HADOOP-11934. Use of JavaKeyStoreProvider in LdapGroupsMapping causes infinite loop. Contributed by Larry McCay.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -832,6 +832,9 @@ Release 2.7.1 - UNRELEASED
     HADOOP-11973. Ensure ZkDelegationTokenSecretManager namespace znodes get
     created with ACLs. (Gregory Chanan via asuresh)
 
+    HADOOP-11934. Use of JavaKeyStoreProvider in LdapGroupsMapping causes
+    infinite loop. (Larry McCay via cnauroth)
+
 Release 2.7.0 - 2015-04-20
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/AbstractJavaKeyStoreProvider.java

@@ -0,0 +1,344 @@
+/**
+ * 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.security.alias;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.security.ProviderUtils;
+
+import com.google.common.base.Charsets;
+
+import javax.crypto.spec.SecretKeySpec;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URI;
+import java.net.URL;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.UnrecoverableKeyException;
+import java.security.cert.CertificateException;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+/**
+ * Abstract class for implementing credential providers that are based on
+ * Java Keystores as the underlying credential store.
+ *
+ * The password for the keystore is taken from the HADOOP_CREDSTORE_PASSWORD
+ * environment variable with a default of 'none'.
+ *
+ * It is expected that for access to credential protected resource to copy the
+ * creds from the original provider into the job's Credentials object, which is
+ * accessed via the UserProvider. Therefore, these providers won't be directly
+ * used by MapReduce tasks.
+ */
+@InterfaceAudience.Private
+public abstract class AbstractJavaKeyStoreProvider extends CredentialProvider {
+  public static final String CREDENTIAL_PASSWORD_NAME =
+      "HADOOP_CREDSTORE_PASSWORD";
+  public static final String KEYSTORE_PASSWORD_FILE_KEY =
+      "hadoop.security.credstore.java-keystore-provider.password-file";
+  public static final String KEYSTORE_PASSWORD_DEFAULT = "none";
+
+  private Path path;
+  private final URI uri;
+  private final KeyStore keyStore;
+  private char[] password = null;
+  private boolean changed = false;
+  private Lock readLock;
+  private Lock writeLock;
+
+  protected AbstractJavaKeyStoreProvider(URI uri, Configuration conf)
+      throws IOException {
+    this.uri = uri;
+    initFileSystem(uri, conf);
+    // Get the password from the user's environment
+    if (System.getenv().containsKey(CREDENTIAL_PASSWORD_NAME)) {
+      password = System.getenv(CREDENTIAL_PASSWORD_NAME).toCharArray();
+    }
+    // if not in ENV get check for file
+    if (password == null) {
+      String pwFile = conf.get(KEYSTORE_PASSWORD_FILE_KEY);
+      if (pwFile != null) {
+        ClassLoader cl = Thread.currentThread().getContextClassLoader();
+        URL pwdFile = cl.getResource(pwFile);
+        if (pwdFile != null) {
+          try (InputStream is = pwdFile.openStream()) {
+            password = IOUtils.toString(is).trim().toCharArray();
+          }
+        }
+      }
+    }
+    if (password == null) {
+      password = KEYSTORE_PASSWORD_DEFAULT.toCharArray();
+    }
+    try {
+      keyStore = KeyStore.getInstance("jceks");
+      if (keystoreExists()) {
+        stashOriginalFilePermissions();
+        try (InputStream in = getInputStreamForFile()) {
+          keyStore.load(in, password);
+        }
+      } else {
+        createPermissions("700");
+        // required to create an empty keystore. *sigh*
+        keyStore.load(null, password);
+      }
+    } catch (KeyStoreException e) {
+      throw new IOException("Can't create keystore", e);
+    } catch (NoSuchAlgorithmException e) {
+      throw new IOException("Can't load keystore " + getPathAsString(), e);
+    } catch (CertificateException e) {
+      throw new IOException("Can't load keystore " + getPathAsString(), e);
+    }
+    ReadWriteLock lock = new ReentrantReadWriteLock(true);
+    readLock = lock.readLock();
+    writeLock = lock.writeLock();
+  }
+
+  public Path getPath() {
+    return path;
+  }
+
+  public void setPath(Path p) {
+    this.path = p;
+  }
+
+  public char[] getPassword() {
+    return password;
+  }
+
+  public void setPassword(char[] pass) {
+    this.password = pass;
+  }
+
+  public boolean isChanged() {
+    return changed;
+  }
+
+  public void setChanged(boolean chg) {
+    this.changed = chg;
+  }
+
+  public Lock getReadLock() {
+    return readLock;
+  }
+
+  public void setReadLock(Lock rl) {
+    this.readLock = rl;
+  }
+
+  public Lock getWriteLock() {
+    return writeLock;
+  }
+
+  public void setWriteLock(Lock wl) {
+    this.writeLock = wl;
+  }
+
+  public URI getUri() {
+    return uri;
+  }
+
+  public KeyStore getKeyStore() {
+    return keyStore;
+  }
+
+  public Map<String, CredentialEntry> getCache() {
+    return cache;
+  }
+
+  private final Map<String, CredentialEntry> cache =
+      new HashMap<String, CredentialEntry>();
+
+  protected final String getPathAsString() {
+    return getPath().toString();
+  }
+
+  protected abstract String getSchemeName();
+
+  protected abstract OutputStream getOutputStreamForKeystore()
+      throws IOException;
+
+  protected abstract boolean keystoreExists() throws IOException;
+
+  protected abstract InputStream getInputStreamForFile() throws IOException;
+
+  protected abstract void createPermissions(String perms) throws IOException;
+
+  protected abstract void stashOriginalFilePermissions() throws IOException;
+
+  protected void initFileSystem(URI keystoreUri, Configuration conf)
+      throws IOException {
+    path = ProviderUtils.unnestUri(keystoreUri);
+  }
+
+  @Override
+  public CredentialEntry getCredentialEntry(String alias)
+      throws IOException {
+    readLock.lock();
+    try {
+      SecretKeySpec key = null;
+      try {
+        if (cache.containsKey(alias)) {
+          return cache.get(alias);
+        }
+        if (!keyStore.containsAlias(alias)) {
+          return null;
+        }
+        key = (SecretKeySpec) keyStore.getKey(alias, password);
+      } catch (KeyStoreException e) {
+        throw new IOException("Can't get credential " + alias + " from "
+            + getPathAsString(), e);
+      } catch (NoSuchAlgorithmException e) {
+        throw new IOException("Can't get algorithm for credential " + alias
+            + " from " + getPathAsString(), e);
+      } catch (UnrecoverableKeyException e) {
+        throw new IOException("Can't recover credential " + alias + " from "
+            + getPathAsString(), e);
+      }
+      return new CredentialEntry(alias, bytesToChars(key.getEncoded()));
+    } finally {
+      readLock.unlock();
+    }
+  }
+
+  public static char[] bytesToChars(byte[] bytes) throws IOException {
+    String pass;
+    pass = new String(bytes, Charsets.UTF_8);
+    return pass.toCharArray();
+  }
+
+  @Override
+  public List<String> getAliases() throws IOException {
+    readLock.lock();
+    try {
+      ArrayList<String> list = new ArrayList<String>();
+      String alias = null;
+      try {
+        Enumeration<String> e = keyStore.aliases();
+        while (e.hasMoreElements()) {
+          alias = e.nextElement();
+          list.add(alias);
+        }
+      } catch (KeyStoreException e) {
+        throw new IOException("Can't get alias " + alias + " from "
+            + getPathAsString(), e);
+      }
+      return list;
+    } finally {
+      readLock.unlock();
+    }
+  }
+
+  @Override
+  public CredentialEntry createCredentialEntry(String alias, char[] credential)
+      throws IOException {
+    writeLock.lock();
+    try {
+      if (keyStore.containsAlias(alias) || cache.containsKey(alias)) {
+        throw new IOException("Credential " + alias + " already exists in "
+            + this);
+      }
+      return innerSetCredential(alias, credential);
+    } catch (KeyStoreException e) {
+      throw new IOException("Problem looking up credential " + alias + " in "
+          + this, e);
+    } finally {
+      writeLock.unlock();
+    }
+  }
+
+  @Override
+  public void deleteCredentialEntry(String name) throws IOException {
+    writeLock.lock();
+    try {
+      try {
+        if (keyStore.containsAlias(name)) {
+          keyStore.deleteEntry(name);
+        } else {
+          throw new IOException("Credential " + name + " does not exist in "
+              + this);
+        }
+      } catch (KeyStoreException e) {
+        throw new IOException("Problem removing " + name + " from " + this, e);
+      }
+      cache.remove(name);
+      changed = true;
+    } finally {
+      writeLock.unlock();
+    }
+  }
+
+  CredentialEntry innerSetCredential(String alias, char[] material)
+      throws IOException {
+    writeLock.lock();
+    try {
+      keyStore.setKeyEntry(alias,
+          new SecretKeySpec(new String(material).getBytes("UTF-8"), "AES"),
+          password, null);
+    } catch (KeyStoreException e) {
+      throw new IOException("Can't store credential " + alias + " in " + this,
+          e);
+    } finally {
+      writeLock.unlock();
+    }
+    changed = true;
+    return new CredentialEntry(alias, material);
+  }
+
+  @Override
+  public void flush() throws IOException {
+    writeLock.lock();
+    try {
+      if (!changed) {
+        return;
+      }
+      // write out the keystore
+      try (OutputStream out = getOutputStreamForKeystore()) {
+        keyStore.store(out, password);
+      } catch (KeyStoreException e) {
+        throw new IOException("Can't store keystore " + this, e);
+      } catch (NoSuchAlgorithmException e) {
+        throw new IOException("No such algorithm storing keystore " + this, e);
+      } catch (CertificateException e) {
+        throw new IOException("Certificate exception storing keystore " + this,
+            e);
+      }
+      changed = false;
+    } finally {
+      writeLock.unlock();
+    }
+  }
+
+  @Override
+  public String toString() {
+    return uri.toString();
+  }
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/JavaKeyStoreProvider.java

@@ -18,266 +18,75 @@
 
 package org.apache.hadoop.security.alias;
 
-import org.apache.commons.io.Charsets;
-import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.security.ProviderUtils;
 
-import javax.crypto.spec.SecretKeySpec;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.URI;
-import java.net.URL;
-import java.security.KeyStore;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.UnrecoverableKeyException;
-import java.security.cert.CertificateException;
-import java.util.ArrayList;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 /**
- * CredentialProvider based on Java's KeyStore file format. The file may be 
+ * CredentialProvider based on Java's KeyStore file format. The file may be
  * stored in any Hadoop FileSystem using the following name mangling:
- *  jceks://hdfs@nn1.example.com/my/creds.jceks -> hdfs://nn1.example.com/my/creds.jceks
- *  jceks://file/home/larry/creds.jceks -> file:///home/larry/creds.jceks
- *
- * The password for the keystore is taken from the HADOOP_CREDSTORE_PASSWORD
- * environment variable with a default of 'none'.
- *
- * It is expected that for access to credential protected resource to copy the 
- * creds from the original provider into the job's Credentials object, which is
- * accessed via the UserProvider. Therefore, this provider won't be directly 
- * used by MapReduce tasks.
+ * jceks://hdfs@nn1.example.com/my/creds.jceks ->
+ * hdfs://nn1.example.com/my/creds.jceks jceks://file/home/larry/creds.jceks ->
+ * file:///home/larry/creds.jceks
  */
 @InterfaceAudience.Private
-public class JavaKeyStoreProvider extends CredentialProvider {
+public class JavaKeyStoreProvider extends AbstractJavaKeyStoreProvider {
   public static final String SCHEME_NAME = "jceks";
-  public static final String CREDENTIAL_PASSWORD_NAME =
-      "HADOOP_CREDSTORE_PASSWORD";
-  public static final String KEYSTORE_PASSWORD_FILE_KEY =
-      "hadoop.security.credstore.java-keystore-provider.password-file";
-  public static final String KEYSTORE_PASSWORD_DEFAULT = "none";
-
-  private final URI uri;
-  private final Path path;
-  private final FileSystem fs;
-  private final FsPermission permissions;
-  private final KeyStore keyStore;
-  private char[] password = null;
-  private boolean changed = false;
-  private Lock readLock;
-  private Lock writeLock;
-
-  private final Map<String, CredentialEntry> cache = new HashMap<String, CredentialEntry>();
-
-  private JavaKeyStoreProvider(URI uri, Configuration conf) throws IOException {
-    this.uri = uri;
-    path = ProviderUtils.unnestUri(uri);
-    fs = path.getFileSystem(conf);
-    // Get the password from the user's environment
-    if (System.getenv().containsKey(CREDENTIAL_PASSWORD_NAME)) {
-      password = System.getenv(CREDENTIAL_PASSWORD_NAME).toCharArray();
-    }
-    // if not in ENV get check for file
-    if (password == null) {
-      String pwFile = conf.get(KEYSTORE_PASSWORD_FILE_KEY);
-      if (pwFile != null) {
-        ClassLoader cl = Thread.currentThread().getContextClassLoader();
-        URL pwdFile = cl.getResource(pwFile);
-        if (pwdFile != null) {
-          try (InputStream is = pwdFile.openStream()) {
-            password = IOUtils.toString(is).trim().toCharArray();
-          }
-        }
-      }
-    }
-    if (password == null) {
-      password = KEYSTORE_PASSWORD_DEFAULT.toCharArray();
-    }
 
-    try {
-      keyStore = KeyStore.getInstance(SCHEME_NAME);
-      if (fs.exists(path)) {
-        // save off permissions in case we need to
-        // rewrite the keystore in flush()
-        FileStatus s = fs.getFileStatus(path);
-        permissions = s.getPermission();
+  private FileSystem fs;
+  private FsPermission permissions;
 
-        try (FSDataInputStream in = fs.open(path)) {
-          keyStore.load(in, password);
-        }
-      } else {
-        permissions = new FsPermission("700");
-        // required to create an empty keystore. *sigh*
-        keyStore.load(null, password);
-      }
-    } catch (KeyStoreException e) {
-      throw new IOException("Can't create keystore", e);
-    } catch (NoSuchAlgorithmException e) {
-      throw new IOException("Can't load keystore " + path, e);
-    } catch (CertificateException e) {
-      throw new IOException("Can't load keystore " + path, e);
-    }
-    ReadWriteLock lock = new ReentrantReadWriteLock(true);
-    readLock = lock.readLock();
-    writeLock = lock.writeLock();
+  private JavaKeyStoreProvider(URI uri, Configuration conf)
+      throws IOException {
+    super(uri, conf);
   }
 
   @Override
-  public CredentialEntry getCredentialEntry(String alias) throws IOException {
-    readLock.lock();
-    try {
-      SecretKeySpec key = null;
-      try {
-        if (cache.containsKey(alias)) {
-          return cache.get(alias);
-        }
-        if (!keyStore.containsAlias(alias)) {
-          return null;
-        }
-        key = (SecretKeySpec) keyStore.getKey(alias, password);
-      } catch (KeyStoreException e) {
-        throw new IOException("Can't get credential " + alias + " from " +
-                              path, e);
-      } catch (NoSuchAlgorithmException e) {
-        throw new IOException("Can't get algorithm for credential " + alias + " from " +
-                              path, e);
-      } catch (UnrecoverableKeyException e) {
-        throw new IOException("Can't recover credential " + alias + " from " + path, e);
-      }
-      return new CredentialEntry(alias, bytesToChars(key.getEncoded()));
-    } 
-    finally {
-      readLock.unlock();
-    }
-  }
-  
-  public static char[] bytesToChars(byte[] bytes) {
-    String pass = new String(bytes, Charsets.UTF_8);
-    return pass.toCharArray();
+  protected String getSchemeName() {
+    return SCHEME_NAME;
   }
 
   @Override
-  public List<String> getAliases() throws IOException {
-    readLock.lock();
-    try {
-      ArrayList<String> list = new ArrayList<String>();
-      String alias = null;
-      try {
-        Enumeration<String> e = keyStore.aliases();
-        while (e.hasMoreElements()) {
-           alias = e.nextElement();
-           list.add(alias);
-        }
-      } catch (KeyStoreException e) {
-        throw new IOException("Can't get alias " + alias + " from " + path, e);
-      }
-      return list;
-    }
-    finally {
-      readLock.unlock();
-    }
+  protected OutputStream getOutputStreamForKeystore() throws IOException {
+    FSDataOutputStream out = FileSystem.create(fs, getPath(), permissions);
+    return out;
   }
 
   @Override
-  public CredentialEntry createCredentialEntry(String alias, char[] credential)
-      throws IOException {
-    writeLock.lock();
-    try {
-      if (keyStore.containsAlias(alias) || cache.containsKey(alias)) {
-        throw new IOException("Credential " + alias + " already exists in " + this);
-      }
-      return innerSetCredential(alias, credential);
-    } catch (KeyStoreException e) {
-      throw new IOException("Problem looking up credential " + alias + " in " + this,
-          e);
-    } finally {
-      writeLock.unlock();
-    }
+  protected boolean keystoreExists() throws IOException {
+    return fs.exists(getPath());
   }
 
   @Override
-  public void deleteCredentialEntry(String name) throws IOException {
-    writeLock.lock();
-    try {
-      try {
-        if (keyStore.containsAlias(name)) {
-          keyStore.deleteEntry(name);
-        }
-        else {
-          throw new IOException("Credential " + name + " does not exist in " + this);
-        }
-      } catch (KeyStoreException e) {
-        throw new IOException("Problem removing " + name + " from " +
-            this, e);
-      }
-      cache.remove(name);
-      changed = true;
-    }
-    finally {
-      writeLock.unlock();
-    }
+  protected InputStream getInputStreamForFile() throws IOException {
+    return fs.open(getPath());
   }
 
-  CredentialEntry innerSetCredential(String alias, char[] material)
-      throws IOException {
-    writeLock.lock();
-    try {
-      keyStore.setKeyEntry(alias, new SecretKeySpec(
-          new String(material).getBytes("UTF-8"), "AES"),
-          password, null);
-    } catch (KeyStoreException e) {
-      throw new IOException("Can't store credential " + alias + " in " + this,
-          e);
-    } finally {
-      writeLock.unlock();
-    }
-    changed = true;
-    return new CredentialEntry(alias, material);
+  @Override
+  protected void createPermissions(String perms) {
+    permissions = new FsPermission(perms);
   }
 
   @Override
-  public void flush() throws IOException {
-    writeLock.lock();
-    try {
-      if (!changed) {
-        return;
-      }
-      // write out the keystore
-      try (FSDataOutputStream out = FileSystem.create(fs, path, permissions)) {
-        keyStore.store(out, password);
-      } catch (KeyStoreException e) {
-        throw new IOException("Can't store keystore " + this, e);
-      } catch (NoSuchAlgorithmException e) {
-        throw new IOException("No such algorithm storing keystore " + this, e);
-      } catch (CertificateException e) {
-        throw new IOException("Certificate exception storing keystore " + this,
-            e);
-      }
-      changed = false;
-    }
-    finally {
-      writeLock.unlock();
-    }
+  protected void stashOriginalFilePermissions() throws IOException {
+    // save off permissions in case we need to
+    // rewrite the keystore in flush()
+    FileStatus s = fs.getFileStatus(getPath());
+    permissions = s.getPermission();
   }
 
-  @Override
-  public String toString() {
-    return uri.toString();
+  protected void initFileSystem(URI uri, Configuration conf)
+      throws IOException {
+    super.initFileSystem(uri, conf);
+    fs = getPath().getFileSystem(conf);
   }
 
   /**
@@ -286,7 +95,7 @@ public class JavaKeyStoreProvider extends CredentialProvider {
   public static class Factory extends CredentialProviderFactory {
     @Override
     public CredentialProvider createProvider(URI providerName,
-                                      Configuration conf) throws IOException {
+        Configuration conf) throws IOException {
       if (SCHEME_NAME.equals(providerName.getScheme())) {
         return new JavaKeyStoreProvider(providerName, conf);
       }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/LocalJavaKeyStoreProvider.java

@@ -0,0 +1,192 @@
+/**
+ * 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.security.alias;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.util.Shell;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.Set;
+import java.util.StringTokenizer;
+import java.util.EnumSet;
+
+/**
+ * CredentialProvider based on Java's KeyStore file format. The file may be
+ * stored only on the local filesystem using the following name mangling:
+ * localjceks://file/home/larry/creds.jceks -> file:///home/larry/creds.jceks
+ */
+@InterfaceAudience.Private
+public final class LocalJavaKeyStoreProvider extends
+    AbstractJavaKeyStoreProvider {
+  public static final String SCHEME_NAME = "localjceks";
+  private File file;
+  private Set<PosixFilePermission> permissions;
+
+  private LocalJavaKeyStoreProvider(URI uri, Configuration conf)
+      throws IOException {
+    super(uri, conf);
+  }
+
+  @Override
+  protected String getSchemeName() {
+    return SCHEME_NAME;
+  }
+
+  @Override
+  protected OutputStream getOutputStreamForKeystore() throws IOException {
+    FileOutputStream out = new FileOutputStream(file);
+    return out;
+  }
+
+  @Override
+  protected boolean keystoreExists() throws IOException {
+    return file.exists();
+  }
+
+  @Override
+  protected InputStream getInputStreamForFile() throws IOException {
+    FileInputStream is = new FileInputStream(file);
+    return is;
+  }
+
+  @Override
+  protected void createPermissions(String perms) throws IOException {
+    int mode = 700;
+    try {
+      mode = Integer.parseInt(perms, 8);
+    } catch (NumberFormatException nfe) {
+      throw new IOException("Invalid permissions mode provided while "
+          + "trying to createPermissions", nfe);
+    }
+    permissions = modeToPosixFilePermission(mode);
+  }
+
+  @Override
+  protected void stashOriginalFilePermissions() throws IOException {
+    // save off permissions in case we need to
+    // rewrite the keystore in flush()
+    if (!Shell.WINDOWS) {
+      Path path = Paths.get(file.getCanonicalPath());
+      permissions = Files.getPosixFilePermissions(path);
+    } else {
+      // On Windows, the JDK does not support the POSIX file permission APIs.
+      // Instead, we can do a winutils call and translate.
+      String[] cmd = Shell.getGetPermissionCommand();
+      String[] args = new String[cmd.length + 1];
+      System.arraycopy(cmd, 0, args, 0, cmd.length);
+      args[cmd.length] = file.getCanonicalPath();
+      String out = Shell.execCommand(args);
+      StringTokenizer t = new StringTokenizer(out, Shell.TOKEN_SEPARATOR_REGEX);
+      // The winutils output consists of 10 characters because of the leading
+      // directory indicator, i.e. "drwx------".  The JDK parsing method expects
+      // a 9-character string, so remove the leading character.
+      String permString = t.nextToken().substring(1);
+      permissions = PosixFilePermissions.fromString(permString);
+    }
+  }
+
+  @Override
+  protected void initFileSystem(URI uri, Configuration conf)
+      throws IOException {
+    super.initFileSystem(uri, conf);
+    try {
+      file = new File(new URI(getPath().toString()));
+    } catch (URISyntaxException e) {
+      throw new IOException(e);
+    }
+  }
+
+  @Override
+  public void flush() throws IOException {
+    super.flush();
+    if (!Shell.WINDOWS) {
+      Files.setPosixFilePermissions(Paths.get(file.getCanonicalPath()),
+          permissions);
+    } else {
+      // FsPermission expects a 10-character string because of the leading
+      // directory indicator, i.e. "drwx------". The JDK toString method returns
+      // a 9-character string, so prepend a leading character.
+      FsPermission fsPermission = FsPermission.valueOf(
+          "-" + PosixFilePermissions.toString(permissions));
+      FileUtil.setPermission(file, fsPermission);
+    }
+  }
+
+  /**
+   * The factory to create JksProviders, which is used by the ServiceLoader.
+   */
+  public static class Factory extends CredentialProviderFactory {
+    @Override
+    public CredentialProvider createProvider(URI providerName,
+        Configuration conf) throws IOException {
+      if (SCHEME_NAME.equals(providerName.getScheme())) {
+        return new LocalJavaKeyStoreProvider(providerName, conf);
+      }
+      return null;
+    }
+  }
+
+  private static Set<PosixFilePermission> modeToPosixFilePermission(
+      int mode) {
+    Set<PosixFilePermission> perms = EnumSet.noneOf(PosixFilePermission.class);
+    if ((mode & 0001) != 0) {
+      perms.add(PosixFilePermission.OTHERS_EXECUTE);
+    }
+    if ((mode & 0002) != 0) {
+      perms.add(PosixFilePermission.OTHERS_WRITE);
+    }
+    if ((mode & 0004) != 0) {
+      perms.add(PosixFilePermission.OTHERS_READ);
+    }
+    if ((mode & 0010) != 0) {
+      perms.add(PosixFilePermission.GROUP_EXECUTE);
+    }
+    if ((mode & 0020) != 0) {
+      perms.add(PosixFilePermission.GROUP_WRITE);
+    }
+    if ((mode & 0040) != 0) {
+      perms.add(PosixFilePermission.GROUP_READ);
+    }
+    if ((mode & 0100) != 0) {
+      perms.add(PosixFilePermission.OWNER_EXECUTE);
+    }
+    if ((mode & 0200) != 0) {
+      perms.add(PosixFilePermission.OWNER_WRITE);
+    }
+    if ((mode & 0400) != 0) {
+      perms.add(PosixFilePermission.OWNER_READ);
+    }
+    return perms;
+  }
+}

hadoop-common-project/hadoop-common/src/main/resources/META-INF/services/org.apache.hadoop.security.alias.CredentialProviderFactory

@@ -14,4 +14,5 @@
 # limitations under the License.
 
 org.apache.hadoop.security.alias.JavaKeyStoreProvider$Factory
+org.apache.hadoop.security.alias.LocalJavaKeyStoreProvider$Factory
 org.apache.hadoop.security.alias.UserProvider$Factory

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/alias/TestCredentialProviderFactory.java

@@ -207,7 +207,29 @@ public class TestCredentialProviderFactory {
     checkPermissionRetention(conf, ourUrl, path);
   }
 
-  public void checkPermissionRetention(Configuration conf, String ourUrl, 
+  @Test
+  public void testLocalJksProvider() throws Exception {
+    Configuration conf = new Configuration();
+    final Path jksPath = new Path(tmpDir.toString(), "test.jks");
+    final String ourUrl =
+        LocalJavaKeyStoreProvider.SCHEME_NAME + "://file" + jksPath.toUri();
+
+    File file = new File(tmpDir, "test.jks");
+    file.delete();
+    conf.set(CredentialProviderFactory.CREDENTIAL_PROVIDER_PATH, ourUrl);
+    checkSpecificProvider(conf, ourUrl);
+    Path path = ProviderUtils.unnestUri(new URI(ourUrl));
+    FileSystem fs = path.getFileSystem(conf);
+    FileStatus s = fs.getFileStatus(path);
+    assertTrue("Unexpected permissions: " + s.getPermission().toString(), s.getPermission().toString().equals("rwx------"));
+    assertTrue(file + " should exist", file.isFile());
+
+    // check permission retention after explicit change
+    fs.setPermission(path, new FsPermission("777"));
+    checkPermissionRetention(conf, ourUrl, path);
+  }
+
+  public void checkPermissionRetention(Configuration conf, String ourUrl,
       Path path) throws Exception {
     CredentialProvider provider = CredentialProviderFactory.getProviders(conf).get(0);
     // let's add a new credential and flush and check that permissions are still set to 777
@@ -233,3 +255,4 @@ public class TestCredentialProviderFactory {
     		"keystore.", s.getPermission().toString().equals("rwxrwxrwx"));
   }
 }
+