[DOCS] Adds certutil http command to TLS setup steps (#51241)

Co-Authored-By: Ioannis Kakavas <ikakavas@protonmail.com>
Co-Authored-By: Tim Vernum <tim@adjective.org>

x-pack/docs/en/security/securing-communications/node-certificates.asciidoc

@@ -1,5 +1,5 @@
 [[node-certificates]]
-==== Generating Node Certificates
+==== Generating node certificates
 
 TLS requires X.509 certificates to perform encryption and authentication of the
 application that is being communicated with. In order for the communication
@@ -75,12 +75,27 @@ signing requests (CSR) for the nodes in your cluster. For more information, see
 <<certutil>>.
 --
 
-. Copy the node certificate to the appropriate locations.
+. Optional: Generate additional certificates specifically for encrypting HTTP
+client communications. 
 +
 --
-Copy the applicable `.p12` file into a directory within the {es} configuration
+For example, use the `elasticsearch-certutil http` command:
-directory on each node. For example, `/home/es/config/certs`. There is no need
+
-to copy the CA file to this directory.
+[source,shell]
+----------------------------------------------------------
+bin/elasticsearch-certutil http
+----------------------------------------------------------
+
+This command guides you through the process of generating the appropriate
+certificates for use in {es} and {kib}. If you created a CA for your cluster,
+you can re-use it by supplying its location when prompted.
+--
+
+. Copy the node certificates to the appropriate locations.
++
+--
+Copy the applicable files into the {es} configuration directory on each
+node.
 
 For each additional Elastic product that you want to configure, copy the
 certificates to the relevant configuration directory. 

x-pack/docs/en/security/securing-communications/tls-http.asciidoc

@@ -1,47 +1,63 @@
 [role="xpack"]
 [[tls-http]]
-==== Encrypting HTTP Client communications
+==== Encrypting HTTP client communications
 
 When {security-features} are enabled, you can optionally use TLS to ensure that
 communication between HTTP clients and the cluster is encrypted.
 
 NOTE: Enabling TLS on the HTTP layer is strongly recommended but is not required.
 If you enable TLS on the HTTP layer in {es}, then you might need to make
-configuration changes in other parts of the Elastic Stack and in any {es}
+configuration changes in other parts of the {stack} and in any {es} clients that
-clients that you use.
+you use.
 
 . If you have not done so already, <<node-certificates,generate node certificates>>.
++
+--
+In particular, you need the files that are generated by the following command:
+
+[source,shell]
+----------------------------------------------------------
+bin/elasticsearch-certutil http
+----------------------------------------------------------
+
+This command generates a zip file that contains certificates and keys for use in
+{es} and {kib}. Each folder contains a readme that explains how to use the files.
+--
+
+. Verify that you've copied the output files to the appropriate locations, as
+specified in the readme files. 
++
+--
+For example, copy the `http.p12` file from the `elasticsearch` folder into a 
+directory within the {es} configuration directory on each node. If you chose to 
+generate one certificate per node, copy the appropriate `http.p12` file to each
+node. If you want to use {kib} to access this cluster, copy the
+`elasticsearch-ca.pem` file from the `kibana` folder into the {kib}
+configuration directory.
+--
 
 . Enable TLS and specify the information required to access the node’s
-certificate.
+certificate. For example:
 
-** If the certificate is in PKCS#12 format, add the following information to the
+.. Update the `elasticsearch.yml` file on each node with the location of the
-`elasticsearch.yml` file on each node:
+certificates.
 +
 --
+If the certificates are in PKCS#12 format:
+
 [source, yaml]
 --------------------------------------------------
 xpack.security.http.ssl.enabled: true
-xpack.security.http.ssl.keystore.path: certs/elastic-certificates.p12 <1>
+xpack.security.http.ssl.keystore.path: "http.p12"
-xpack.security.http.ssl.truststore.path: certs/elastic-certificates.p12 <2>
 --------------------------------------------------
-<1> If you created a separate certificate for each node, then you might need to
-customize this path on each node. If the filename matches the node name, you can
-use the `certs/${node.name}.p12` format, for example.
-<2> The `elasticsearch-certutil` output includes the CA certificate inside the
-PKCS#12 keystore, therefore the keystore can also be used as the truststore.
-This name should match the `keystore.path` value.
---
 
-** If the certificate is in PEM format, add the following information to the
+If you have certificates in PEM format:
-`elasticsearch.yml` file on each node:
+
-+
---
 [source, yaml]
 --------------------------------------------------
 xpack.security.http.ssl.enabled: true
-xpack.security.http.ssl.key:  /home/es/config/node01.key <1>
+xpack.security.http.ssl.key:  /home/es/config/node1_http.key <1>
-xpack.security.http.ssl.certificate: /home/es/config/node01.crt <2>
+xpack.security.http.ssl.certificate: /home/es/config/node1_http.crt <2>
 xpack.security.http.ssl.certificate_authorities: [ "/home/es/config/ca.crt" ] <3>
 --------------------------------------------------
 <1> The full path to the node key file. This must be a location within the
@@ -52,29 +68,29 @@ xpack.security.http.ssl.certificate_authorities: [ "/home/es/config/ca.crt" ] <3
     must be a location within the {es} configuration directory.
 --
 
-. If you secured the node's certificate with a password, add the password to
+.. If you secured the keystore or the private key with a password, add that password to a secure 
-your {es} keystore:
+setting in {es}.
-
-** If the signed certificate is in PKCS#12 format, use the following commands:
 +
 --
+If the certificates are in PKCS#12 format:
+
 [source,shell]
 -----------------------------------------------------------
 bin/elasticsearch-keystore add xpack.security.http.ssl.keystore.secure_password
-
-bin/elasticsearch-keystore add xpack.security.http.ssl.truststore.secure_password
 -----------------------------------------------------------
---
 
-** If the certificate is in PEM format, use the following commands:
+If the certificates are in PEM format:
-+
+
---
 [source,shell]
 -----------------------------------------------------------
 bin/elasticsearch-keystore add xpack.security.http.ssl.secure_key_passphrase
 -----------------------------------------------------------
 --
 
+. Optional: If you want to use {kib}, follow the instructions in the readme
+provided by the `elasticsearch-certutil http` command or see
+{kibana-ref}/configuring-tls.html[Encrypting communications in {kib}].
+
 . Restart {es}.
 
 [NOTE]

x-pack/docs/en/security/securing-communications/tls-transport.asciidoc

@@ -19,8 +19,8 @@ certificate.
 -----------------------------------------------------------
 xpack.security.transport.ssl.enabled: true
 xpack.security.transport.ssl.verification_mode: certificate <1>
-xpack.security.transport.ssl.keystore.path: certs/elastic-certificates.p12 <2>
+xpack.security.transport.ssl.keystore.path: elastic-certificates.p12 <2>
-xpack.security.transport.ssl.truststore.path: certs/elastic-certificates.p12 <3>
+xpack.security.transport.ssl.truststore.path: elastic-certificates.p12 <3>
 -----------------------------------------------------------
 <1> If you used the `--dns` or `--ip` options with the `elasticsearch-certutil cert` command
 and you want to enable strict hostname checking, set the verification mode to
@@ -29,7 +29,7 @@ See <<ssl-tls-settings, `xpack.security.transport.ssl.verification_mode`>> for a
 
 <2> If you created a separate certificate for each node, then you might need to
 customize this path on each node. If the filename matches the node name, you can
-use the `certs/${node.name}.p12` format, for example.
+use the `${node.name}.p12` format, for example.
 <3> The `elasticsearch-certutil` outputs a PKCS#12 keystore which includes the
 CA certificate as a trusted certificate entry. This allows for the keystore to
 also be used as a truststore. In this case, the path value should match