table of contents
SSSD-IPA(5) | File Formats and Conventions | SSSD-IPA(5) |
NAME¶
sssd-ipa - the configuration file for SSSDDESCRIPTION¶
This manual page describes the configuration of the IPA provider for sssd(8). For a detailed syntax reference, refer to the “FILE FORMAT” section of the sssd.conf(5) manual page. The IPA provider is a back end used to connect to an IPA server. (Refer to the freeipa.org web site for information about IPA servers.) This provider requires that the machine be joined to the IPA domain; configuration is almost entirely self-discovered and obtained directly from the server. The IPA provider accepts the same options used by the sssd-ldap(5) identity provider and the sssd-krb5(5) authentication provider with some exceptions described below. However, it is neither necessary nor recommended to set these options. IPA provider can also be used as an access and chpass provider. As an access provider it uses HBAC (host-based access control) rules. Please refer to freeipa.org for more information about HBAC. No configuration of access provider is required on the client side. The IPA provider will use the PAC responder if the Kerberos tickets of users from trusted realms contain a PAC. To make configuration easier the PAC responder is started automatically if the IPA ID provider is configured.CONFIGURATION OPTIONS¶
Refer to the section “DOMAIN SECTIONS” of the sssd.conf(5) manual page for details on the configuration of an SSSD domain. ipa_domain (string)Specifies the name of the IPA domain. This is optional.
If not provided, the configuration domain name is used.
ipa_server, ipa_backup_server (string)
The comma-separated list of IP addresses or hostnames of
the IPA servers to which SSSD should connect in the order of preference. For
more information on failover and server redundancy, see the
“FAILOVER” section. This is optional if autodiscovery is
enabled. For more information on service discovery, refer to the
“SERVICE DISCOVERY” section.
ipa_hostname (string)
Optional. May be set on machines where the hostname(5)
does not reflect the fully qualified name used in the IPA domain to identify
this host.
dyndns_update (boolean)
Optional. This option tells SSSD to automatically update
the DNS server built into FreeIPA v2 with the IP address of this client. The
update is secured using GSS-TSIG. The IP address of the IPA LDAP connection is
used for the updates, if it is not otherwise specified by using the
“dyndns_iface” option.
NOTE: On older systems (such as RHEL 5), for this behavior to work reliably, the
default Kerberos realm must be set properly in /etc/krb5.conf
NOTE: While it is still possible to use the old ipa_dyndns_update option,
users should migrate to using dyndns_update in their config file.
Default: false
dyndns_ttl (integer)
The TTL to apply to the client DNS record when updating
it. If dyndns_update is false this has no effect. This will override the TTL
serverside if set by an administrator.
NOTE: While it is still possible to use the old ipa_dyndns_ttl option,
users should migrate to using dyndns_ttl in their config file.
Default: 1200 (seconds)
dyndns_iface (string)
Optional. Applicable only when dyndns_update is true.
Choose the interface whose IP address should be used for dynamic DNS updates.
NOTE: While it is still possible to use the old ipa_dyndns_iface option,
users should migrate to using dyndns_iface in their config file.
Default: Use the IP address of the IPA LDAP connection
ipa_enable_dns_sites (boolean)
Enables DNS sites - location based service discovery.
If true and service discovery (see Service Discovery paragraph at the bottom of
the man page) is enabled, then the SSSD will first attempt location based
discovery using a query that contains
"_location.hostname.example.com" and then fall back to traditional
SRV discovery. If the location based discovery succeeds, the IPA servers
located with the location based discovery are treated as primary servers and
the IPA servers located using the traditional SRV discovery are used as back
up servers
Default: false
dyndns_refresh_interval (integer)
How often should the back end perform periodic DNS update
in addition to the automatic update performed when the back end goes online.
This option is optional and applicable only when dyndns_update is true.
Default: 0 (disabled)
dyndns_update_ptr (bool)
Whether the PTR record should also be explicitly updated
when updating the client's DNS records. Applicable only when dyndns_update is
true.
This option should be False in most IPA deployments as the IPA server generates
the PTR records automatically when forward records are changed.
Default: False (disabled)
dyndns_force_tcp (bool)
Whether the nsupdate utility should default to using TCP
for communicating with the DNS server.
Default: False (let nsupdate choose the protocol)
ipa_hbac_search_base (string)
Optional. Use the given string as search base for HBAC
related objects.
Default: Use base DN
ipa_host_search_base (string)
Optional. Use the given string as search base for host
objects.
See “ldap_search_base” for information about configuring multiple
search bases.
If filter is given in any of search bases and ipa_hbac_support_srchost is
set to False, the filter will be ignored.
Default: the value of ldap_search_base
ipa_selinux_search_base (string)
Optional. Use the given string as search base for SELinux
user maps.
See “ldap_search_base” for information about configuring multiple
search bases.
Default: the value of ldap_search_base
ipa_subdomains_search_base (string)
Optional. Use the given string as search base for trusted
domains.
See “ldap_search_base” for information about configuring multiple
search bases.
Default: the value of cn=trusts,%basedn
ipa_master_domain_search_base (string)
Optional. Use the given string as search base for master
domain object.
See “ldap_search_base” for information about configuring multiple
search bases.
Default: the value of cn=ad,cn=etc,%basedn
krb5_validate (boolean)
Verify with the help of krb5_keytab that the TGT obtained
has not been spoofed.
Default: true
Note that this default differs from the traditional Kerberos provider back
end.
krb5_realm (string)
The name of the Kerberos realm. This is optional and
defaults to the value of “ipa_domain”.
The name of the Kerberos realm has a special meaning in IPA - it is converted
into the base DN to use for performing LDAP operations.
krb5_canonicalize (boolean)
Specifies if the host and user principal should be
canonicalized when connecting to IPA LDAP and also for AS requests. This
feature is available with MIT Kerberos >= 1.7
Default: true
krb5_use_fast (string)
Enables flexible authentication secure tunneling (FAST)
for Kerberos pre-authentication. The following options are supported:
never use FAST.
try to use FAST. If the server does not support FAST, continue the
authentication without it. This is equivalent to not setting this option at
all.
demand to use FAST. The authentication fails if the server does not
require fast.
Default: try
NOTE: SSSD supports FAST only with MIT Kerberos version 1.8 and later. If SSSD
is used with an older version of MIT Kerberos, using this option is a
configuration error.
ipa_hbac_refresh (integer)
The amount of time between lookups of the HBAC rules
against the IPA server. This will reduce the latency and load on the IPA
server if there are many access-control requests made in a short period.
Default: 5 (seconds)
ipa_hbac_selinux (integer)
The amount of time between lookups of the SELinux maps
against the IPA server. This will reduce the latency and load on the IPA
server if there are many user login requests made in a short period.
Default: 5 (seconds)
ipa_hbac_treat_deny_as (string)
This option specifies how to treat the deprecated
DENY-type HBAC rules. As of FreeIPA v2.1, DENY rules are no longer supported
on the server. All users of FreeIPA will need to migrate their rules to use
only the ALLOW rules. The client will support two modes of operation during
this transition period:
DENY_ALL: If any HBAC DENY rules are detected, all users will be denied
access.
IGNORE: SSSD will ignore any DENY rules. Be very careful with this
option, as it may result in opening unintended access.
Default: DENY_ALL
ipa_hbac_support_srchost (boolean)
If this is set to false, then srchost as given to SSSD by
PAM will be ignored.
Note that if set to False, this option casuses filters given in
ipa_host_search_base to be ignored;
Default: false
ipa_server_mode (boolean)
This option should only be set by the IPA installer.
The option denotes that the SSSD is running on IPA server and should perform
lookups of users and groups from trusted domains differently.
Default: false
ipa_automount_location (string)
The automounter location this IPA client will be using
Default: The location named "default"
Please note that the automounter only reads the master map on startup, so if any
autofs-related changes are made to the sssd.conf, you typically also need to
restart the automounter daemon after restarting the SSSD.
ipa_netgroup_member_of (string)
The LDAP attribute that lists netgroup's memberships.
Default: memberOf
ipa_netgroup_member_user (string)
The LDAP attribute that lists system users and groups
that are direct members of the netgroup.
Default: memberUser
ipa_netgroup_member_host (string)
The LDAP attribute that lists hosts and host groups that
are direct members of the netgroup.
Default: memberHost
ipa_netgroup_member_ext_host (string)
The LDAP attribute that lists FQDNs of hosts and host
groups that are members of the netgroup.
Default: externalHost
ipa_netgroup_domain (string)
The LDAP attribute that contains NIS domain name of the
netgroup.
Default: nisDomainName
ipa_host_object_class (string)
The object class of a host entry in LDAP.
Default: ipaHost
ipa_host_fqdn (string)
The LDAP attribute that contains FQDN of the host.
Default: fqdn
ipa_selinux_usermap_object_class (string)
The object class of a host entry in LDAP.
Default: ipaHost
ipa_selinux_usermap_name (string)
The LDAP attribute that contains the name of SELinux
usermap.
Default: cn
ipa_selinux_usermap_member_user (string)
The LDAP attribute that contains all users / groups this
rule match against.
Default: memberUser
ipa_selinux_usermap_member_host (string)
The LDAP attribute that contains all hosts / hostgroups
this rule match against.
Default: memberHost
ipa_selinux_usermap_see_also (string)
The LDAP attribute that contains DN of HBAC rule which
can be used for matching instead of memberUser and memberHost
Default: seeAlso
ipa_selinux_usermap_selinux_user (string)
The LDAP attribute that contains SELinux user string
itself.
Default: ipaSELinuxUser
ipa_selinux_usermap_enabled (string)
The LDAP attribute that contains whether or not is user
map enabled for usage.
Default: ipaEnabledFlag
ipa_selinux_usermap_user_category (string)
The LDAP attribute that contains user category such as
'all'.
Default: userCategory
ipa_selinux_usermap_host_category (string)
The LDAP attribute that contains host category such as
'all'.
Default: hostCategory
ipa_selinux_usermap_uuid (string)
The LDAP attribute that contains unique ID of the user
map.
Default: ipaUniqueID
ipa_host_ssh_public_key (string)
The LDAP attribute that contains the host's SSH public
keys.
Default: ipaSshPubKey
SUBDOMAINS PROVIDER¶
The IPA subdomains provider behaves slightly differently if it is configured explicitly or implicitly. If the option 'subdomains_provider = ipa' is found in the domain section of sssd.conf, the IPA subdomains provider is configured explicitly, and all subdomain requests are sent to the IPA server if necessary. If the option 'subdomains_provider' is not set in the domain section of sssd.conf but there is the option 'id_provider = ipa', the IPA subdomains provider is configured implicitly. In this case, if a subdomain request fails and indicates that the server does not support subdomains, i.e. is not configured for trusts, the IPA subdomains provider is disabled. After an hour or after the IPA provider goes online, the subdomains provider is enabled again.FAILOVER¶
The failover feature allows back ends to automatically switch to a different server if the current server fails.Failover Syntax¶
The list of servers is given as a comma-separated list; any number of spaces is allowed around the comma. The servers are listed in order of preference. The list can contain any number of servers. For each failover-enabled config option, two variants exist: primary and backup. The idea is that servers in the primary list are preferred and backup servers are only searched if no primary servers can be reached. If a backup server is selected, a timeout of 31 seconds is set. After this timeout SSSD will periodically try to reconnect to one of the primary servers. If it succeeds, it will replace the current active (backup) server.The Failover Mechanism¶
The failover mechanism distinguishes between a machine and a service. The back end first tries to resolve the hostname of a given machine; if this resolution attempt fails, the machine is considered offline. No further attempts are made to connect to this machine for any other service. If the resolution attempt succeeds, the back end tries to connect to a service on this machine. If the service connection attempt fails, then only this particular service is considered offline and the back end automatically switches over to the next service. The machine is still considered online and might still be tried for another service. Further connection attempts are made to machines or services marked as offline after a specified period of time; this is currently hard coded to 30 seconds. If there are no more machines to try, the back end as a whole switches to offline mode, and then attempts to reconnect every 30 seconds.SERVICE DISCOVERY¶
The service discovery feature allows back ends to automatically find the appropriate servers to connect to using a special DNS query. This feature is not supported for backup servers.Configuration¶
If no servers are specified, the back end automatically uses service discovery to try to find a server. Optionally, the user may choose to use both fixed server addresses and service discovery by inserting a special keyword, “_srv_”, in the list of servers. The order of preference is maintained. This feature is useful if, for example, the user prefers to use service discovery whenever possible, and fall back to a specific server when no servers can be discovered using DNS.The domain name¶
Please refer to the “dns_discovery_domain” parameter in the sssd.conf(5) manual page for more details.The protocol¶
The queries usually specify _tcp as the protocol. Exceptions are documented in respective option description.See Also¶
For more information on the service discovery mechanism, refer to RFC 2782.EXAMPLE¶
The following example assumes that SSSD is correctly configured and example.com is one of the domains in the [sssd] section. This examples shows only the ipa provider-specific options.[domain/example.com] id_provider = ipa ipa_server = ipaserver.example.com ipa_hostname = myhost.example.com
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).AUTHORS¶
The SSSD upstream - http://fedorahosted.org/sssd01/16/2015 | SSSD |