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Chapitre 2. Understanding SSSD and its benefits

The System Security Services Daemon (SSSD) is a system service to access remote directories and authentication mechanisms. The following chapters outline how SSSD works, what are the benefits of using it, how the configuration files are processed, as well as what identity and authentication providers you can configure.

2.1. How SSSD works
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The System Security Services Daemon (SSSD) is a system service that allows you to access remote directories and authentication mechanisms. You can connect a local system, an SSSD client, to an external back-end system, a provider.

Par exemple :

  • An LDAP directory
  • An Identity Management (IdM) domain
  • An Active Directory (AD) domain
  • A Kerberos realm

SSSD works in two stages:

  1. It connects the client to a remote provider to retrieve identity and authentication information.
  2. It uses the obtained authentication information to create a local cache of users and credentials on the client.

Users on the local system are then able to authenticate using the user accounts stored in the remote provider.

SSSD does not create user accounts on the local system. However, SSSD can be configured to create home directories for IdM users. Once created, an IdM user home directory and its contents on the client are not deleted when the user logs out.

Figure 2.1. How SSSD works

A flow chart displaying a local system (an SSSD client) with an
View larger image
A flow chart displaying a local system (an SSSD client) with an

SSSD can also provide caches for several system services, such as Name Service Switch (NSS) or Pluggable Authentication Modules (PAM).

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