在 Amazon S3 中使用 KMS 密钥解密文件时出错

Question

我正在尝试使用 Amazon S3 作为加密文件系统。

我使用 KMS 加密密钥（服务器端加密）成功实现了在 AWS S3 服务器上上传文件。请找到以下工作代码：

对于加密：

private static final String AWS_KMS_KEY = "---KMS Key---"
private static final String BUCKET_NAME = "---bucket name---"
private static final String keyName = "---display key name---"
private static final String filePath = "---File Path---"
private static final String ACCESS_KEY_ID = "---aws accesskey---"
private static final String SECRET_ACCESS_KEY = "---aws secret key---"

AWSCredentials awsCredentials = new BasicAWSCredentials(ACCESS_KEY_ID, SECRET_ACCESS_KEY);
AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(awsCredentials))
    .withRegion(Regions.US_WEST_2).withForceGlobalBucketAccessEnabled(true).build();

FileInputStream stream = new FileInputStream(filePath);

ObjectMetadata objectMetadata = new ObjectMetadata();
objectMetadata.setSSEAlgorithm(SSEAlgorithm.KMS.getAlgorithm());

PutObjectRequest putObjectRequest = new PutObjectRequest(amazonFileUploadLocationOriginal, keyName, stream, objectMetadata);
putObjectRequest.withCannedAcl(CannedAccessControlList.PublicRead);
putObjectRequest.withSSEAwsKeyManagementParams(new SSEAwsKeyManagementParams(AWS_KMS_KEY));

PutObjectResult result = s3Client.putObject(putObjectRequest);

我在使用服务器端解密检索文件时遇到问题。我想直接访问 aws url 以通过解密检索该文件。请找到以下不起作用的代码：

对象读取：

不使用 KMS 密钥读取对象：

GetObjectRequest request = new GetObjectRequest(existingBucketName, amazonFileUploadLocationOriginal);
s3Client.getUrl(BUCKET_NAME, keyName);

以上代码用于没有 kms 加密密钥的读取对象，显示以下错误。

Code : InvalidArgument

Message : Requests specifying Server Side Encryption with AWS KMS managed keys require AWS Signature Version 4.

使用 KMS 密钥读取对象：

GeneratePresignedUrlRequest genreq = new GeneratePresignedUrlRequest(BUCKET_NAME, keyName, HttpMethod.GET)
            .withSSEAlgorithm(SSEAlgorithm.KMS)
            .withKmsCmkId(AWS_KMS_KEY);

URL puturl = s3Client.generatePresignedUrl(genreq);

以上代码是针对带有 kms 加密密钥前缀 URL 的读取对象，显示以下错误。

Code : SignatureDoesNotMatch

Message : The request signature we calculated does not match the signature you provided. Check your key and signing method.

这样做正确吗？有什么建议吗？请帮忙。

Answer 1

如果签名不匹配请使用以下代码手动添加供参考

System.setProperty(SDKGlobalConfiguration.ENABLE_S3_SIGV4_SYSTEM_PROPERTY, "true");

我们可以使用下面的代码获得主持URL获得

GeneratePresignedUrlRequest genreq = new GeneratePresignedUrlRequest(BUCKET_NAME, keyName, HttpMethod.GET)
 .withExpiration(expiration);

URL puturl = s3Client.generatePresignedUrl(genreq);

此URL 将包含到期时间和签名，如下所示

输出

https://mybucket.s3.amazonaws.com/abc_count.png?AWSAccessKeyId=AKIAJXXXXXXXXXXXXXXX&Expires=1503602631&Signature=ibOGfAovnhIF13DALdAgsdtg2s%3D

希望有人帮助回答

在 Amazon S3 中使用 KMS 密钥解密文件时出错

Error while decrypting file using KMS key in Amazon S3

java

encryption

amazon-s3

amazon-web-services

aws-kms