documentation:1.4:authldap

LDAP

Authentication Users Password

LL::NG can use an LDAP directory to:

  • authenticate user
  • get user attributes
  • get groups where user is registered
  • change password (with server side password policy management)

This works with every LDAP v2 or v3 server, including Active Directory.

LL::NG is compatible with LDAP password policy:

  • LDAP server can check password strength, and LL::NG portal will display correct errors (password too short, password in history, etc.)
  • LDAP sever can block brute-force attacks, and LL::NG will display that account is locked
  • LDAP server can force password change on first connection, and LL::NG portal will display a password change form before opening SSO session

In Manager, go in General Parameters > Authentication modules and choose LDAP for authentication, users and/or password modules.

For Active Directory, choose Active Directory instead of LDAP.

The authentication level given to users authenticated with this module.

As LDAP is a login/password based module, the authentication level can be:
  • increased (+1) if portal is protected by SSL (HTTPS)
  • decreased (-1) if the portal autocompletion is allowed (see portal customization)

List of attributes to query to fill user session. See also exported variables configuration.

  • Server host: LDAP server hostname or URI (by default: localhost). Accept some specificities:
    • More than one server can be set here separated by spaces or commas. They will be tested in the specified order.
    • To use TLS, set ldap+tls://server and to use LDAPS, set ldaps://server instead of server name.
    • If you use TLS, you can set any of the Net::LDAP start_tls() sub like ldap+tls://server/verify=none&capath=/etc/ssl. You can also use caFile and caPath parameters.
  • Server port: TCP port used by LDAP server. Can be overridden by an LDAP URI in server host.
  • Users search base: Base of search in the LDAP directory.
  • Account: DN used to connect to LDAP server. By default, anonymous bind is used.
  • Password: password to used to connect to LDAP server. By default, anonymous bind is used.
  • Timeout: server idle timeout.
  • Version: LDAP protocol version.
  • Binary attributes: regular expression matching binary attributes (see Net::LDAP documentation).
In LDAP filters, $user is replaced by user login, and $mail by user email.
  • Default filter: default LDAP fitler for searches, should not be modified.
  • Authentication filter: Filter to find user from its login (default: (&(uid=$user)(objectClass=inetOrgPerson)))
  • Mail filter: Filter to find user from its mail (default: (&(mail=$mail)(objectClass=inetOrgPerson)))
For Active Directory, the default authentication filter is:
(&(sAMAccountName=$user)(objectClass=person))

And the mail filter is:

(&(mail=$mail)(objectClass=person))
  • Search base: DN of groups branch. If no value, disable group searching.
  • Object class: objectClass of the groups (default: groupOfNames).
  • Target attribute: name of the attribute in the groups storing the link to the user (default: member).
  • User source attribute: name of the attribute in users entries used in the link (default: dn).
  • Searched attributes: name(s) of the attribute storing the name of the group, spaces separated (default: cn).
  • Recursive: activate recursive group functionality (default: 0). If enabled, if the user group is a member of another group (group of groups), all parents groups will be stored as user's groups.
  • Group source attribute: name of the attribute in groups entries used in the link, for recursive group search (default: dn).
  • Password policy control: enable to use LDAP password policy. This requires at least Net::LDAP 0.38. (see ppolicy workflow below)
  • Password modify extended operation: enable to use the LDAP extended operation password modify instead of standard modify operation.
  • Change as user: enable to perform password modification with credentials of connected user. This requires to request user old password (see portal customization).
  • LDAP password encoding: can allow to manage old LDAP servers using specific encoding for passwords (default: utf-8).
  • Use reset attribute: enable to use the password reset attribute. This attribute is set by LemonLDAP::NG when password was reset by mail and the user choose to generate the password (default: enabled).
  • Reset attribute: name of password reset attribute (default: pwdReset).
  • Reset value: value to set in reset attribute to activate password reset (default: TRUE).

Password expiration warning workflow
Password expiration workflow

Standards attributes, like uid, cn or mail, are often enough to configure access rules and headers.

But sometimes other data are needed (in particular to use extended functions):

  • An application name (to allow access by applications and not by group of users)
  • A start date and an end date (to open or close the service even the entry already exists)
  • A time profile (allowed hours and day of the week)
  • One or more roles (to send to the protected applications)

Of course, standard LDAP attributes can be used to store these data, but LL::NG also provides an LDAP schema extension to manage them.

Extended attributes and object classes use this prefix: 1.3.6.1.4.1.10943.10.2.

The prefix 1.3.6.1.4.1.10943 is owned by LINAGORA (See http://www.iana.org/assignments/enterprise-numbers).

Just add this file to OpenLDAP schemas by including it in slapd.conf:

include /usr/share/lemonldap-ng/ressources/sso.schema

This will provide the auxiliary object class ssoUser with attributes:

  • ssoName
  • ssoRoles
  • ssoLogonHours
  • ssoStartDate
  • ssoEndDate

You can add this object class to any entry of your directory.

To get attributes values in session, declare them in exported variables