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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.hadoop.hdfs;
import static org.apache.hadoop.fs.CommonConfigurationKeys.DFS_CLIENT_IGNORE_NAMENODE_DEFAULT_KMS_URI;
import static org.apache.hadoop.fs.CommonConfigurationKeys.DFS_CLIENT_IGNORE_NAMENODE_DEFAULT_KMS_URI_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_CRYPTO_CODEC_CLASSES_KEY_PREFIX;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.security.GeneralSecurityException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.crypto.CipherSuite;
import org.apache.hadoop.crypto.CryptoCodec;
import org.apache.hadoop.crypto.CryptoInputStream;
import org.apache.hadoop.crypto.CryptoProtocolVersion;
import org.apache.hadoop.crypto.key.KeyProvider;
import org.apache.hadoop.crypto.key.KeyProvider.KeyVersion;
import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension;
import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.EncryptedKeyVersion;
import org.apache.hadoop.crypto.key.KeyProviderTokenIssuer;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.fs.FileEncryptionInfo;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.KMSUtil;
/**
* Utility class for key provider related methods in hdfs client package.
*
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public final class HdfsKMSUtil {
private static final String DFS_KMS_PREFIX = "dfs-kms-";
private static String keyProviderUriKeyName =
CommonConfigurationKeysPublic.HADOOP_SECURITY_KEY_PROVIDER_PATH;
private HdfsKMSUtil() { /* Hidden constructor */ }
/**
* Creates a new KeyProvider from the given Configuration.
*
* @param conf Configuration
* @return new KeyProvider, or null if no provider was found.
* @throws IOException if the KeyProvider is improperly specified in
* the Configuration
*/
public static KeyProvider createKeyProvider(
final Configuration conf) throws IOException {
return KMSUtil.createKeyProvider(conf, keyProviderUriKeyName);
}
/**
* Obtain the crypto protocol version from the provided FileEncryptionInfo,
* checking to see if this version is supported by.
*
* @param feInfo FileEncryptionInfo
* @return CryptoProtocolVersion from the feInfo
* @throws IOException if the protocol version is unsupported.
*/
public static CryptoProtocolVersion getCryptoProtocolVersion(
FileEncryptionInfo feInfo) throws IOException {
final CryptoProtocolVersion version = feInfo.getCryptoProtocolVersion();
if (!CryptoProtocolVersion.supports(version)) {
throw new IOException("Client does not support specified " +
"CryptoProtocolVersion " + version.getDescription() + " version " +
"number" + version.getVersion());
}
return version;
}
/**
* Obtain a CryptoCodec based on the CipherSuite set in a FileEncryptionInfo
* and the available CryptoCodecs configured in the Configuration.
*
* @param conf Configuration
* @param feInfo FileEncryptionInfo
* @return CryptoCodec
* @throws IOException if no suitable CryptoCodec for the CipherSuite is
* available.
*/
public static CryptoCodec getCryptoCodec(Configuration conf,
FileEncryptionInfo feInfo) throws IOException {
final CipherSuite suite = feInfo.getCipherSuite();
if (suite.equals(CipherSuite.UNKNOWN)) {
throw new IOException("NameNode specified unknown CipherSuite with ID "
+ suite.getUnknownValue() + ", cannot instantiate CryptoCodec.");
}
final CryptoCodec codec = CryptoCodec.getInstance(conf, suite);
if (codec == null) {
throw new UnknownCipherSuiteException(
"No configuration found for the cipher suite "
+ suite.getConfigSuffix() + " prefixed with "
+ HADOOP_SECURITY_CRYPTO_CODEC_CLASSES_KEY_PREFIX
+ ". Please see the example configuration "
+ "hadoop.security.crypto.codec.classes.EXAMPLECIPHERSUITE "
+ "at core-default.xml for details.");
}
return codec;
}
/**
* The key provider uri is searched in the following order.
* 1. If there is a mapping in Credential's secrets map for namenode uri.
* 2. From namenode getServerDefaults call.
* 3. Finally fallback to local conf.
* @return keyProviderUri if found from either of above 3 cases,
* null otherwise
* @throws IOException
*/
public static URI getKeyProviderUri(UserGroupInformation ugi,
URI namenodeUri, String keyProviderUriStr, Configuration conf)
throws IOException {
URI keyProviderUri = null;
// Lookup the secret in credentials object for namenodeuri.
Credentials credentials = ugi.getCredentials();
Text credsKey = getKeyProviderMapKey(namenodeUri);
byte[] keyProviderUriBytes =
credentials.getSecretKey(credsKey);
if(keyProviderUriBytes != null) {
keyProviderUri =
URI.create(DFSUtilClient.bytes2String(keyProviderUriBytes));
}
if (keyProviderUri == null) {
// Check if NN provided uri is not null and ignore property is false.
if (keyProviderUriStr != null && !conf.getBoolean(
DFS_CLIENT_IGNORE_NAMENODE_DEFAULT_KMS_URI,
DFS_CLIENT_IGNORE_NAMENODE_DEFAULT_KMS_URI_DEFAULT)) {
if (!keyProviderUriStr.isEmpty()) {
keyProviderUri = URI.create(keyProviderUriStr);
}
}
// Fallback to configuration.
if (keyProviderUri == null) {
// Either NN is old and doesn't report provider or ignore NN KMS
// provider property is set to true, so use conf.
keyProviderUri = KMSUtil.getKeyProviderUri(conf, keyProviderUriKeyName);
}
if (keyProviderUri != null) {
credentials.addSecretKey(
credsKey, DFSUtilClient.string2Bytes(keyProviderUri.toString()));
}
}
return keyProviderUri;
}
public static KeyProvider getKeyProvider(KeyProviderTokenIssuer issuer,
Configuration conf)
throws IOException {
URI keyProviderUri = issuer.getKeyProviderUri();
if (keyProviderUri != null) {
return KMSUtil.createKeyProviderFromUri(conf, keyProviderUri);
}
return null;
}
/**
* Returns a key to map namenode uri to key provider uri.
* Tasks will lookup this key to find key Provider.
*/
public static Text getKeyProviderMapKey(URI namenodeUri) {
return new Text(DFS_KMS_PREFIX + namenodeUri.getScheme()
+"://" + namenodeUri.getAuthority());
}
public static CryptoInputStream createWrappedInputStream(InputStream is,
KeyProvider keyProvider, FileEncryptionInfo fileEncryptionInfo,
Configuration conf) throws IOException {
// File is encrypted, wrap the stream in a crypto stream.
// Currently only one version, so no special logic based on the version#
HdfsKMSUtil.getCryptoProtocolVersion(fileEncryptionInfo);
final CryptoCodec codec = HdfsKMSUtil.getCryptoCodec(
conf, fileEncryptionInfo);
final KeyVersion decrypted =
decryptEncryptedDataEncryptionKey(fileEncryptionInfo, keyProvider);
return new CryptoInputStream(is, codec, decrypted.getMaterial(),
fileEncryptionInfo.getIV());
}
/**
* Decrypts a EDEK by consulting the KeyProvider.
*/
static KeyVersion decryptEncryptedDataEncryptionKey(FileEncryptionInfo
feInfo, KeyProvider keyProvider) throws IOException {
if (keyProvider == null) {
throw new IOException("No KeyProvider is configured, cannot access" +
" an encrypted file");
}
EncryptedKeyVersion ekv = EncryptedKeyVersion.createForDecryption(
feInfo.getKeyName(), feInfo.getEzKeyVersionName(), feInfo.getIV(),
feInfo.getEncryptedDataEncryptionKey());
try {
KeyProviderCryptoExtension cryptoProvider = KeyProviderCryptoExtension
.createKeyProviderCryptoExtension(keyProvider);
return cryptoProvider.decryptEncryptedKey(ekv);
} catch (GeneralSecurityException e) {
throw new IOException(e);
}
}
}
