/*
* Copyright 2013-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.services.s3.internal.crypto;
import static com.amazonaws.services.s3.model.CryptoMode.AuthenticatedEncryption;
import static com.amazonaws.services.s3.model.CryptoMode.EncryptionOnly;
import java.io.File;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.services.s3.internal.S3Direct;
import com.amazonaws.services.s3.model.AbortMultipartUploadRequest;
import com.amazonaws.services.s3.model.CompleteMultipartUploadRequest;
import com.amazonaws.services.s3.model.CompleteMultipartUploadResult;
import com.amazonaws.services.s3.model.CopyPartRequest;
import com.amazonaws.services.s3.model.CopyPartResult;
import com.amazonaws.services.s3.model.CryptoConfiguration;
import com.amazonaws.services.s3.model.CryptoMode;
import com.amazonaws.services.s3.model.EncryptionMaterialsProvider;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.InitiateMultipartUploadRequest;
import com.amazonaws.services.s3.model.InitiateMultipartUploadResult;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutInstructionFileRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.PutObjectResult;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.UploadPartRequest;
import com.amazonaws.services.s3.model.UploadPartResult;
/**
* A proxy cryptographic module used to dispatch method calls to the appropriate
* underlying cryptographic module depending on the current configuration.
*/
public class CryptoModuleDispatcher extends S3CryptoModule<MultipartUploadContext> {
private final CryptoMode defaultCryptoMode;
/** Encryption only (EO) cryptographic module. */
private final S3CryptoModuleEO eo;
/** Authenticated encryption (AE) cryptographic module. */
private final S3CryptoModuleAE ae;
public CryptoModuleDispatcher(S3Direct s3,
AWSCredentialsProvider credentialsProvider,
EncryptionMaterialsProvider encryptionMaterialsProvider,
CryptoConfiguration cryptoConfig) {
cryptoConfig = cryptoConfig.clone(); // make a clone
CryptoMode cryptoMode = cryptoConfig.getCryptoMode();
if (cryptoMode == null) {
cryptoMode = EncryptionOnly;
cryptoConfig.setCryptoMode(cryptoMode); // defaults to EO
}
cryptoConfig = cryptoConfig.readOnly(); // make read-only
this.defaultCryptoMode = cryptoConfig.getCryptoMode();
switch(this.defaultCryptoMode) {
case StrictAuthenticatedEncryption:
this.ae = new S3CryptoModuleAEStrict(s3, credentialsProvider,
encryptionMaterialsProvider,
cryptoConfig);
this.eo = null;
break;
case AuthenticatedEncryption:
this.ae = new S3CryptoModuleAE(s3, credentialsProvider,
encryptionMaterialsProvider,
cryptoConfig);
this.eo = null;
break;
case EncryptionOnly:
this.eo = new S3CryptoModuleEO(s3, credentialsProvider,
encryptionMaterialsProvider,
cryptoConfig);
CryptoConfiguration aeConfig = cryptoConfig.clone();
try {
aeConfig.setCryptoMode(AuthenticatedEncryption);
} catch(UnsupportedOperationException ex) {
// BC not available during runtime; but EO can still work.
// Hence ignoring.
}
this.ae = new S3CryptoModuleAE(s3, credentialsProvider,
encryptionMaterialsProvider,
aeConfig.readOnly());
break;
default:
throw new IllegalStateException();
}
}
@Override
public PutObjectResult putObjectSecurely(PutObjectRequest putObjectRequest)
throws AmazonClientException, AmazonServiceException {
return defaultCryptoMode == EncryptionOnly
? eo.putObjectSecurely(putObjectRequest)
: ae.putObjectSecurely(putObjectRequest)
;
}
@Override
public S3Object getObjectSecurely(GetObjectRequest req)
throws AmazonClientException, AmazonServiceException {
// AE module can handle S3 objects encrypted in either AE or EO format
return ae.getObjectSecurely(req);
}
@Override
public ObjectMetadata getObjectSecurely(GetObjectRequest req, File destinationFile)
throws AmazonClientException, AmazonServiceException {
// AE module can handle S3 objects encrypted in either AE or EO format
return ae.getObjectSecurely(req, destinationFile);
}
@Override
public CompleteMultipartUploadResult completeMultipartUploadSecurely(
CompleteMultipartUploadRequest req)
throws AmazonClientException, AmazonServiceException {
return defaultCryptoMode == EncryptionOnly
? eo.completeMultipartUploadSecurely(req)
: ae.completeMultipartUploadSecurely(req)
;
}
@Override
public void abortMultipartUploadSecurely(AbortMultipartUploadRequest req) {
if (defaultCryptoMode == EncryptionOnly)
eo.abortMultipartUploadSecurely(req);
else
ae.abortMultipartUploadSecurely(req);
}
@Override
public InitiateMultipartUploadResult initiateMultipartUploadSecurely(
InitiateMultipartUploadRequest req)
throws AmazonClientException, AmazonServiceException {
return defaultCryptoMode == EncryptionOnly
? eo.initiateMultipartUploadSecurely(req)
: ae.initiateMultipartUploadSecurely(req)
;
}
/**
* {@inheritDoc}
*
* <p>
* <b>NOTE:</b> Because the encryption process requires context from block
* N-1 in order to encrypt block N, parts uploaded with the
* AmazonS3EncryptionClient (as opposed to the normal AmazonS3Client) must
* be uploaded serially, and in order. Otherwise, the previous encryption
* context isn't available to use when encrypting the current part.
*/
@Override
public UploadPartResult uploadPartSecurely(UploadPartRequest req)
throws AmazonClientException, AmazonServiceException {
return defaultCryptoMode == EncryptionOnly
? eo.uploadPartSecurely(req)
: ae.uploadPartSecurely(req)
;
}
@Override
public CopyPartResult copyPartSecurely(CopyPartRequest req) {
return defaultCryptoMode == EncryptionOnly
? eo.copyPartSecurely(req)
: ae.copyPartSecurely(req)
;
}
@Override
public PutObjectResult putInstructionFileSecurely(
PutInstructionFileRequest req) {
return defaultCryptoMode == EncryptionOnly
? eo.putInstructionFileSecurely(req)
: ae.putInstructionFileSecurely(req)
;
}
}