[flink] branch master updated: [FLINK-29622][runtime][security] Start kerberos delegation token provider only if the user provided valid credentials

[mbalassi]

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mbalassi pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/flink.git


The following commit(s) were added to refs/heads/master by this push:
     new fee5b2d8c6c [FLINK-29622][runtime][security] Start kerberos delegation 
token provider only if the user provided valid credentials
fee5b2d8c6c is described below

commit fee5b2d8c6cdfa4912febe09024dc51d57b18143
Author: Gabor Somogyi <gabor_somog...@apple.com>
AuthorDate: Wed Oct 19 15:08:33 2022 +0200

    [FLINK-29622][runtime][security] Start kerberos delegation token provider 
only if the user provided valid credentials
---
 .../token/KerberosDelegationTokenManagerFactory.java     | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git 
a/flink-runtime/src/main/java/org/apache/flink/runtime/security/token/KerberosDelegationTokenManagerFactory.java
 
b/flink-runtime/src/main/java/org/apache/flink/runtime/security/token/KerberosDelegationTokenManagerFactory.java
index 60494b105d7..f9cd4fffb07 100644
--- 
a/flink-runtime/src/main/java/org/apache/flink/runtime/security/token/KerberosDelegationTokenManagerFactory.java
+++ 
b/flink-runtime/src/main/java/org/apache/flink/runtime/security/token/KerberosDelegationTokenManagerFactory.java
@@ -28,6 +28,7 @@ import org.slf4j.LoggerFactory;
 
 import javax.annotation.Nullable;
 
+import java.io.IOException;
 import java.util.concurrent.ExecutorService;
 
 /** A factory for {@link KerberosDelegationTokenManager}. */
@@ -40,12 +41,21 @@ public class KerberosDelegationTokenManagerFactory {
             ClassLoader classLoader,
             Configuration configuration,
             @Nullable ScheduledExecutor scheduledExecutor,
-            @Nullable ExecutorService ioExecutor) {
+            @Nullable ExecutorService ioExecutor)
+            throws IOException {
 
         if 
(configuration.getBoolean(SecurityOptions.KERBEROS_FETCH_DELEGATION_TOKEN)) {
             if (HadoopDependency.isHadoopCommonOnClasspath(classLoader)) {
-                return new KerberosDelegationTokenManager(
-                        configuration, scheduledExecutor, ioExecutor);
+                KerberosLoginProvider kerberosLoginProvider =
+                        new KerberosLoginProvider(configuration);
+                if (kerberosLoginProvider.isLoginPossible()) {
+                    return new KerberosDelegationTokenManager(
+                            configuration, scheduledExecutor, ioExecutor);
+                } else {
+                    LOG.info(
+                            "Cannot use kerberos delegation token manager no 
valid kerberos credentials provided.");
+                    return new NoOpDelegationTokenManager();
+                }
             } else {
                 LOG.info(
                         "Cannot use kerberos delegation token manager because 
Hadoop cannot be found in the Classpath.");