Version: 6.x-23
Enterprise

Active Directory and LDAP Authentication

Activating Authentication

To use Active Directory / LDAP for authentication first configure a respective authentication domain in the authc section of sg_config:

authc:
  ldap:
    enabled: true
    order: 1
    http_authenticator:
      type: basic
      challenge: true
    authentication_backend:
      type: ldap
      config:
        ...

Afterwards add the connection settings for your Active Directory / LDAP server to the config section of the authentication domain, e.g.:

config:
  enable_ssl: true
  enable_start_tls: false
  enable_ssl_client_auth: false
  verify_hostnames: true
  hosts:
    - ldap.example.com:8389
  bind_dn: cn=admin,dc=example,dc=com
  password: passw0rd

Configuring Authentication

Authentication works by issuing an LDAP query containing the username against the user subtree of the LDAP tree.

Search Guard first takes the configured LDAP query, and replaces the placeholder {0} with the username from the user’s credentials.

usersearch: '(sAMAccountName={0})'

Search Guard then issues this query against the user subtree (“userbase”). Currently the whole subtree beneath the configured userbase is searched:

userbase: 'ou=people,dc=example,dc=com'

If the query was successful, Search Guard retrieves the username from the LDAP entry. You can specify which attribute from the LDAP entry Search Guard should use as the username:

username_attribute: uid

If this key is not set, or null, then the DN of the LDAP entry is used.

Configuration summary

Name Description
userbase Specifies the subtree in the directory where user information is stored
usersearch The actual LDAP query that Search Guard executes when trying to authenticate a user. The variable {0} is substituted with the username.
username_attribute Search Guard uses this attribute of the directory entry to look for the user name. If set to null, the DN is used (default).

Complete authentication example

ldap:
  enabled: false
  order: 1
  http_authenticator:
    type: basic
    challenge: true
  authentication_backend:
    type: ldap
    config:
      enable_ssl: true
      enable_start_tls: false
      enable_ssl_client_auth: false
      verify_hostnames: true
      hosts:
        - ldap.example.com:636
      bind_dn: cn=admin,dc=example,dc=com
      password: password
      userbase: 'ou=people,dc=example,dc=com'
      usersearch: '(sAMAccountName={0})'
      username_attribute: uid