The System Security Services Daemon (SSSD) feature provides access on a client system to remote identity and authentication providers. The SSSD acts as an intermediary between local clients and any back-end provider that you configure.
The benefits of configuring SSSD include:
Reduced system load
Clients do not have to contact the identification or authentication servers directly.
Offline authentication
You can configure SSSD to maintain a cache of user identities and credentials.
Single sign-on access
If you configure SSSD to store network credentials, users need only authenticate once per session with the local system to access network resources.
For more information, see the authconfig(8),
pam_sss(8), sssd(8), and
sssd.conf(5) manual pages and https://fedorahosted.org/sssd/.