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sssd-sudo(5)


NAME

   sssd-sudo - Configuring sudo with the SSSD back end

DESCRIPTION

   This manual page describes how to configure sudo(8) to work with
   sssd(8) and how SSSD caches sudo rules.

CONFIGURING SUDO TO COOPERATE WITH SSSD

   To enable SSSD as a source for sudo rules, add sss to the sudoers entry
   in nsswitch.conf(5).

   For example, to configure sudo to first lookup rules in the standard
   sudoers(5) file (which should contain rules that apply to local users)
   and then in SSSD, the nsswitch.conf file should contain the following
   line:

       sudoers: files sss

   More information about configuring the sudoers search order from the
   nsswitch.conf file as well as information about the LDAP schema that is
   used to store sudo rules in the directory can be found in
   sudoers.ldap(5).

   Note: in order to use netgroups or IPA hostgroups in sudo rules, you
   also need to correctly set nisdomainname(1) to your NIS domain name
   (which equals to IPA domain name when using hostgroups).

CONFIGURING SSSD TO FETCH SUDO RULES

   All configuration that is needed on SSSD side is to extend the list of
   services with "sudo" in [sssd] section of sssd.conf(5). To speed up the
   LDAP lookups, you can also set search base for sudo rules using
   ldap_sudo_search_base option.

   The following example shows how to configure SSSD to download sudo
   rules from an LDAP server.

       [sssd]
       config_file_version = 2
       services = nss, pam, sudo
       domains = EXAMPLE

       [domain/EXAMPLE]
       id_provider = ldap
       sudo_provider = ldap
       ldap_uri = ldap://example.com
       ldap_sudo_search_base = ou=sudoers,dc=example,dc=com

   When the SSSD is configured to use IPA as the ID provider, the sudo
   provider is automatically enabled. The sudo search base is configured
   to use the compat tree (ou=sudoers,$DC).

THE SUDO RULE CACHING MECHANISM

   The biggest challenge, when developing sudo support in SSSD, was to
   ensure that running sudo with SSSD as the data source provides the same
   user experience and is as fast as sudo but keeps providing the most
   current set of rules as possible. To satisfy these requirements, SSSD
   uses three kinds of updates. They are referred to as full refresh,
   smart refresh and rules refresh.

   The smart refresh periodically downloads rules that are new or were
   modified after the last update. Its primary goal is to keep the
   database growing by fetching only small increments that do not generate
   large amounts of network traffic.

   The full refresh simply deletes all sudo rules stored in the cache and
   replaces them with all rules that are stored on the server. This is
   used to keep the cache consistent by removing every rule which was
   deleted from the server. However, full refresh may produce a lot of
   traffic and thus it should be run only occasionally depending on the
   size and stability of the sudo rules.

   The rules refresh ensures that we do not grant the user more permission
   than defined. It is triggered each time the user runs sudo. Rules
   refresh will find all rules that apply to this user, check their
   expiration time and redownload them if expired. In the case that any of
   these rules are missing on the server, the SSSD will do an out of band
   full refresh because more rules (that apply to other users) may have
   been deleted.

   If enabled, SSSD will store only rules that can be applied to this
   machine. This means rules that contain one of the following values in
   sudoHost attribute:

   *   keyword ALL

   *   wildcard

   *   netgroup (in the form "+netgroup")

   *   hostname or fully qualified domain name of this machine

   *   one of the IP addresses of this machine

   *   one of the IP addresses of the network (in the form "address/mask")

   There are many configuration options that can be used to adjust the
   behavior. Please refer to "ldap_sudo_*" in sssd-ldap(5) and "sudo_*" in
   sssd.conf(5).

SEE ALSO

   sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5),
   sssd-ipa(5), sssd-ad(5), sssd-sudo(5), sss_cache(8), sss_debuglevel(8),
   sss_groupadd(8), sss_groupdel(8), sss_groupshow(8), sss_groupmod(8),
   sss_useradd(8), sss_userdel(8), sss_usermod(8), sss_obfuscate(8),
   sss_seed(8), sssd_krb5_locator_plugin(8), sss_ssh_authorizedkeys(8),
   sss_ssh_knownhostsproxy(8), sssd-ifp(5), pam_sss(8).  sss_rpcidmapd(5)

AUTHORS

   The SSSD upstream - http://fedorahosted.org/sssd



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