| /** |
| * 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.fs.azure; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Shell; |
| |
| /** |
| * Shell decryption key provider which invokes an external script that will |
| * perform the key decryption. |
| */ |
| @InterfaceAudience.Private |
| public class ShellDecryptionKeyProvider extends SimpleKeyProvider { |
| static final String KEY_ACCOUNT_SHELLKEYPROVIDER_SCRIPT = |
| "fs.azure.shellkeyprovider.script"; |
| |
| @Override |
| public String getStorageAccountKey(String accountName, Configuration conf) |
| throws KeyProviderException { |
| String envelope = super.getStorageAccountKey(accountName, conf); |
| |
| final String command = conf.get(KEY_ACCOUNT_SHELLKEYPROVIDER_SCRIPT); |
| if (command == null) { |
| throw new KeyProviderException( |
| "Script path is not specified via fs.azure.shellkeyprovider.script"); |
| } |
| |
| String[] cmd = command.split(" "); |
| String[] cmdWithEnvelope = Arrays.copyOf(cmd, cmd.length + 1); |
| cmdWithEnvelope[cmdWithEnvelope.length - 1] = envelope; |
| |
| String decryptedKey = null; |
| try { |
| decryptedKey = Shell.execCommand(cmdWithEnvelope); |
| } catch (IOException ex) { |
| throw new KeyProviderException(ex); |
| } |
| |
| // trim any whitespace |
| return decryptedKey.trim(); |
| } |
| } |