On Sun, Mar 13, 2016 at 04:57:37PM -0400, Cyril Scetbon wrote:
> Jakub I'm not trying to know if I should or not use only sssd. I'd like to 
> know if I can have both working together.

Yes, you can, both modules provide the interface that PAM calls to.

> 
> You said sssd contact the ldap even if the password is cached for the group 
> information, right ? 
> If yes, is there a way to ask it to not contact the ldap if it has the 
> password and it has not expired yet (in the cache).

Yes, see:
    https://preichl.wordpress.com/2015/07/19/authenticate-against-cache-in-sssd/

> I'd like to avoid as much as possible to contact the LDAP as I only need 
> passwords and even if they change my application can wait for a day

Understood; you might also want to check the pam_id_timeout option and
the upstream ticket https://fedorahosted.org/sssd/ticket/2795

> 
> >> In my case, I don't need to access other information but the login (uses
> >> by a database that can use pam for authentication and all permissions are
> >> set at the database level). What is the option to not contact the server
> >> even for the group information if there is one ?
> > 
> > I'm sorry, but I don't understand what do you mean by "even for the group
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