LDAP

Authentication Users Password

Presentation

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

Configuration

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

Tip

For Active Directory, choose Active Directory instead of LDAP.

Authentication level

The authentication level given to users authenticated with this module.

Attention

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)

Exported variables

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

Connection

  • 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 if different from the standard ports. Can also be specified in the server host URI.
  • Verify LDAP server certificate: It is highly recommended to verify the identity of the remote server. This setting is only enforced for LDAPS or TLS connections.
  • 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.
  • Connection timeout: applies only when initiating the connection
  • Operation timeout: applies to all LDAP operations
  • Version: LDAP protocol version.
  • Binary attributes: regular expression matching binary attributes (see Net::LDAP documentation).
  • CA file path: This allows you to override the default system-wide certificate authorities by giving a single file containing the CA used by the LDAP server.
  • CA directory path: This allows you to override the default system-wide certificate authorities by giving the path of a directory containing your trusted certificates.

Attention

LemonLDAP::NG need anonymous access to LDAP Directory RootDSE in order to check LDAP connection.

Filters

Tip

In LDAP filters, $user is replaced by user login, and $mail by user email.

  • Default filter: default LDAP filter 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)))
  • Alias dereference: How to manage LDAP aliases. (default: find)

Tip

For Active Directory, the default authentication filter is:

(&(sAMAccountName=$user)(objectClass=person))

And the mail filter is:

(&(mail=$mail)(objectClass=person))

Groups

  • 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).
  • Decode searched value: with Active Directory, member DN value is sometimes bad decoded and groups are not found, activate this option to force value decoding.
  • 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).

Note

The groups that the user belongs to are available as $groups and %hGroups, as documented here

Attention

If your LDAP countains over a thousand groups, you should avoid using group processing, check out the performance page for alternatives

Password

  • 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 one 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).
  • Allow a user to reset his expired password: if activated, the user will be prompted to change password if his password is expired (default: disabled)
  • Search for user before password change: this option forces the password
    change module to search for the user again, refreshing its DN. This feature is only useful in rare cases when you use LDAP as the password module, but not as the UserDB module. (default: enabled)
  • IBM Tivoli DS support: enable this option if you use ITDS. LL::NG will then scan error message to return a more precise error to the user.

Password expiration warning workflow image0 Password expiration workflow image1