HDFS-7067. ClassCastException while using a key created by keytool to create encryption zone. (Charles Lamb via Colin P. McCabe)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/JavaKeyStoreProvider.java

@@ -21,7 +21,6 @@
 import com.google.common.base.Preconditions;
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileStatus;
@@ -401,6 +400,10 @@ public Metadata getMetadata(String name) throws IOException {
         Metadata meta = ((KeyMetadata) keyStore.getKey(name, password)).metadata;
         cache.put(name, meta);
         return meta;
+      } catch (ClassCastException e) {
+        throw new IOException("Can't cast key for " + name + " in keystore " +
+            path + " to a KeyMetadata. Key may have been added using " +
+            " keytool or some other non-Hadoop method.", e);
       } catch (KeyStoreException e) {
         throw new IOException("Can't get metadata for " + name +
             " from keystore " + path, e);

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/key/TestKeyProviderFactory.java

@@ -42,6 +42,7 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
 
 public class TestKeyProviderFactory {
 
@@ -430,4 +431,51 @@ public void testGetProviderViaURI() throws Exception {
     Assert.assertNull(kp);
 
   }
+
+  @Test
+  public void testJksProviderWithKeytoolKeys() throws Exception {
+    final Configuration conf = new Configuration();
+    final String keystoreDirAbsolutePath =
+        conf.getResource("hdfs7067.keystore").getPath();
+    final String ourUrl = JavaKeyStoreProvider.SCHEME_NAME + "://file@/" +
+        keystoreDirAbsolutePath;
+
+    conf.set(KeyProviderFactory.KEY_PROVIDER_PATH, ourUrl);
+
+    final KeyProvider provider = KeyProviderFactory.getProviders(conf).get(0);
+
+    // Sanity check that we are using the right keystore
+    @SuppressWarnings("unused")
+    final KeyProvider.KeyVersion keyVersion =
+            provider.getKeyVersion("testkey5@0");
+    try {
+      @SuppressWarnings("unused")
+      final KeyProvider.KeyVersion keyVersionWrongKeyNameFormat =
+          provider.getKeyVersion("testkey2");
+      fail("should have thrown an exception");
+    } catch (IOException e) {
+      // No version in key path testkey2/
+      GenericTestUtils.assertExceptionContains("No version in key path", e);
+    }
+    try {
+      @SuppressWarnings("unused")
+      final KeyProvider.KeyVersion keyVersionCurrentKeyNotWrongKeyNameFormat =
+          provider.getCurrentKey("testkey5@0");
+      fail("should have thrown an exception getting testkey5@0");
+    } catch (IOException e) {
+      // javax.crypto.spec.SecretKeySpec cannot be cast to
+      // org.apache.hadoop.crypto.key.JavaKeyStoreProvider$KeyMetadata
+      GenericTestUtils.assertExceptionContains("other non-Hadoop method", e);
+    }
+    try {
+      @SuppressWarnings("unused")
+      KeyProvider.KeyVersion keyVersionCurrentKeyNotReally =
+          provider.getCurrentKey("testkey2");
+      fail("should have thrown an exception getting testkey2");
+    } catch (IOException e) {
+      // javax.crypto.spec.SecretKeySpec cannot be cast to
+      // org.apache.hadoop.crypto.key.JavaKeyStoreProvider$KeyMetadata
+      GenericTestUtils.assertExceptionContains("other non-Hadoop method", e);
+    }
+  }
 }