HADOOP-17793. Better token validation (#3189)

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit ba325a8ada)

 Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/security/token/block/BlockTokenSecretManager.java

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java

@@ -34,7 +34,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.*;
-import java.util.Arrays;
+import java.security.MessageDigest;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.ServiceConfigurationError;
@@ -419,8 +419,8 @@ public class Token<T extends TokenIdentifier> implements Writable {
       return false;
     } else {
       Token<T> r = (Token<T>) right;
-      return Arrays.equals(identifier, r.identifier) &&
-             Arrays.equals(password, r.password) &&
+      return MessageDigest.isEqual(identifier, r.identifier) &&
+             MessageDigest.isEqual(password, r.password) &&
              kind.equals(r.kind) &&
              service.equals(r.service);
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/security/token/block/BlockTokenSecretManager.java

@@ -22,6 +22,7 @@ import com.google.common.base.Charsets;
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
+import java.security.MessageDigest;
 import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.EnumSet;
@@ -407,7 +408,7 @@ public class BlockTokenSecretManager extends
               + ", block=" + block + ", access mode=" + mode);
     }
     checkAccess(id, userId, block, mode, storageTypes, storageIds);
-    if (!Arrays.equals(retrievePassword(id), token.getPassword())) {
+    if (!MessageDigest.isEqual(retrievePassword(id), token.getPassword())) {
       throw new InvalidToken("Block token with " + id
           + " doesn't have the correct token password");
     }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java

@@ -171,8 +171,8 @@ import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.URISyntaxException;
 import java.nio.ByteBuffer;
+import java.security.MessageDigest;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -1233,7 +1233,7 @@ public class ContainerManagerImpl extends CompositeService implements
             containerTokenIdentifier);
     byte[] tokenPass = token.getPassword().array();
     if (password == null || tokenPass == null
-        || !Arrays.equals(password, tokenPass)) {
+        || !MessageDigest.isEqual(password, tokenPass)) {
       throw new InvalidToken(
         "Invalid container token used for starting container on : "
             + context.getNodeId().toString());