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https://issues.apache.org/jira/browse/DIRKRB-762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jichao Wang updated DIRKRB-762:
-------------------------------
Attachment: kdc-npe.png
> The AS request appears with an NPE when preauth_required is set to false
> ------------------------------------------------------------------------
>
> Key: DIRKRB-762
> URL: https://issues.apache.org/jira/browse/DIRKRB-762
> Project: Directory Kerberos
> Issue Type: Bug
> Affects Versions: 2.0.0, 2.0.1, 2.0.2
> Reporter: Jichao Wang
> Priority: Major
> Fix For: 2.0.3
>
> Attachments: kdc-npe.png
>
>
> If change the value of preauth_required in the kdc.conf file to false, then
> using the following code to access the KDC causes an NPE error.
> {code:java}
> // Run on JDK8 or JDK11
> public class Test {
> public static void main(String[] args) throws Exception {
> LoginContext lc = new LoginContext("SampleClient",
> new Subject(),
> null,
> new CustomConfiguration("had...@hadoop.com",
> "/root/wjc/hadoop.keytab"));
> lc.login();
> System.out.println(lc.getSubject().toString());
> }
> } {code}
> Here is a fix to the problem:
> {code:java}
> Index:
> kerby-kerb/kerb-server/src/main/java/org/apache/kerby/kerberos/kerb/server/request/KdcRequest.java
> IDEA additional info:
> Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
> <+>UTF-8
> ===================================================================
> diff --git
> a/kerby-kerb/kerb-server/src/main/java/org/apache/kerby/kerberos/kerb/server/request/KdcRequest.java
>
> b/kerby-kerb/kerb-server/src/main/java/org/apache/kerby/kerberos/kerb/server/request/KdcRequest.java
> ---
> a/kerby-kerb/kerb-server/src/main/java/org/apache/kerby/kerberos/kerb/server/request/KdcRequest.java
> (revision 03784fcde8e94fedbe789606d2f328104c20b33f)
> +++
> b/kerby-kerb/kerb-server/src/main/java/org/apache/kerby/kerberos/kerb/server/request/KdcRequest.java
> (date 1670208307220)
> @@ -678,11 +678,13 @@
> }
>
> PaData preAuthData = request.getPaData();
> - if (isPreauthRequired() && (preAuthData == null ||
> preAuthData.isEmpty())) {
> - LOG.info("The preauth data is empty.");
> - KrbError krbError = makePreAuthenticationError(kdcContext,
> request,
> - KrbErrorCode.KDC_ERR_PREAUTH_REQUIRED, false);
> - throw new KdcRecoverableException(krbError);
> + if (isPreauthRequired()) {
> + if (preAuthData == null || preAuthData.isEmpty()) {
> + LOG.info("The preauth data is empty.");
> + KrbError krbError = makePreAuthenticationError(kdcContext,
> request,
> + KrbErrorCode.KDC_ERR_PREAUTH_REQUIRED, false);
> + throw new KdcRecoverableException(krbError);
> + }
> } else {
> getPreauthHandler().verify(this, preAuthData);
> }
> {code}
>
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