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/*
*
* 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.qpid.server.security.encryption;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.security.NoSuchAlgorithmException;
import java.util.EnumSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.qpid.server.BrokerOptions;
import org.apache.qpid.server.configuration.IllegalConfigurationException;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.plugin.ConfigurationSecretEncrypterFactory;
import org.apache.qpid.server.plugin.PluggableService;
@PluggableService
public class AESKeyFileEncrypterFactory implements ConfigurationSecretEncrypterFactory
{
static final String ENCRYPTER_KEY_FILE = "encrypter.key.file";
private static final int AES_KEY_SIZE_BITS = 256;
private static final int AES_KEY_SIZE_BYTES = AES_KEY_SIZE_BITS / 8;
private static final String AES_ALGORITHM = "AES";
public static final String TYPE = "AESKeyFile";
static final String DEFAULT_KEYS_SUBDIR_NAME = ".keys";
@Override
public ConfigurationSecretEncrypter createEncrypter(final ConfiguredObject<?> object)
{
String fileLocation;
if(object.getContextKeys(false).contains(ENCRYPTER_KEY_FILE))
{
fileLocation = object.getContextValue(String.class, ENCRYPTER_KEY_FILE);
}
else
{
fileLocation = object.getContextValue(String.class, BrokerOptions.QPID_WORK_DIR)
+ File.separator + DEFAULT_KEYS_SUBDIR_NAME + File.separator
+ object.getCategoryClass().getSimpleName() + "_"
+ object.getName() + ".key";
Map<String, String> context = object.getContext();
Map<String, String> modifiedContext = new LinkedHashMap<>(context);
modifiedContext.put(ENCRYPTER_KEY_FILE, fileLocation);
object.setAttribute(ConfiguredObject.CONTEXT, context, modifiedContext);
}
File file = new File(fileLocation);
if(!file.exists())
{
createAndPopulateKeyFile(file);
}
if(!file.isFile())
{
throw new IllegalArgumentException("File '"+fileLocation+"' is not a regular file.");
}
try
{
Set<PosixFilePermission> permissions = Files.getPosixFilePermissions(file.toPath());
if (permissions.contains(PosixFilePermission.GROUP_READ)
|| permissions.contains(PosixFilePermission.OTHERS_READ)
|| permissions.contains(PosixFilePermission.GROUP_WRITE)
|| permissions.contains(PosixFilePermission.OTHERS_WRITE))
{
throw new IllegalArgumentException("Key file '"
+ fileLocation
+ "' has incorrect permissions. Only the owner "
+ "should be able to read or write this file.");
}
if(Files.size(file.toPath()) != AES_KEY_SIZE_BYTES)
{
throw new IllegalArgumentException("Key file '" + fileLocation + "' contains an incorrect about of data");
}
try(FileInputStream inputStream = new FileInputStream(file))
{
byte[] key = new byte[AES_KEY_SIZE_BYTES];
int pos = 0;
int read;
while(pos < key.length && -1 != ( read = inputStream.read(key, pos, key.length - pos)))
{
pos += read;
}
if(pos != key.length)
{
throw new IllegalConfigurationException("Key file '" + fileLocation + "' contained an incorrect about of data");
}
SecretKeySpec keySpec = new SecretKeySpec(key, AES_ALGORITHM);
return new AESKeyFileEncrypter(keySpec);
}
}
catch (IOException e)
{
throw new IllegalConfigurationException("Unable to get file permissions: " + e.getMessage(), e);
}
}
private void createAndPopulateKeyFile(final File file)
{
try
{
Set<PosixFilePermission> ownerOnly = EnumSet.of(PosixFilePermission.OWNER_READ,
PosixFilePermission.OWNER_WRITE,
PosixFilePermission.OWNER_EXECUTE);
Files.createDirectories(file.getParentFile().toPath(), PosixFilePermissions.asFileAttribute(ownerOnly));
Files.createFile(file.toPath(), PosixFilePermissions.asFileAttribute(
EnumSet.of(PosixFilePermission.OWNER_READ, PosixFilePermission.OWNER_WRITE)));
KeyGenerator keyGenerator = KeyGenerator.getInstance(AES_ALGORITHM);
keyGenerator.init(AES_KEY_SIZE_BITS);
SecretKey key = keyGenerator.generateKey();
try(FileOutputStream os = new FileOutputStream(file))
{
os.write(key.getEncoded());
}
Files.setPosixFilePermissions(file.toPath(), EnumSet.of(PosixFilePermission.OWNER_READ));
}
catch (NoSuchAlgorithmException | IOException e)
{
throw new IllegalArgumentException("Cannot create key file: " + e.getMessage(), e);
}
}
@Override
public String getType()
{
return TYPE;
}
}
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