anmolnar commented on a change in pull request #1353:
URL: https://github.com/apache/zookeeper/pull/1353#discussion_r427121077



##########
File path: 
zookeeper-server/src/main/java/org/apache/zookeeper/common/ZKHostnameVerifier.java
##########
@@ -324,8 +324,14 @@ private static HostNameType determineHostFormat(final 
String host) {
             for (List<?> entry : entries) {
                 final Integer type = entry.size() >= 2 ? (Integer) 
entry.get(0) : null;
                 if (type != null) {
-                    final String s = (String) entry.get(1);
-                    result.add(new SubjectName(s, type));
+                    if (type == SubjectName.DNS || type == SubjectName.IP) {
+                        final Object o = entry.get(1);
+                        if (o instanceof String) {
+                            result.add(new SubjectName((String) o, type));
+                        } else if (o instanceof byte[]) {
+                            // TODO ASN.1 DER encoded form

Review comment:
       I believe it can be done with BouncyCastle ASN1 libraries, but this part 
was missing in the original patch too. I'd be happy to add it as a separate 
ticket, but first I need an example certificate with ASN1 encoded data.




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