1. Set up LDAP Authentication

LDAP authentication is configured by adding a "ShiroProvider" authentication provider to the cluster's topology file. When enabled, the Knox Gateway uses Apache Shiro (org.apache.shiro.realm.ldap.JndiLdapRealm) to authenticate users against the configured LDAP store.

	Note
	Knox Gateway provides HTTP BASIC authentication against an LDAP user directory. It currently supports only a single Organizational Unit (OU) and does not support nested OUs.

To enable LDAP authentication:

Open the cluster topology descriptor file, $cluster-name.xml, in a text editor.
Add the ShiroProvider authentication provider to /topology/gateway as follows:
```
<provider>
   <role>authentication</role>
   <name>ShiroProvider</name>
   <enabled>true</enabled>
   <param>
        <name>main.ldapRealm</name>
        <value>org.apache.shiro.realm.ldap.JndiLdapRealm</value>
   </param>
        <name>main.ldapRealm.userDnTemplate</name>
        <value>$USER_DN</value>
   </param>
        <name>main.ldapRealm.contextFactory.url</name>
        <value>$protocol://$ldaphost:$port</value>
   </param>
        <name>main.ldapRealm.contextFactory.authenticationMechanism</name>
        <value>simple</value>
   </param>
        <name>urls./**</name>
        <value>$auth_type</value>
   </param>
        <name>sessionTimeout</name>
        <value>$minutes</value>
   </param>
 </provider>
```
where the following variables are specific to your environment:
- $USER_DN is a comma separated list of attribute and value pairs that define the User Distinguished Name (DN). The first pair must be set to "$attribute_name={0}" indicating that the $attribute_name is equal to the user token parsed from the request. For example, the first attribute in an OpenLdap definition is UID={0}. The main.ldapRealm.userDnTemplate parameter is only required when authenticating against an LDAP store that requires a full User DN.
- $protocol://$ldaphost:$port is the URL of the LDAP service, Knox Gateway supports LDAP or LDAPS protocols.
- $auth_type is either authcBasic which provides basic authentication for both secured and non-secured requests or ssl, authcBasic which rejects non-secured requests and provides basic authentication of secured requests.
- $minutes is the session idle time in minutes, the default timeout is 30 minutes.
Save the file.
The gateway creates a new WAR file with modified timestamp in /var/lib/knox/data/deployments .

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