Add docs on all available console server config options (#9288)

docs/console.asciidoc

@@ -83,4 +83,4 @@ include::console/history.asciidoc[]
 
 include::console/settings.asciidoc[]
 
-include::console/disabling-console.asciidoc[]
+include::console/configuring-console.asciidoc[]

docs/console/configuring-console.asciidoc

@@ -0,0 +1,57 @@
+[[configuring-console]]
+== Configuring Console
+
+You can add the following options in the `config/kibana.yml` file:
+
+`console.enabled`:: *Default: true* Set to false to disable Console. Toggling this will cause the server to regenerate assets on the next startup, which may cause a delay before pages start being served.
+
+`console.proxyFilter`:: *Default: `.*`* A list of regular expressions that are used to validate any outgoing request from Console. If none
+ of these match, the request will be rejected. See <<securing-console>> for more details.
+
+`console.proxyConfig`:: A list of configuration options that are based on the proxy target. Use this to set custom timeouts or SSL settings for specific hosts. This is done by defining a set of `match` criteria using wildcards/globs which will be checked against each request. The configuration from all matching rules will then be merged together to configure the proxy used for that request.
++
+The valid match keys are `match.protocol`, `match.host`, `match.port`, and `match.path`. All of these keys default to `*`, which means they will match any value.
++
+Example:
++
+[source,yaml]
+--------
+console.proxyConfig:
+  - match:
+      host: "*.internal.org" # allow any host that ends in .internal.org
+      port: "{9200..9299}" # allow any port from 9200-9299
+
+    ssl:
+      ca: "/opt/certs/internal.ca"
+      # "key" and "cert" are also valid options here
+
+  - match:
+      protocol: "https"
+
+    ssl:
+      verify: false # allows any certificate to be used, even self-signed certs
+
+  # since this rule has no "match" section it matches everything
+  - timeout: 180000 # 3 minutes
+--------
+
+[[securing-console]]
+=== Securing Console
+
+Console is meant to be used as a local development tool. As such, it will send requests to any host & port combination,
+just as a local curl command would. To overcome the CORS limitations enforced by browsers, Console's Node.js backend
+serves as a proxy to send requests on behalf of the browser. However, if put on a server and exposed to the internet
+this can become a security risk. In those cases, we highly recommend you lock down the proxy by setting the
+`console.proxyFilter` setting. The setting accepts a list of regular expressions that are evaluated against each URL
+ the proxy is requested to retrieve. If none of the regular expressions match the proxy will reject the request.
+
+Here is an example configuration the only allows Console to connect to localhost:
+
+[source,yaml]
+--------
+console.proxyFilter:
+  - ^https?://(localhost|127\.0\.0\.1|\[::0\]).*
+--------
+
+You will need to restart Kibana for these changes to take effect.
+

docs/setup/settings.asciidoc

@@ -65,3 +65,7 @@ The minimum value is 100.
 `status.allowAnonymous`:: *Default: false* If authentication is enabled, setting this to `true` allows
 unauthenticated users to access the Kibana server status API and status page.
 `console.enabled`:: *Default: true* Set to false to disable Console.  Toggling this will cause the server to regenerate assets on the next startup, which may cause a delay before pages start being served.
+`console.proxyFilter`:: *Default: `.*`* A list of regular expressions that are used to validate any outgoing request from Console. If none of these match, the request will be rejected.
+`console.proxyConfig`:: A list of configuration options that are based on the proxy target. Use this to set custom timeouts or SSL settings for specific hosts. This is done by defining a set of `match` criteria using wildcards/globs which will be checked against each request. The configuration from all matching rules will then be merged together to configure the proxy used for that request.
++
+The valid match keys are `match.protocol`, `match.host`, `match.port`, and `match.path`. All of these keys default to `*`, which means they will match any value. See <<configuring-console>> for an example.