| /** |
| * 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 java.io.IOException; |
| import java.net.URI; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.security.Credentials; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| /** |
| * A CredentialProvider for UGIs. It uses the credentials object associated |
| * with the current user to find credentials. This provider is created using a |
| * URI of "user:///". |
| */ |
| @InterfaceAudience.Private |
| public class UserProvider extends CredentialProvider { |
| public static final String SCHEME_NAME = "user"; |
| private final UserGroupInformation user; |
| private final Credentials credentials; |
| |
| private UserProvider() throws IOException { |
| user = UserGroupInformation.getCurrentUser(); |
| credentials = user.getCredentials(); |
| } |
| |
| @Override |
| public boolean isTransient() { |
| return true; |
| } |
| |
| @Override |
| public CredentialEntry getCredentialEntry(String alias) { |
| byte[] bytes = credentials.getSecretKey(new Text(alias)); |
| if (bytes == null) { |
| return null; |
| } |
| return new CredentialEntry( |
| alias, new String(bytes, StandardCharsets.UTF_8).toCharArray()); |
| } |
| |
| @Override |
| public CredentialEntry createCredentialEntry(String name, char[] credential) |
| throws IOException { |
| Text nameT = new Text(name); |
| if (credentials.getSecretKey(nameT) != null) { |
| throw new IOException("Credential " + name + |
| " already exists in " + this); |
| } |
| credentials.addSecretKey(new Text(name), |
| new String(credential).getBytes("UTF-8")); |
| return new CredentialEntry(name, credential); |
| } |
| |
| @Override |
| public void deleteCredentialEntry(String name) throws IOException { |
| byte[] cred = credentials.getSecretKey(new Text(name)); |
| if (cred != null) { |
| credentials.removeSecretKey(new Text(name)); |
| } |
| else { |
| throw new IOException("Credential " + name + |
| " does not exist in " + this); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return SCHEME_NAME + ":///"; |
| } |
| |
| @Override |
| public void flush() { |
| user.addCredentials(credentials); |
| } |
| |
| public static class Factory extends CredentialProviderFactory { |
| |
| @Override |
| public CredentialProvider createProvider(URI providerName, |
| Configuration conf) throws IOException { |
| if (SCHEME_NAME.equals(providerName.getScheme())) { |
| return new UserProvider(); |
| } |
| return null; |
| } |
| } |
| |
| @Override |
| public List<String> getAliases() throws IOException { |
| List<String> list = new ArrayList<String>(); |
| List<Text> aliases = credentials.getAllSecretKeys(); |
| for (Text key : aliases) { |
| list.add(key.toString()); |
| } |
| return list; |
| } |
| } |