[Freeipa-users] AD trust with POSIX attributes

[Jan Karásek]

Hi, 

I am still fighting with storing user's POSIX attributes in AD. Please can anybody provide some simple reference settings of IPA-AD trust where users are able to get uid from AD - not from IPA ID pool ? 

I have tried to set values of attributes before and after creating trust, I have tried different sssd setting but I'm still getting uid from IPA idrange pool instead of from AD user's attribute. 

What exactly is IPA checking when it tries to decide what type of trust will be set - ['ipa-ad-trust-posix', 'ipa-ad-trust'] ? 

Do I have to mandatory fill some AD user's attributes to get it work ? Currently I'am testing just with uidNumber and gidNumber. 

There is almost no documentation about this topic so I don't know what else I can try ... 

Thanks for help, 

Jan 



Date: Tue, 21 Jun 2016 21:38:15 +0200 
From: Jakub Hrozek <jhrozek at redhat.com> 
To: freeipa-users at redhat.com 
Subject: Re: [Freeipa-users] AD trust with POSIX attributes 
Message-ID: <20160621193815.GS29512 at hendrix> 
Content-Type: text/plain; charset=iso-8859-1 

On Tue, Jun 21, 2016 at 01:55:54PM +0200, Jan Kar?sek wrote: 
> Hi all, 
> 
> I have a questions about IPA with AD forest trust. What I am trying to do is setup environment, where all informations about users are stored in one place - AD. I would like to read at least uid, home, shell and sshkey from AD. 
> 
> I have set up trust with this parameters: 
> 
> ipa trust-add EXAMPLE.TT --type=ad --range-type=ipa-ad-trust-posix --admin=administrator 

Did you add the POSIX attributes to AD after creating the trust maybe? 

> 
> [root at ipa1 ~]# ipa idrange-show EXAMPLE.TT_id_range 
> Range name: EXAMPLE.TT_id_range 
> First Posix ID of the range: 1392000000 
> Number of IDs in the range: 200000 
> Domain SID of the trusted domain: S-1-5-21-4123312533-990676102-3576722756 
> Range type: Active Directory trust range with POSIX attributes 
> 
> 
> I have set attributes in AD for user at EXAMPLE.TT 
> - uidNumber -10000 
> - homeDirectory -/home/user 
> - loginShell - /bin/bash 
> 
> Trust itself works fine. I can do kinit with user at EXAMPLE.TT , I can run id and getent passwd user at example.tt and I can use user at example.tt for ssh. 
> 
> Problem is, that I am not getting uid from AD but from idrange: 
> 
> uid=1392001107(user at example.tt) 
> 
> Also I have tried to switch off id mapping in sssd.conf with ldap_id_mapping = true in sssd.conf but no luck. 

This has no effect, in IPA-AD trust scenario, the id mapping properties 
are managed on the server. 

> 
> I know, that it is probably better to use ID views for this, but in our case we need to set centrally managed environment, where all users information are externally inserted to AD from HR system - included POSIX attributes and we need IPA to read them from AD. 

I think idviews are better for overriding POSIX attributes for a 
specific set of hosts, but in your environment, it sounds like you want 
to use the POSIX attributes across the board. 

> 
> So my questions are: 
> 
> Is it possible to read user's POSIX attributes directly from AD - namely uid ? 

Yes 

> Which atributes can be stored in AD ? 

Homedir is a bit special, for backwards compatibility the 
subdomains_homedir takes precedence. The others should be read from AD. 

I don't have the environment set at the moment, though, so I'm operating 
purely from memory. 

> Am I doing something wrong ? 
> 
> my sssd.conf: 
> [domain/a.example.tt] 
> debug_level = 5 
> cache_credentials = True 
> krb5_store_password_if_offline = True 
> ipa_domain = a.example.tt 
> id_provider = ipa 
> auth_provider = ipa 
> access_provider = ipa 
> ipa_hostname = ipa1.a.example.tt 
> chpass_provider = ipa 
> ipa_server = ipa1.a.example.tt 
> ipa_server_mode = True 
> ldap_tls_cacert = /etc/ipa/ca.crt 
> #ldap_id_mapping = true 
> #subdomain_inherit = ldap_user_principal 
> #ldap_user_principal = nosuchattribute 
> 
> [sssd] 
> services = nss, sudo, pam, ssh 
> config_file_version = 2 
> 
> domains = a.example.tt 
> [nss] 
> debug_level = 5 
> homedir_substring = /home 
> enum_cache_timeout = 2 
> entry_negative_timeout = 2 
> 
> 
> [pam] 
> debug_level = 5 
> [sudo] 
> 
> [autofs] 
> 
> [ssh] 
> debug_level = 4 
> [pac] 
> 
> debug_level = 4 
> [ifp] 
> 
> Thanks, 
> Jan 





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