> On 27 Dec 2016, at 20:29, Lesley Kimmel <[email protected]> wrote:
> 
> Hi, all. Thanks in advance for you help.
> 
> I am working to integrate some RHEL7 servers to AD. In doing so it seems 
> clear that SSSD is the way to go. However, it looks like there are basically 
> (2) options:
> 1) use sssd-ad (id_provider=ad, access_provider=ad)
> 2) Use explicit LDAP and Kerberos providers
> 
> I would prefer to use the sssd-ad method because it is obviously simpler. 
> However, I am unclear what security is provided therein. Obviously, Kerberos 
> is pretty secure for authentication. However, when groups, etc., are 
> retrieved from LDAP is that done over SSL/TLS?

SSSD also authenticates using the machine credentials (=the keytab) to AD. 
Normally, AD doesn’t even allow anonymous binds.

> It is implied that using the sssd-ad method is essentially a shorthand for 
> other LDAP/Kerberos settings and I can't find a complete listing of what 
> those settings are.
> 

Yeah, this is not trivial to deduce (we’re working on enhancing sssctl with a 
‘config-show’ action, but we’re not there yet). Maybe it would help to check 
the sssd debug messages when you start sssd,..

> If I configure the server to enforce STARTTLS is SSSD "smart enough" to work 
> with that if I use sssd-ad or would I need to go the LDAP+Kerberos route in 
> order to configure some of the TLS-related settings?
> 

The gssapi authentication is by default and cannot even be changed with sssd-ad.
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