sssd-ldap 5 File Formats and Conventions sssd-ldap the configuration file for SSSD 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. LDAP back end supports id, auth, access and chpass providers. If you want to authenticate against an LDAP server either TLS/SSL or LDAPS is required. sssd does not support authentication over an unencrypted channel. If the LDAP server is used only as an identity provider, an encrypted channel is not needed. Please refer to ldap_access_filter config option for more information about using LDAP as an access provider. 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 comma-separated 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. The format of the URI must match the format defined in RFC 2732: ldap[s]://<host>[:port] For explicit IPv6 addresses, <host> must be enclosed in brackets [] example: ldap://[fc00::126:25]:389 ldap_chpass_uri (string) Specifies the list of URIs of the LDAP servers to which SSSD should connect in the order of preference to change the password of a user. Refer to the FAILOVER section for more information on failover and server redundancy. To enable service discovery ldap_chpass_dns_service_name must be set. Default: empty, i.e. ldap_uri is used. ldap_search_base (string) The default base DN to use for performing LDAP user operations. Default: If not set the value of the defaultNamingContext or namingContexts attribute from the RootDSE of the LDAP server is used. If defaultNamingContext does not exists or has an empty value namingContexts is used. The namingContexts attribute must have a single value with the DN of the search base of the LDAP server to make this work. Multiple values are are not supported. 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. Three schema types are currently supported: rfc2307 rfc2307bis IPA The main difference between these 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 and IPA, 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 two mechanisms currently supported are: password obfuscated_password Default: password ldap_default_authtok (string) The authentication token of the default bind DN. Only clear text passwords are currently supported. 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_modify_timestamp (string) The LDAP attribute that contains timestamp of the last modification of the parent object. Default: modifyTimestamp ldap_user_shadow_last_change (string) When using ldap_pwd_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (date of the last password change). Default: shadowLastChange ldap_user_shadow_min (string) When using ldap_pwd_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (minimum password age). Default: shadowMin ldap_user_shadow_max (string) When using ldap_pwd_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (maximum password age). Default: shadowMax ldap_user_shadow_warning (string) When using ldap_pwd_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (password warning period). Default: shadowWarning ldap_user_shadow_inactive (string) When using ldap_pwd_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (password inactivity period). Default: shadowInactive ldap_user_shadow_expire (string) When using ldap_pwd_policy=shadow or ldap_account_expire_policy=shadow, this parameter contains the name of an LDAP attribute corresponding to its shadow 5 counterpart (account expiration date). Default: shadowExpire ldap_user_krb_last_pwd_change (string) When using ldap_pwd_policy=mit_kerberos, this parameter contains the name of an LDAP attribute storing the date and time of last password change in kerberos. Default: krbLastPwdChange ldap_user_krb_password_expiration (string) When using ldap_pwd_policy=mit_kerberos, this parameter contains the name of an LDAP attribute storing the date and time when current password expires. Default: krbPasswordExpiration ldap_user_ad_account_expires (string) When using ldap_account_expire_policy=ad, this parameter contains the name of an LDAP attribute storing the expiration time of the account. Default: accountExpires ldap_user_ad_user_account_control (string) When using ldap_account_expire_policy=ad, this parameter contains the name of an LDAP attribute storing the user account control bit field. Default: userAccountControl ldap_ns_account_lock (string) When using ldap_account_expire_policy=rhds or equivalent, this parameter determines if access is allowed or not. Default: nsAccountLock 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_enumeration_refresh_timeout (integer) The LDAP attribute that contains how many seconds SSSD has to wait before refreshing its cache of enumerated records. Default: 300 ldap_purge_cache_timeout Determine how often to check the cache for inactive entries (such as groups with no members and users who have never logged in) and remove them to save space. Setting this option to zero will disable the cache cleanup operation. Default: 10800 (12 hours) 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_user_authorized_service (string) If access_provider=ldap and ldap_access_order=authorized_service, SSSD will use the presence of the authorizedService attribute in the user's LDAP entry to determine access privilege. An explicit deny (!svc) is resolved first. Second, SSSD searches for explicit allow (svc) and finally for allow_all (*). Default: authorizedService ldap_user_authorized_host (string) If access_provider=ldap and ldap_access_order=host, SSSD will use the presence of the host attribute in the user's LDAP entry to determine access privilege. An explicit deny (!host) is resolved first. Second, SSSD searches for explicit allow (host) and finally for allow_all (*). Default: host 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_group_modify_timestamp (string) The LDAP attribute that contains timestamp of the last modification of the parent object. Default: modifyTimestamp ldap_group_nesting_level (integer) If ldap_schema is set to a schema format that supports nested groups (e.g. RFC2307bis), then this option controls how many levels of nesting SSSD will follow. This option has no effect on the RFC2307 schema. Default: 2 ldap_netgroup_object_class (string) The object class of a netgroup entry in LDAP. Default: nisNetgroup ldap_netgroup_name (string) The LDAP attribute that corresponds to the netgroup name. Default: cn ldap_netgroup_member (string) The LDAP attribute that contains the names of the netgroup's members. Default: memberNisNetgroup ldap_netgroup_triple (string) The LDAP attribute that contains the (host, user, domain) netgroup triples. Default: nisNetgroupTriple ldap_netgroup_uuid (string) The LDAP attribute that contains the UUID/GUID of an LDAP netgroup object. Default: nsUniqueId ldap_netgroup_modify_timestamp (string) The LDAP attribute that contains timestamp of the last modification of the parent object. Default: modifyTimestamp 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) 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. Default: 6 ldap_enumeration_search_timeout (integer) Specifies the timeout (in seconds) that ldap searches for user and group enumerations are allowed to run before they are cancelled and cached results are returned (and offline mode is entered) Default: 60 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: 6 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: 6 ldap_page_size (integer) Specify the number of records to retrieve from LDAP in a single request. Some LDAP servers enforce a maximum limit per-request. Default: 1000 ldap_deref_threshold (integer) Specify the number of group members that must be missing from the internal cache in order to trigger a dereference lookup. If less members are missing, they are looked up individually. A dereference lookup is a means of fetching all group members in a single LDAP call. Different LDAP servers may implement different dereference methods. The currently supported servers are 389/RHDS, OpenLDAP and Active Directory. Default: 10 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_tls_cert (string) Specifies the file that contains the certificate for the client's key. Default: not set ldap_tls_key (string) Specifies the file that contains the client's key. Default: not set ldap_tls_cipher_suite (string) Specifies acceptable cipher suites. Typically this is a colon sperated list. See ldap.conf 5 for format. 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_server (string) Specifies the list of IP addresses or hostnames of the Kerberos servers to which SSSD should connect in the order of preference. For more information on failover and server redundancy, see the FAILOVER section. An optional port number (preceded by a colon) may be appended to the addresses or hostnames. If empty, service discovery is enabled - for more information, refer to the SERVICE DISCOVERY section. When using service discovery for KDC or kpasswd servers, SSSD first searches for DNS entries that specify _udp as the protocol and falls back to _tcp if none are found. This option was named krb5_kdcip in earlier releases of SSSD. While the legacy name is recognized for the time being, users are advised to migrate their config files to use krb5_server instead. 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_chpass_dns_service_name (string) Specifies the service name to use to find an LDAP server which allows password changes when service discovery is enabled. Default: not set, i.e. service discovery is disabled 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 ldap_account_expire_policy (string) With this option a client side evaluation of access control attributes can be enabled. Please note that it is always recommended to use server side access control, i.e. the LDAP server should deny the bind request with a suitable error code even if the password is correct. The following values are allowed: shadow: use the value of ldap_user_shadow_expire to determine if the account is expired. ad: use the value of the 32bit field ldap_user_ad_user_account_control and allow access if the second bit is not set. If the attribute is missing access is granted. Also the expiration time of the account is checked. rhds, ipa, 389ds: use the value of ldap_ns_account_lock to check if access is allowed or not. Default: Empty ldap_access_order (string) Comma separated list of access control options. Allowed values are: filter: use ldap_access_filter expire: use ldap_account_expire_policy authorized_service: use the authorizedService attribute to determine access host: use the host attribute to determine access Default: filter Please note that it is a configuration error if a value is used more than once. ldap_deref (string) Specifies how alias dereferencing is done when performing a search. The following options are allowed: never: Aliases are never dereferenced. searching: Aliases are dereferenced in subordinates of the base object, but not in locating the base object of the search. finding: Aliases are only dereferenced when locating the base object of the search. always: Aliases are dereferenced both in searching and in locating the base object of the search. Default: Empty (this is handled as never by the LDAP client libraries) These options are supported by LDAP domains, but they should be used with caution. Please include them in your configuration only if you know what you are doing. ldap_netgroup_search_base (string) An optional base DN to restrict netgroup searches to a specific subtree. Default: the value of ldap_search_base 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_group_search_base (string) An optional base DN to restrict group searches to a specific subtree. Default: the value of ldap_search_base ldap_user_search_filter (string) This option specifies an additional LDAP search filter criteria that restrict user searches. Default: not set Example: ldap_user_search_filter = (loginShell=/bin/tcsh) This filter would restrict user searches to users that have their shell set to /bin/tcsh. ldap_group_search_filter (string) This option specifies an additional LDAP search filter criteria that restrict group searches. Default: not set 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 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. sssd.conf5 , sssd-krb55 , sssd8