Correctly handle PKCS#11 tokens for system keystore (elastic#33460)

* Correctly handle NONE keyword for system keystore

As defined in the PKCS#11 reference guide
https://docs.oracle.com/javase/8/docs/technotes/guides/security/p11guide.html
PKCS#11 tokens can be used as the JSSE keystore and truststore and
the way to indicate this is to set `javax.net.ssl.keyStore` and
`javax.net.ssl.trustStore` to `NONE` (case sensitive).

This commits ensures that we honor this convention and do not
attempt to load the keystore or truststore if the system property is
set to NONE.

* Handle password protected system truststore

When a PKCS#11 token is used as the system truststore, we need to
pass a password when loading it, even if only for reading
certificate entries. This commit ensures that if
`javax.net.ssl.trustStoreType` is set to `PKCS#11` (as it would
when a PKCS#11 token is in use) the password specified in
`javax.net.ssl.trustStorePassword` is passed when attempting to
load the truststore.

Relates elastic#33459

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ssl/DefaultJDKTrustConfig.java

@@ -16,6 +16,10 @@
 import java.io.IOException;
 import java.nio.file.Path;
 import java.security.GeneralSecurityException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateException;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -34,7 +38,7 @@ private DefaultJDKTrustConfig() {
     @Override
     X509ExtendedTrustManager createTrustManager(@Nullable Environment environment) {
         try {
-            return CertParsingUtils.trustManager(null, TrustManagerFactory.getDefaultAlgorithm());
+            return CertParsingUtils.trustManager(getSystemTrustStore(), TrustManagerFactory.getDefaultAlgorithm());
         } catch (Exception e) {
             throw new ElasticsearchException("failed to initialize a TrustManagerFactory", e);
         }
@@ -81,4 +85,20 @@ static TrustConfig merge(TrustConfig trustConfig) {
             return new CombiningTrustConfig(Arrays.asList(INSTANCE, trustConfig));
         }
     }
+
+    /**
+     * When a PKCS#11 token is used as the system default keystore/truststore, we need to pass the keystore
+     * password when loading, even for reading certificates only ( as opposed to i.e. JKS keystores where
+     * we only need to pass the password for reading Private Key entries ).
+     *
+     * @return the KeyStore used as truststore for PKCS#11 initialized with the password, null otherwise
+     */
+    private KeyStore getSystemTrustStore() throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException {
+        if (System.getProperty("javax.net.ssl.trustStoreType", "").equalsIgnoreCase("PKCS11")) {
+            KeyStore keyStore = KeyStore.getInstance("PKCS11");
+            keyStore.load(null, System.getProperty("javax.net.ssl.trustStorePassword", "").toCharArray());
+            return keyStore;
+        }
+        return null;
+    }
 }

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ssl/SSLConfiguration.java

@@ -192,7 +192,7 @@ private static KeyConfig createKeyConfig(Settings settings, SSLConfiguration glo
         if (global != null) {
             return global.keyConfig();
         }
-        if (System.getProperty("javax.net.ssl.keyStore") != null) {
+        if (System.getProperty("javax.net.ssl.keyStore") != null && System.getProperty("javax.net.ssl.keyStore").equals("NONE") == false) {
             // TODO: we should not support loading a keystore from sysprops...
             try (SecureString keystorePassword = new SecureString(System.getProperty("javax.net.ssl.keyStorePassword", ""))) {
                 return new StoreKeyConfig(System.getProperty("javax.net.ssl.keyStore"), KeyStore.getDefaultType(), keystorePassword,
@@ -233,7 +233,8 @@ private static TrustConfig createCertChainTrustConfig(Settings settings, KeyConf
             String trustStoreAlgorithm = SETTINGS_PARSER.truststoreAlgorithm.get(settings);
             String trustStoreType = getKeyStoreType(SETTINGS_PARSER.truststoreType, settings, trustStorePath);
             return new StoreTrustConfig(trustStorePath, trustStoreType, trustStorePassword, trustStoreAlgorithm);
-        } else if (global == null && System.getProperty("javax.net.ssl.trustStore") != null) {
+        } else if (global == null && System.getProperty("javax.net.ssl.trustStore") != null
+            && System.getProperty("javax.net.ssl.trustStore").equals("NONE") == false) {
             try (SecureString truststorePassword = new SecureString(System.getProperty("javax.net.ssl.trustStorePassword", ""))) {
                 return new StoreTrustConfig(System.getProperty("javax.net.ssl.trustStore"), KeyStore.getDefaultType(), truststorePassword,
                         System.getProperty("ssl.TrustManagerFactory.algorithm", TrustManagerFactory.getDefaultAlgorithm()));