[improve][pip] PIP-351: Additional options for Pulsar-Test client to support KeyStore based TLS

pip/pip-351.md

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+
+# PIP-351: Additional options for Pulsar-Test client to support KeyStore based TLS
+
+# Background knowledge
+
+<!--
+Describes all the knowledge you need to know in order to understand all the other sections in this PIP
+
+* Give a high level explanation on all concepts you will be using throughout this document. For example, if you want to talk about Persistent Subscriptions, explain briefly (1 paragraph) what this is. If you're going to talk about Transaction Buffer, explain briefly what this is. 
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+EXAMPLES
+* See [PIP-248](https://github.com/apache/pulsar/issues/19601), Background section to get an understanding on how you add the background knowledge needed.
+  (They also included the motivation there, but ignore it as we place that in Motivation section explicitly).
+-->
+
+In both Pulsar Client and Pulsar Admin, we support the use of KeyStores. This feature is provided by means of the boolean
+"useKeyStoreTls". The boolean is also the only way authentication mechanisms such as AuthenticationKeyStoreTls can be utilised
+properly, as the logic to use keystores for SSL Connections, from either ClientConfigurationData stored in Pulsar Admin/Client
+or AuthData hinges on the "useKeyStoreTls" boolean as can be seen below:
+
+<b>AsyncHttpConnector.java</b>
+```java
+if (conf.isUseKeyStoreTls()) {
+    KeyStoreParams params = authData.hasDataForTls() ? authData.getTlsKeyStoreParams() :
+            new KeyStoreParams(conf.getTlsKeyStoreType(), conf.getTlsKeyStorePath(),
+                    conf.getTlsKeyStorePassword());
+
+    final SSLContext sslCtx = KeyStoreSSLContext.createClientSslContext(
+            conf.getSslProvider(),
+            params.getKeyStoreType(),
+            params.getKeyStorePath(),
+            params.getKeyStorePassword(),
+            conf.isTlsAllowInsecureConnection(),
+            conf.getTlsTrustStoreType(),
+            conf.getTlsTrustStorePath(),
+            conf.getTlsTrustStorePassword(),
+            conf.getTlsCiphers(),
+            conf.getTlsProtocols());
+
+    JsseSslEngineFactory sslEngineFactory = new JsseSslEngineFactory(sslCtx);
+    confBuilder.setSslEngineFactory(sslEngineFactory);
+}
+```
+
+None of these options can be currently configured when using Pulsar Test client.
+
+# Motivation
+
+<!--
+Describe the problem this proposal is trying to solve.
+
+* Explain what is the problem you're trying to solve - current situation.
+* This section is the "Why" of your proposal.
+-->
+
+As we already let users both extend authentication and use just the keystore and truststore properties to set up mTLS
+connections, without using any authentication plugin class, a lot of them might want to use this method of authentication
+during Performance Testing as well.
+
+I understand that currently mTLS (for testing purposes) can be achieved by using trust and client certificates.
+However, the issue of users extending authentication plugin classes and utilizing keystores is still not covered 
+with the current options. Therefore, I propose we make these already existing options be configured in test clients,
+increasing its usability.
+
+# Goals
+
+## In Scope
+
+Create new Arguments for the following properties, in PerformanceBaseArguments.java :
+1. useKeyStoreTls
+2. trustStoreType
+3. trustStorePath
+4. trustStorePass
+5. keyStoreType
+6. keyStorePath
+7. keyStorePass
+
+Update the code to change between TrustCerts and TrustStore based on useKeyStoreTls.
+
+<!--
+What this PIP intend to achieve once It's integrated into Pulsar.
+Why does it benefit Pulsar.
+-->
+
+[//]: # (## Out of Scope)
+
+<!--
+Describe what you have decided to keep out of scope, perhaps left for a different PIP/s.
+-->
+
+
+[//]: # (# High Level Design)
+
+<!--
+Describe the design of your solution in *high level*.
+Describe the solution end to end, from a birds-eye view.
+Don't go into implementation details in this section.
+
+I should be able to finish reading from beginning of the PIP to here (including) and understand the feature and 
+how you intend to solve it, end to end.
+
+DON'T
+* Avoid code snippets, unless it's essential to explain your intent.
+-->
+
+# Detailed Design
+
+## Design & Implementation Details
+
+<!--
+This is the section where you dive into the details. It can be:
+* Concrete class names and their roles and responsibility, including methods.
+* Code snippets of existing code.
+* Interface names and its methods.
+* ...
+-->
+
+Add the options for utilizing keystores as part of performance base arguments, along with forwarding their values
+to the client/admin builders.
+
+## Public-facing Changes
+
+<!--
+Describe the additions you plan to make for each public facing component. 
+Remove the sections you are not changing.
+Clearly mark any changes which are BREAKING backward compatability.
+-->
+
+### CLI
+
+All places we utilize Pulsar Test client, for example Pulsar-Perf will have the following new options:
+
+1. --use-keystore-tls &rarr; Default value = false
+2. --truststore-type &rarr; Default value = JKS, Possible values = JKS, PKCS12
+3. --truststore-path &rarr; Default value = ""
+4. --truststore-pass &rarr; Default value = ""
+5. --keystore-type &rarr; Default value = JKS, Possible values = JKS, PKCS12
+6. --keystore-path &rarr; Default value = ""
+7. --keystore-pass &rarr; Default value = ""
+
+
+
+# Backward & Forward Compatibility
+
+The change will not affect any previous releases. The options can also be brought to previous versions, however, I have
+noticed that Pulsar has moved away from JCommander in Version 3.2.x to Picocli (currently in master)
+Therefore, to add these options to previous versions, the code has to be replicated to those versions.