CefBoud commented on a change in pull request #4709:
URL: https://github.com/apache/nifi/pull/4709#discussion_r559230043



##########
File path: 
nifi-commons/nifi-security-utils/src/main/java/org/apache/nifi/security/util/CertificateUtils.java
##########
@@ -469,6 +472,14 @@ public static X509Certificate 
generateSelfSignedX509Certificate(KeyPair keyPair,
             // (2) extendedKeyUsage extension
             certBuilder.addExtension(Extension.extendedKeyUsage, false, new 
ExtendedKeyUsage(new KeyPurposeId[]{KeyPurposeId.id_kp_clientAuth, 
KeyPurposeId.id_kp_serverAuth}));
 
+            // (3) subjectAlternativeName extension. Include CN as a SAN entry.
+            try {
+                final String cn = IETFUtils.valueToString(new 
X500Name(dn).getRDNs(BCStyle.CN)[0].getFirst().getValue());
+                certBuilder.addExtension(Extension.subjectAlternativeName, 
false, new GeneralNames(new GeneralName(GeneralName.dNSName, cn)));

Review comment:
       How about *.domain.tld ? or *.sub.domain.tld? 




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