NAME
sssd-ldap - the configuration file for SSSD
DESCRIPTION
This manual page describes the configuration of LDAP domains for
sssd(8). Refer to the "FILE FORMAT" section of the sssd.conf(5) manual
page for detailed syntax information.
You can configure SSSD to use more than one LDAP domain.
If you want to authenticate against an LDAP server then TLS/SSL is
required. sssd does not support authentication over an unencrypted
channel. If the LDAP server is used only as an identify provider, an
encrypted channel is not needed.
CONFIGURATION OPTIONS
All of the common configuration options that apply to SSSD domains also
apply to LDAP domains. Refer to the "DOMAIN SECTIONS" section of the
sssd.conf(5) manual page for full details.
ldap_uri (string)
Specifies the list of URIs of the LDAP servers to which SSSD should
connect in the order of preference. Refer to the "FAILOVER" section
for more information on failover and server redundancy. If not
specified, service discovery is enabled. For more information,
refer to the "SERVICE DISCOVERY" section.
ldap_search_base (string)
The default base DN to use for performing LDAP user operations.
ldap_schema (string)
Specifies the Schema Type in use on the target LDAP server.
Depending on the selected schema, the default attribute names
retrieved from the servers may vary. The way that some attributes
are handled may also differ. Two schema types are currently
supported: rfc2307 rfc2307bis The main difference between these two
schema types is how group memberships are recorded in the server.
With rfc2307, group members are listed by name in the memberUid
attribute. With rfc2307bis, group members are listed by DN and
stored in the member attribute.
Default: rfc2307
ldap_default_bind_dn (string)
The default bind DN to use for performing LDAP operations.
ldap_default_authtok_type (string)
The type of the authentication token of the default bind DN. The
only currently supported value is "password".
ldap_default_authtok (string)
The authentication token of the default bind DN. Only clear text
passwords are currently supported.
ldap_user_search_base (string)
An optional base DN to restrict user searches to a specific
subtree.
Default: the value of ldap_search_base
ldap_user_object_class (string)
The object class of a user entry in LDAP.
Default: posixAccount
ldap_user_name (string)
The LDAP attribute that corresponds to the user's login name.
Default: uid
ldap_user_uid_number (string)
The LDAP attribute that corresponds to the user's id.
Default: uidNumber
ldap_user_gid_number (string)
The LDAP attribute that corresponds to the user's primary group id.
Default: gidNumber
ldap_user_gecos (string)
The LDAP attribute that corresponds to the user's gecos field.
Default: gecos
ldap_user_home_directory (string)
The LDAP attribute that contains the name of the user's home
directory.
Default: homeDirectory
ldap_user_shell (string)
The LDAP attribute that contains the path to the user's default
shell.
Default: loginShell
ldap_user_uuid (string)
The LDAP attribute that contains the UUID/GUID of an LDAP user
object.
Default: nsUniqueId
ldap_user_principal (string)
The LDAP attribute that contains the user's Kerberos User Principal
Name (UPN).
Default: krbPrincipalName
ldap_force_upper_case_realm (boolean)
Some directory servers, for example Active Directory, might deliver
the realm part of the UPN in lower case, which might cause the
authentication to fail. Set this option to a non-zero value if you
want to use an upper-case realm.
Default: false
ldap_user_fullname (string)
The LDAP attribute that corresponds to the user's full name.
Default: cn
ldap_user_member_of (string)
The LDAP attribute that lists the user's group memberships.
Default: memberOf
ldap_group_search_base (string)
An optional base DN to restrict group searches to a specific
subtree.
Default: the value of ldap_search_base
ldap_group_object_class (string)
The object class of a group entry in LDAP.
Default: posixGroup
ldap_group_name (string)
The LDAP attribute that corresponds to the group name.
Default: cn
ldap_group_gid_number (string)
The LDAP attribute that corresponds to the group's id.
Default: gidNumber
ldap_group_member (string)
The LDAP attribute that contains the names of the group's members.
Default: memberuid (rfc2307) / member (rfc2307bis)
ldap_group_uuid (string)
The LDAP attribute that contains the UUID/GUID of an LDAP group
object.
Default: nsUniqueId
ldap_search_timeout (integer)
Specifies the timeout (in seconds) that ldap searches are allowed
to run before they are cancelled and cached results are returned
(and offline mode is entered)
Default: 5 (When enumerate = False)
Default: 30 (When enumerate = True - this option will be forced to
a minumum of 30s in this case)
Note: this option is subject to change in future versions of the
SSSD. It will likely be replaced at some point by a series of
timeouts for specific lookup types.
ldap_network_timeout (integer)
Specifies the timeout (in seconds) after which the
poll(2)/select(2) following a connect(2) returns in case of no
activity.
Default: 5
ldap_opt_timeout (integer)
Specifies a timeout (in seconds) after which calls to synchronous
LDAP APIs will abort if no response is received. Also controls the
timeout when communicating with the KDC in case of SASL bind.
Default: 5
ldap_tls_reqcert (string)
Specifies what checks to perform on server certificates in a TLS
session, if any. It can be specified as one of the following
values:
never = The client will not request or check any server
certificate.
allow = The server certificate is requested. If no certificate is
provided, the session proceeds normally. If a bad certificate is
provided, it will be ignored and the session proceeds normally.
try = The server certificate is requested. If no certificate is
provided, the session proceeds normally. If a bad certificate is
provided, the session is immediately terminated.
demand = The server certificate is requested. If no certificate is
provided, or a bad certificate is provided, the session is
immediately terminated.
hard = Same as "demand"
Default: hard
ldap_tls_cacert (string)
Specifies the file that contains certificates for all of the
Certificate Authorities that sssd will recognize.
Default: use OpenLDAP defaults, typically in
/etc/openldap/ldap.conf
ldap_tls_cacertdir (string)
Specifies the path of a directory that contains Certificate
Authority certificates in separate individual files. Typically the
file names need to be the hash of the certificate followed by '.0'.
If available, cacertdir_rehash can be used to create the correct
names.
Default: use OpenLDAP defaults, typically in
/etc/openldap/ldap.conf
ldap_id_use_start_tls (boolean)
Specifies that the id_provider connection must also use tls to
protect the channel.
Default: false
ldap_sasl_mech (string)
Specify the SASL mechanism to use. Currently only GSSAPI is tested
and supported.
Default: none
ldap_sasl_authid (string)
Specify the SASL authorization id to use. When GSSAPI is used, this
represents the Kerberos principal used for authentication to the
directory.
Default: host/machine.fqdn@REALM
ldap_krb5_keytab (string)
Specify the keytab to use when using SASL/GSSAPI.
Default: System keytab, normally /etc/krb5.keytab
ldap_krb5_init_creds (boolean)
Specifies that the id_provider should init Kerberos credentials
(TGT). This action is performed only if SASL is used and the
mechanism selected is GSSAPI.
Default: true
ldap_krb5_ticket_lifetime (integer)
Specifies the lifetime in seconds of the TGT if GSSAPI is used.
Default: 86400 (24 hours)
krb5_realm (string)
Specify the Kerberos REALM (for SASL/GSSAPI auth).
Default: System defaults, see /etc/krb5.conf
ldap_pwd_policy (string)
Select the policy to evaluate the password expiration on the client
side. The following values are allowed:
none - No evaluation on the client side. This option cannot disable
server-side password policies.
shadow - Use shadow(5) style attributes to evaluate if the password
has expired. Note that the current version of sssd cannot update
this attribute during a password change.
mit_kerberos - Use the attributes used by MIT Kerberos to determine
if the password has expired. Use chpass_provider=krb5 to update
these attributes when the password is changed.
Default: none
ldap_referrals (boolean)
Specifies whether automatic referral chasing should be enabled.
Please note that sssd only supports referral chasing when it is
compiled with OpenLDAP version 2.4.13 or higher.
Default: true
ldap_dns_service_name (string)
Specifies the service name to use when service discovery is
enabled.
Default: ldap
ldap_access_filter (string)
If using access_provider = ldap, this option is mandatory. It
specifies an LDAP search filter criteria that must be met for the
user to be granted access on this host. If access_provider = ldap
and this option is not set, it will result in all users being
denied access. Use access_provider = allow to change this default
behavior.
Example:
access_provider = ldap
ldap_access_filter = memberOf=cn=allowedusers,ou=Groups,dc=example,dc=com
This example means that access to this host is restricted to
members of the "allowedusers" group in ldap.
Offline caching for this feature is limited to determining whether
the user's last online login was granted access permission. If they
were granted access during their last login, they will continue to
be granted access while offline and vice-versa.
Default: Empty
FAILOVER
The failover feature allows back ends to automatically switch to a
different server if the primary 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.
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.
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
The name of the SSSD domain is used as the domain part of the service
discovery DNS query.
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
LDAP is set to one of the domains in the [domains] section.
[domain/LDAP]
id_provider = ldap
auth_provider = ldap
ldap_uri = ldap://ldap.mydomain.org
ldap_search_base = dc=mydomain,dc=org
ldap_tls_reqcert = demand
cache_credentials = true
enumerate = true
NOTES
The descriptions of some of the configuration options in this manual
page are based on the ldap.conf(5) manual page from the OpenLDAP 2.4
distribution.
SEE ALSO
sssd.conf(5), sssd-krb5(5), sssd(8)
AUTHORS
The SSSD upstream - http://fedorahosted.org/sssd