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/*
* Copyright 2010-2019 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.
* According to cos feature, we modify some class，comment, field name, etc.
*/
package com.qcloud.cos.internal.crypto;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Map;
import com.qcloud.cos.auth.COSCredentialsProvider;
import com.qcloud.cos.exception.CosClientException;
import com.qcloud.cos.internal.COSDirect;
import com.qcloud.cos.model.COSObject;
import com.qcloud.cos.model.COSObjectId;
import com.qcloud.cos.model.COSObjectInputStream;
import com.qcloud.cos.model.EncryptedGetObjectRequest;
import com.qcloud.cos.model.GetObjectRequest;
import com.qcloud.cos.model.InitiateMultipartUploadRequest;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.UploadPartRequest;
import com.qcloud.cos.utils.IOUtils;
import com.qcloud.cos.utils.Jackson;
public class COSCryptoModuleAE extends COSCryptoModuleBase {
static {
// Enable bouncy castle if available
CryptoRuntime.enableBouncyCastle();
}
public COSCryptoModuleAE(COSDirect cos, COSCredentialsProvider credentialsProvider,
EncryptionMaterialsProvider kekMaterialsProvider, CryptoConfiguration cryptoConfig) {
this(null, cos, credentialsProvider, kekMaterialsProvider, cryptoConfig);
}
public COSCryptoModuleAE(QCLOUDKMS kms, COSDirect cos,
COSCredentialsProvider credentialsProvider,
EncryptionMaterialsProvider kekMaterialsProvider, CryptoConfiguration cryptoConfig) {
super(kms, cos, credentialsProvider, kekMaterialsProvider, cryptoConfig);
}
/**
* Returns true if a strict encryption mode is in use in the current crypto module; false
* otherwise.
*/
protected boolean isStrict() {
return false;
}
@Override
public COSObject getObjectSecurely(GetObjectRequest req) {
// Adjust the crypto range to retrieve all of the cipher blocks needed to contain the user's
// desired
// range of bytes.
long[] desiredRange = req.getRange();
if (isStrict() && (desiredRange != null))
throw new SecurityException(
"Range get and getting a part are not allowed in strict crypto mode");
long[] adjustedCryptoRange = getAdjustedCryptoRange(desiredRange);
if (adjustedCryptoRange != null)
req.setRange(adjustedCryptoRange[0], adjustedCryptoRange[1]);
// Get the object from COS
COSObject retrieved = cos.getObject(req);
// If the caller has specified constraints, it's possible that super.getObject(...)
// would return null, so we simply return null as well.
if (retrieved == null)
return null;
String suffix = null;
if (req instanceof EncryptedGetObjectRequest) {
EncryptedGetObjectRequest ereq = (EncryptedGetObjectRequest) req;
suffix = ereq.getInstructionFileSuffix();
}
try {
return suffix == null || suffix.trim().isEmpty()
? decipher(req, desiredRange, adjustedCryptoRange, retrieved)
: decipherWithInstFileSuffix(req, desiredRange, adjustedCryptoRange, retrieved,
suffix);
} catch (RuntimeException ex) {
// If we're unable to set up the decryption, make sure we close the
// HTTP connection
IOUtils.closeQuietly(retrieved, log);
throw ex;
} catch (Error error) {
IOUtils.closeQuietly(retrieved, log);
throw error;
}
}
private COSObject decipher(GetObjectRequest req, long[] desiredRange, long[] cryptoRange,
COSObject retrieved) {
COSObjectWrapper wrapped = new COSObjectWrapper(retrieved, req.getCOSObjectId());
// Check if encryption info is in object metadata
if (wrapped.hasEncryptionInfo())
return decipherWithMetadata(req, desiredRange, cryptoRange, wrapped);
// Check if encrypted info is in an instruction file
COSObjectWrapper ifile = fetchInstructionFile(req.getCOSObjectId(), null);
if (ifile != null) {
try {
return decipherWithInstructionFile(req, desiredRange, cryptoRange, wrapped, ifile);
} finally {
IOUtils.closeQuietly(ifile, log);
}
}
if (isStrict() || !cryptoConfig.isIgnoreMissingInstructionFile()) {
IOUtils.closeQuietly(wrapped, log);
throw new SecurityException(
"Instruction file not found for COS object with bucket name: "
+ retrieved.getBucketName() + ", key: " + retrieved.getKey());
}
// To keep backward compatible:
// ignore the missing instruction file and treat the object as un-encrypted.
log.warn(String.format(
"Unable to detect encryption information for object '%s' in bucket '%s'. "
+ "Returning object without decryption.",
retrieved.getKey(), retrieved.getBucketName()));
// Adjust the output to the desired range of bytes.
COSObjectWrapper adjusted = adjustToDesiredRange(wrapped, desiredRange, null);
return adjusted.getCOSObject();
}
/**
* Same as {@link #decipher(GetObjectRequest, long[], long[], COSObject)} but makes use of an
* instruction file with the specified suffix.
*
* @param instFileSuffix never null or empty (which is assumed to have been sanitized upstream.)
*/
private COSObject decipherWithInstFileSuffix(GetObjectRequest req, long[] desiredRange,
long[] cryptoRange, COSObject retrieved, String instFileSuffix) {
final COSObjectId id = req.getCOSObjectId();
// Check if encrypted info is in an instruction file
final COSObjectWrapper ifile = fetchInstructionFile(id, instFileSuffix);
if (ifile == null) {
throw new CosClientException("Instruction file with suffix " + instFileSuffix
+ " is not found for " + retrieved);
}
try {
return decipherWithInstructionFile(req, desiredRange, cryptoRange,
new COSObjectWrapper(retrieved, id), ifile);
} finally {
IOUtils.closeQuietly(ifile, log);
}
}
private COSObject decipherWithInstructionFile(GetObjectRequest req, long[] desiredRange,
long[] cryptoRange, COSObjectWrapper retrieved, COSObjectWrapper instructionFile) {
boolean keyWrapExpected = isStrict();
if (req instanceof EncryptedGetObjectRequest) {
EncryptedGetObjectRequest ereq = (EncryptedGetObjectRequest) req;
if (!keyWrapExpected)
keyWrapExpected = ereq.isKeyWrapExpected();
}
String json = instructionFile.toJsonString();
@SuppressWarnings("unchecked")
Map matdesc =
Collections.unmodifiableMap(Jackson.fromJsonString(json, Map.class));
ContentCryptoMaterial cekMaterial = ContentCryptoMaterial.fromInstructionFile(matdesc,
kekMaterialsProvider, cryptoConfig.getCryptoProvider(), cryptoRange, // range is
// sometimes
// necessary to
// compute the
// adjusted IV
keyWrapExpected, kms);
securityCheck(cekMaterial, retrieved);
COSObjectWrapper decrypted = decrypt(retrieved, cekMaterial, cryptoRange);
// Adjust the output to the desired range of bytes.
COSObjectWrapper adjusted = adjustToDesiredRange(decrypted, desiredRange, matdesc);
return adjusted.getCOSObject();
}
private COSObject decipherWithMetadata(GetObjectRequest req, long[] desiredRange,
long[] cryptoRange, COSObjectWrapper retrieved) {
boolean keyWrapExpected = isStrict();
if (req instanceof EncryptedGetObjectRequest) {
EncryptedGetObjectRequest ereq = (EncryptedGetObjectRequest) req;
if (!keyWrapExpected)
keyWrapExpected = ereq.isKeyWrapExpected();
}
ContentCryptoMaterial cekMaterial =
ContentCryptoMaterial.fromObjectMetadata(retrieved.getObjectMetadata(),
kekMaterialsProvider, cryptoConfig.getCryptoProvider(),
// range is sometimes necessary to compute the adjusted IV
cryptoRange, keyWrapExpected, kms);
securityCheck(cekMaterial, retrieved);
COSObjectWrapper decrypted = decrypt(retrieved, cekMaterial, cryptoRange);
// Adjust the output to the desired range of bytes.
COSObjectWrapper adjusted = adjustToDesiredRange(decrypted, desiredRange, null);
return adjusted.getCOSObject();
}
/**
* Adjusts the retrieved COSObject so that the object contents contain only the range of bytes
* desired by the user. Since encrypted contents can only be retrieved in CIPHER_BLOCK_SIZE (16
* bytes) chunks, the COSObject potentially contains more bytes than desired, so this method
* adjusts the contents range.
*
* @param cosObject The COSObject retrieved from COS that could possibly contain more bytes than
* desired by the user.
* @param range A two-element array of longs corresponding to the start and finish (inclusive)
* of a desired range of bytes.
* @param instruction Instruction file in JSON or null if no instruction file is involved
* @return The COSObject with adjusted object contents containing only the range desired by the
* user. If the range specified is invalid, then the COSObject is returned without any
* modifications.
*/
protected final COSObjectWrapper adjustToDesiredRange(COSObjectWrapper cosObject, long[] range,
Map instruction) {
if (range == null)
return cosObject;
// Figure out the original encryption scheme used, which can be
// different from the crypto scheme used for decryption.
ContentCryptoScheme encryptionScheme = cosObject.encryptionSchemeOf(instruction);
// range get on data encrypted using AES_GCM
final long instanceLen = cosObject.getObjectMetadata().getInstanceLength();
final long maxOffset = instanceLen - encryptionScheme.getTagLengthInBits() / 8 - 1;
if (range[1] > maxOffset) {
range[1] = maxOffset;
if (range[0] > range[1]) {
// Return empty content
// First let's close the existing input stream to avoid resource
// leakage
IOUtils.closeQuietly(cosObject.getObjectContent(), log);
cosObject.setObjectContent(new ByteArrayInputStream(new byte[0]));
return cosObject;
}
}
if (range[0] > range[1]) {
// Make no modifications if range is invalid.
return cosObject;
}
try {
COSObjectInputStream objectContent = cosObject.getObjectContent();
InputStream adjustedRangeContents =
new AdjustedRangeInputStream(objectContent, range[0], range[1]);
cosObject.setObjectContent(new COSObjectInputStream(adjustedRangeContents,
objectContent.getHttpRequest()));
return cosObject;
} catch (IOException e) {
throw new CosClientException(
"Error adjusting output to desired byte range: " + e.getMessage());
}
}
@Override
public ObjectMetadata getObjectSecurely(GetObjectRequest getObjectRequest,
File destinationFile) {
assertParameterNotNull(destinationFile,
"The destination file parameter must be specified when downloading an object directly to a file");
COSObject cosObject = getObjectSecurely(getObjectRequest);
// getObject can return null if constraints were specified but not met
if (cosObject == null)
return null;
OutputStream outputStream = null;
try {
outputStream = new BufferedOutputStream(new FileOutputStream(destinationFile));
byte[] buffer = new byte[1024 * 10];
int bytesRead;
while ((bytesRead = cosObject.getObjectContent().read(buffer)) > -1) {
outputStream.write(buffer, 0, bytesRead);
}
} catch (IOException e) {
throw new CosClientException(
"Unable to store object contents to disk: " + e.getMessage(), e);
} finally {
IOUtils.closeQuietly(outputStream, log);
IOUtils.closeQuietly(cosObject.getObjectContent(), log);
}
/*
* Unlike the standard Client, the Encryption Client does not do an MD5 check
* here because the contents stored in COS and the contents we just retrieved are different. In
* COS, the stored contents are encrypted, and locally, the retrieved contents are decrypted.
*/
return cosObject.getObjectMetadata();
}
@Override
final MultipartUploadCryptoContext newUploadContext(InitiateMultipartUploadRequest req,
ContentCryptoMaterial cekMaterial) {
return new MultipartUploadCryptoContext(req.getBucketName(), req.getKey(), cekMaterial);
}
//// specific overrides for uploading parts.
@Override
final CipherLite cipherLiteForNextPart(MultipartUploadCryptoContext uploadContext) {
return uploadContext.getCipherLite();
}
@Override
final long computeLastPartSize(UploadPartRequest req) {
return req.getPartSize() + (contentCryptoScheme.getTagLengthInBits() / 8);
}
/*
* Private helper methods
*/
/**
* Returns an updated object where the object content input stream contains the decrypted
* contents.
*
* @param wrapper The object whose contents are to be decrypted.
* @param cekMaterial The instruction that will be used to decrypt the object data.
* @return The updated object where the object content input stream contains the decrypted
* contents.
*/
private COSObjectWrapper decrypt(COSObjectWrapper wrapper, ContentCryptoMaterial cekMaterial,
long[] range) {
COSObjectInputStream objectContent = wrapper.getObjectContent();
wrapper.setObjectContent(new COSObjectInputStream(new CipherLiteInputStream(objectContent,
cekMaterial.getCipherLite(), DEFAULT_BUFFER_SIZE), objectContent.getHttpRequest()));
return wrapper;
}
/**
* Asserts that the specified parameter value is not null and if it is, throws an
* IllegalArgumentException with the specified error message.
*
* @param parameterValue The parameter value being checked.
* @param errorMessage The error message to include in the IllegalArgumentException if the
* specified parameter is null.
*/
private void assertParameterNotNull(Object parameterValue, String errorMessage) {
if (parameterValue == null)
throw new IllegalArgumentException(errorMessage);
}
@Override
protected long ciphertextLength(long originalContentLength) {
// Add 16 bytes for the 128-bit tag length using AES/GCM
return originalContentLength + contentCryptoScheme.getTagLengthInBits() / 8;
}
}
