[Freeipa-users] Active directory trust and SSH

[Jakub Hrozek]

On Tue, Sep 06, 2016 at 01:02:34AM -0400, Jim Richard wrote:
> So I have two-way trust setup and it seems to work.
> 
> And as described here: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Windows_Integration_Guide/trust-ssh.html
> 
> SSSD allows user names in the format user at AD.DOMAIN, ad.domain\user and AD\user
> 
> That works just as described.
> 
> I have two domains/realms - idm.placeiq.net and idm-ad.placeiq.net, the second being the Active Directory domain.
> 
> My desire is to have AD be the source for all user/authentication - the AD users will use their creds to ssh in to all of the Centos hosts in the idm.placeiq.net domain.
> 
> The hosts that live in IDM are a combination of Centos 6.8 and 7.X hosts.
> 
> How can I make it so a user does not have to:
> 
> ssh 'IDM-AD\Administrator’@hostname or ssh Administrator at idm-ad.placeiq.net@hostname
> 
> Instead when I say Administrator at hostname it auto-magically knows I mean "ssh Administrator at idm-ad.placeiq.net@10.1.41.202
> 
> I’ve tried modifiying krb5.conf as such but it seems like I’m missing a step.
> 
> [libdefaults]                                                                                                               
>   #default_realm = IDM.PLACEIQ.NET                                                                                          
>   default_realm = IDM-AD.PLACEIQ.NET
> 
> 
> I think my clients use the localauth plugin but I’m not entirely sure. If so, how can I configure its behavior?

Put:
    default_domain_suffix = AD.DOMAIN
into the [sssd] section of your sssd.conf.

This setting auto-qualifies any user or group queries unless you qualify
them yourself (so you need to qualify any IPA user/group lookups..).