HDFS-6703. NFS: Files can be deleted from a read-only mount. Contributed by Srikanth Upputuri

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612702 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/RpcProgramNfs3.java

@@ -1051,8 +1051,12 @@ public READDIR3Response mknod(XDR xdr, RpcInfo info) {
   
   @Override
   public REMOVE3Response remove(XDR xdr, RpcInfo info) {
+    return remove(xdr, getSecurityHandler(info), info.remoteAddress());
+  }
+ 
+  @VisibleForTesting
+  REMOVE3Response remove(XDR xdr, SecurityHandler securityHandler, SocketAddress remoteAddress) {
     REMOVE3Response response = new REMOVE3Response(Nfs3Status.NFS3_OK);
-    SecurityHandler securityHandler = getSecurityHandler(info);
     DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
     if (dfsClient == null) {
       response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
@@ -1083,17 +1087,19 @@ public REMOVE3Response remove(XDR xdr, RpcInfo info) {
         return new REMOVE3Response(Nfs3Status.NFS3ERR_STALE);
       }
 
+      WccData errWcc = new WccData(Nfs3Utils.getWccAttr(preOpDirAttr),
+          preOpDirAttr);
+      if (!checkAccessPrivilege(remoteAddress, AccessPrivilege.READ_WRITE)) {
+        return new REMOVE3Response(Nfs3Status.NFS3ERR_ACCES, errWcc);
+      }
+
       String fileIdPath = dirFileIdPath + "/" + fileName;
       HdfsFileStatus fstat = Nfs3Utils.getFileStatus(dfsClient, fileIdPath);
       if (fstat == null) {
-        WccData dirWcc = new WccData(Nfs3Utils.getWccAttr(preOpDirAttr),
+        return new REMOVE3Response(Nfs3Status.NFS3ERR_NOENT, errWcc);
-            preOpDirAttr);
-        return new REMOVE3Response(Nfs3Status.NFS3ERR_NOENT, dirWcc);
       }
       if (fstat.isDir()) {
-        WccData dirWcc = new WccData(Nfs3Utils.getWccAttr(preOpDirAttr),
+        return new REMOVE3Response(Nfs3Status.NFS3ERR_ISDIR, errWcc);
-            preOpDirAttr);
-        return new REMOVE3Response(Nfs3Status.NFS3ERR_ISDIR, dirWcc);
       }
 
       boolean result = dfsClient.delete(fileIdPath, false);

hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestClientAccessPrivilege.java

@@ -0,0 +1,120 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.nfs.nfs3;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;
+import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+import org.apache.hadoop.nfs.nfs3.FileHandle;
+import org.apache.hadoop.nfs.nfs3.Nfs3Status;
+import org.apache.hadoop.nfs.nfs3.response.REMOVE3Response;
+import org.apache.hadoop.oncrpc.XDR;
+import org.apache.hadoop.oncrpc.security.SecurityHandler;
+import org.apache.hadoop.security.authorize.DefaultImpersonationProvider;
+import org.apache.hadoop.security.authorize.ProxyUsers;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class TestClientAccessPrivilege {
+  static MiniDFSCluster cluster = null;
+  static NfsConfiguration config = new NfsConfiguration();
+  static DistributedFileSystem hdfs;
+  static NameNode nn;
+  static String testdir = "/tmp";
+  static SecurityHandler securityHandler;
+
+  @BeforeClass
+  public static void setup() throws Exception {
+
+    String currentUser = System.getProperty("user.name");
+    config.set(DefaultImpersonationProvider.getTestProvider()
+        .getProxySuperuserGroupConfKey(currentUser), "*");
+    config.set(DefaultImpersonationProvider.getTestProvider()
+        .getProxySuperuserIpConfKey(currentUser), "*");
+    ProxyUsers.refreshSuperUserGroupsConfiguration(config);
+    cluster = new MiniDFSCluster.Builder(config).numDataNodes(1).build();
+    cluster.waitActive();
+    hdfs = cluster.getFileSystem();
+    nn = cluster.getNameNode();
+
+    // Use ephemeral port in case tests are running in parallel
+    config.setInt("nfs3.mountd.port", 0);
+    config.setInt("nfs3.server.port", 0);
+
+    securityHandler = Mockito.mock(SecurityHandler.class);
+    Mockito.when(securityHandler.getUser()).thenReturn(
+        System.getProperty("user.name"));
+  }
+
+  @AfterClass
+  public static void shutdown() throws Exception {
+    if (cluster != null) {
+      cluster.shutdown();
+    }
+  }
+
+  @Before
+  public void createFiles() throws IllegalArgumentException, IOException {
+    hdfs.delete(new Path(testdir), true);
+    hdfs.mkdirs(new Path(testdir));
+    DFSTestUtil.createFile(hdfs, new Path(testdir + "/f1"), 0, (short) 1, 0);
+  }
+
+  @Test(timeout = 60000)
+  public void testClientAccessPrivilegeForRemove() throws Exception {
+    // Configure ro access for nfs1 service
+    config.set("dfs.nfs.exports.allowed.hosts", "* ro");
+
+    // Start nfs
+    Nfs3 nfs = new Nfs3(config);
+    nfs.startServiceInternal(false);
+
+    RpcProgramNfs3 nfsd = (RpcProgramNfs3) nfs.getRpcProgram();
+
+    // Create a remove request
+    HdfsFileStatus status = nn.getRpcServer().getFileInfo(testdir);
+    long dirId = status.getFileId();
+
+    XDR xdr_req = new XDR();
+    FileHandle handle = new FileHandle(dirId);
+    handle.serialize(xdr_req);
+    xdr_req.writeString("f1");
+
+    // Remove operation
+    REMOVE3Response response = nfsd.remove(xdr_req.asReadOnlyWrap(),
+        securityHandler, new InetSocketAddress("localhost", 1234));
+
+    // Assert on return code
+    assertEquals("Incorrect return code", Nfs3Status.NFS3ERR_ACCES,
+        response.getStatus());
+
+  }
+
+}

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -886,6 +886,9 @@ Release 2.5.0 - UNRELEASED
     HDFS-6378. NFS registration should timeout instead of hanging when
     portmap/rpcbind is not available (Abhiraj Butala via brandonli)
 
+    HDFS-6703. NFS: Files can be deleted from a read-only mount
+    (Srikanth Upputuri via brandonli)
+
   BREAKDOWN OF HDFS-2006 SUBTASKS AND RELATED JIRAS
 
     HDFS-6299. Protobuf for XAttr and client-side implementation. (Yi Liu via umamahesh)