[DOCS] Adds missing TLS settings for auditing (#30822)

x-pack/docs/en/security/auditing/forwarding-logs.asciidoc

@@ -1,24 +1,99 @@
 [role="xpack"]
-[float]
 [[forwarding-audit-logfiles]]
-==== Forwarding audit logs to a remote cluster
+=== Forwarding audit logs to a remote cluster
 
-To index audit events to a remote Elasticsearch cluster, you configure
+When you are auditing security events, you can optionally store the logs in an 
-the following `xpack.security.audit.index.client` settings:
+{es} index on a remote cluster.  The logs are sent to the remote cluster by 
+using the {javaclient}/transport-client.html[transport client]. 
 
-* `xpack.security.audit.index.client.hosts`
+. Configure auditing such that the logs are stored in {es} rolling indices. 
-* `xpack.security.audit.index.client.cluster.name`
+See <<audit-index>>. 
-* `xpack.security.audit.index.client.xpack.security.user`
+
+. Establish a connection to the remote cluster by configuring the following 
+`xpack.security.audit.index.client` settings: 
++
+--
+[source, yaml]
+--------------------------------------------------
+xpack.security.audit.index.client.hosts: 192.168.0.1, 192.168.0.2 <1> 
+xpack.security.audit.index.client.cluster.name: logging-prod <2>
+xpack.security.audit.index.client.xpack.security.user: myuser:mypassword <3>
+--------------------------------------------------
+<1> A list of hosts in the remote cluster. If you are not using the default 
+value for the `transport.tcp.port` setting on the remote cluster, you must 
+specify the appropriate port number (prefixed by a colon) after each host. 
+<2> The remote cluster name.
+<3> A valid user and password, which must have authority to create the 
+`.security-audit` index on the remote cluster. 
 
 For more information about these settings, see
-{ref}/auditing-settings.html#remote-audit-settings[Remote Audit Log Indexing Configuration Settings].
+{ref}/auditing-settings.html#remote-audit-settings[Remote audit log indexing configuration settings].
 
-You can pass additional settings to the remote client by specifying them in the
+--
-`xpack.security.audit.index.client` namespace. For example, to allow the remote
-client to discover all of the nodes in the remote cluster you can specify the
-`client.transport.sniff` setting:
 
+. If the remote cluster has Transport Layer Security (TLS/SSL) enabled, you 
+must specify extra security settings: 
+
+.. {ref}/configuring-tls.html#node-certificates[Generate a node certificate on 
+the remote cluster], then copy that certificate to the client. 
+
+.. Enable TLS and specify the information required to access the node certificate.
+
+*** If the signed certificate is in PKCS#12 format, add the following information 
+to the `elasticsearch.yml` file:
++
+--
 [source,yaml]
-----------------------------
+-----------------------------------------------------------
-xpack.security.audit.index.client.transport.sniff: true
+xpack.security.audit.index.client.xpack.security.transport.ssl.enabled: true
-----------------------------
+xpack.security.audit.index.client.xpack.ssl.keystore.path: certs/remote-elastic-certificates.p12 
+xpack.security.audit.index.client.xpack.ssl.truststore.path: certs/remote-elastic-certificates.p12
+-----------------------------------------------------------
+
+For more information about these settings, see 
+{ref}/security-settings.html#auditing-tls-ssl-settings[Auditing TLS settings].
+--
+
+*** If the certificate is in PEM format, add the following information to the
+`elasticsearch.yml` file:
++
+--
+[source, yaml]
+--------------------------------------------------
+xpack.security.audit.index.client.xpack.security.transport.ssl.enabled: true
+xpack.security.audit.index.client.xpack.ssl.key: /home/es/config/audit-client.key 
+xpack.security.audit.index.client.xpack.ssl.certificate: /home/es/config/audit-client.crt 
+xpack.security.audit.index.client.xpack.ssl.certificate_authorities: [ "/home/es/config/remote-ca.crt" ] 
+--------------------------------------------------
+    
+For more information about these settings, see 
+{ref}/security-settings.html#auditing-tls-ssl-settings[Auditing TLS settings].    
+--
+
+.. If you secured the certificate with a password, add the password to
+your {es} keystore:
+
+*** If the signed certificate is in PKCS#12 format, use the following commands:
++
+--
+[source,shell]
+-----------------------------------------------------------
+bin/elasticsearch-keystore add xpack.security.audit.index.client.xpack.ssl.keystore.secure_password
+
+bin/elasticsearch-keystore add xpack.security.audit.index.client.xpack.ssl.truststore.secure_password
+-----------------------------------------------------------
+--
+
+*** If the certificate is in PEM format, use the following commands:
++
+--
+[source,shell]
+-----------------------------------------------------------
+bin/elasticsearch-keystore add xpack.security.audit.index.client.xpack.ssl.secure_key_passphrase
+-----------------------------------------------------------
+--
+
+. Restart {es}.
+
+When these steps are complete, your audit logs are stored in {es} rolling 
+indices on the remote cluster. 

x-pack/docs/en/settings/audit-settings.asciidoc

@@ -130,10 +130,23 @@ Specifies the name of the remote cluster.
 
 `xpack.security.audit.index.client.xpack.security.user`::
 Specifies the `username:password` pair that is used to authenticate with the
-remote cluster.
+remote cluster. This user must have authority to create the `.security-audit` 
+index on the remote cluster. 
+
+If the remote {es} cluster has Transport Layer Security (TLS/SSL) enabled, you 
+must set the following setting to `true`:
+
+`xpack.security.audit.index.client.xpack.security.transport.ssl.enabled`::
+Used to enable or disable TLS/SSL for the transport client that forwards audit 
+logs to the remote cluster. The default is `false`. 
+
+You must also specify the information necessary to access certificates. See 
+<<auditing-tls-ssl-settings>>. 
 
 You can pass additional settings to the remote client by specifying them in the
-`xpack.security.audit.index.client` namespace. For example, to allow the remote
+`xpack.security.audit.index.client` namespace. For example, you can add 
+<<modules-transport,transport settings>> and 
+<<tcp-settings,advanced TCP settings>> in that namespace. To allow the remote
 client to discover all of the nodes in the remote cluster you can specify the
 `client.transport.sniff` setting:
 

x-pack/docs/en/settings/security-settings.asciidoc

@@ -1257,6 +1257,16 @@ transport profile, use the prefix `transport.profiles.$PROFILE.xpack.security.`
 append the portion of the setting after `xpack.security.transport.`. For the key
 setting, this would be `transport.profiles.$PROFILE.xpack.security.ssl.key`.
 
+[[auditing-tls-ssl-settings]]
+:ssl-prefix:             xpack.security.audit.index.client.xpack
+:component:              Auditing
+:client-auth-default!:
+:server!:
+
+include::ssl-settings.asciidoc[]
+
+See also <<remote-audit-settings>>. 
+
 [float]
 [[ip-filtering-settings]]
 ==== IP filtering settings

x-pack/docs/en/settings/ssl-settings.asciidoc

@@ -46,7 +46,6 @@ Java Cryptography Architecture documentation]. Defaults to the value of
 
 The following settings are used to specify a private key, certificate, and the
 trusted certificates that should be used when communicating over an SSL/TLS connection.
-If none of the settings below are specified, the {ref}/security-settings.html#ssl-tls-settings[Default TLS/SSL Settings] are used.
 ifdef::server[]
 A private key and certificate must be configured.
 endif::server[]