSSD.sssd/design_pages/shortnames.html) has excellent verbiage describing our use case: Use cases Allow the Administrator of an IdM deployment in a trust relationship with an AD forest to configure its IdM servers and associated IdM clients to allow user & group resolution and user authentication in all domains (or a subset of the domains) to be possible by using only the short names without the domain component, as it’s done by some 3rd party solutions. That’s our exact situation. We have a parent AD domain – company.com. We have 3 AD subdomains: amer.company.com, euro.company.com and asia.company.com. All 3 AD subdomains have a transitive trust with the parent domain. Meaning all 4 domains fully trust each other. All user and groups are in the 3 subdomains; none in the parent domain. We do not have an IPA server, not would our company’s AD administrators tolerate such – they don’t even allow trusts to Kerberos realms. (They’re very security-conscious – and windows-centric). We are currently using a 3rd party software product for our Linux AD integration. (actually, 2 products -- in different parts of the company). They’re currently doing user authentication from all 3 AD subdomains by short account name. They’re doing it by domain resolution order (always looking in the local domain first). In these products, I join the local AD sub-domain by creating a machine account under my OU. I have evaluated sssd-ad on RHEL7 as a potential replacement. There are some obscure dusty corners where sssd-ad may not be able to do what these 3 rd party products do. But outside of that handful of use cases, sssd-ad (& maybe a couple of companion PAM modules) seem like it’ll accomplish everything we need for AD-based Linux authentication. Except for cross-subdomain user authentication by short name. I’m able to login by short name in the local subdomain. Using: [domain/amer.company.com] use_fully_qualified_names = False Starting with version 1.15.3, I’m supposed to be able to add: domain_resolution_order = amer.company.com, euro.company.com, asia.company.com to the [sssd] section in /etc/sssd/sssd.conf. Then I’m supposed to change my current subdomain section: [domain/amer.company.com] use_fully_qualified_names = False To: [domain/amer.company.com/euro.company.com/asia.company.com] use_fully_qualified_names = False ? How does that work? To join the amer.company.com subdomain, ‘realm join’ on my test server created a machine account under my OU. Namely, spikerealm...@amer.company.com. (Realm join also properly created the Kerberos creds in the /etc/krb5.keytab file.) Thus for [domain/amer.company.com], I had to set up ldap_sasl_authid as so: ldap_sasl_authid = spikerealm...@amer.company.com And the other AD subdomains wouldn’t know about this machine account. I actually tried this recommended syntax (see https://docs.pagure.org/SSSD.sssd/design_pages/shortnames.html ): [domain/amer.company.com/euro.company.com/asia.company.com] And I caught a syntax error in /var/log/sssd/sssd.log on startup: (Sun May 13 15:11:07:070656 2018) [sssd] [sss_ini_call_validators] (0x0020): [rule/allowed_sections]: Section [domain/ amer.company.com/euro.company.com/asia.company.com] is not allowed. Check for typos. (Sun May 13 15:11:07:083115 2018) [sssd] [confdb_get_domain_internal] (0x0010): Unknown domain [amer.company.com] (Sun May 13 15:11:07:083247 2018) [sssd] [confdb_get_domains] (0x0010): Error (2 [No such file or directory]) retrieving domain [amer.company.com], skipping! Prior to sssd 1.15.3, in order to authenticate from the various AD subdomains with sssd-ad even by fully-qualified name, you had to join each subdomain. Is that still the case? I have to create a machine account in each subdomain for a given computer? Then create 3 separate sections in /etc/sssd/sssd.conf file? Like so: [sssd] … domain_resolution_order = amer.company.com, euro.company.com, asia.company.com domains = amer.company.com, euro.company.com, asia.company.com … [domain/amer.company.com] use_fully_qualified_names = False … ldap_sasl_authid = spikerealm...@amer.company.com [domain/euro.company.com] use_fully_qualified_names = False … ldap_sasl_authid = spikerealm...@euro.company.com [domain/apac.company.com] use_fully_qualified_names = False … ldap_sasl_authid = spikerealm...@apac.company.com and then I’d have to consolidate the 3 /etc/krb5.keytab files created by 'realm join' into one grand & glorious keytab file with all the above principals? After that, I'd be able to user authenticate from the various subdomains by short name? Spike White PS Since I’m testing on RHEL7, actually I’m testing version sssd-ad-1.16.0-19.el7.x86_64
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