kezhuw commented on code in PR #2176:
URL: https://github.com/apache/zookeeper/pull/2176#discussion_r1706693861
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zookeeper-server/src/main/java/org/apache/zookeeper/server/auth/SaslServerCallbackHandler.java:
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@@ -90,6 +90,11 @@ private void handleNameCallback(NameCallback nc) {
// check to see if this user is in the user password database.
if (credentials.get(nc.getDefaultName()) == null) {
LOG.warn("User '{}' not found in list of DIGEST-MD5
authenticateable users.", nc.getDefaultName());
+ // ZOOKEEPER-4839
+ // Incorrect usernames also need to be stored
+ // in order to clear the usernames of previously
+ // successfully logged-in users.
+ userName = nc.getDefaultName();
Review Comment:
Sounds viable to me.
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