使用默认kms密钥进行s3跨帐户访问

Question

我的账户中有一个s3存储桶，它使用默认的aws-kms密钥启用了SSE。我希望为我的存储桶提供对另一个帐户的读取访问权限。

我已经通过以下链接提供了访问：https://aws.amazon.com/premiumsupport/knowledge-center/cross-account-access-denied-error-s3/

我正在使用aws s3 ls <s3://bucket_name>和aws s3 cp <path to s3 object> .下载对象

我尝试在没有启用SSE的情况下提供对存储桶的跨账号访问。我成功地检索到了存储桶详细信息并下载了对象。但是，当我尝试从启用了SSE存储桶中下载对象时，我得到了An error occurred (AccessDenied) when calling the GetObject operation: Access Denied异常。我可以列出启用SSE的存储桶中的对象，但不能下载它们。

我的存储桶策略：

{
    "Version": "2008-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::<Account_B_AWS_Account_Id>:role/ReadOnly"
                ]
            },
            "Action": [
                "s3:GetObject",
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::<bucket-name>",
                "arn:aws:s3:::<bucket-name>/*"
            ]
        },
        {
            "Sid": "Allow use of the key",
            "Effect": "Allow",
            "Principal": {
              "AWS": [
                    "arn:aws:iam::<Account_B_AWS_Account_Id>:role/ReadOnly"
              ]
            },
            "Action": [
              "kms:Encrypt",
              "kms:Decrypt",
              "kms:ReEncrypt*",
              "kms:GenerateDataKey*",
              "kms:DescribeKey"
            ],
            "Resource": "*"
        }
    ]
}

帐户中的ReadOnly角色对所有亚马逊网络服务具有读取权限。此外，我还将以下策略附加到该角色

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "SomeProperites",
            "Effect": "Allow",
            "Action": [
                "s3:GetLifecycleConfiguration",
                "s3:ListBucketByTags",
                "s3:GetBucketTagging",
                "s3:GetInventoryConfiguration",
                "s3:GetObjectVersionTagging",
                "s3:GetBucketLogging",
                "s3:ListBucketVersions",
                "s3:GetAccelerateConfiguration",
                "s3:ListBucket",
                "s3:GetBucketPolicy",
                "s3:GetEncryptionConfiguration",
                "s3:GetObjectAcl",
                "s3:GetObjectVersionTorrent",
                "s3:GetBucketRequestPayment",
                "s3:GetObjectVersionAcl",
                "s3:GetObjectTagging",
                "s3:GetMetricsConfiguration",
                "s3:GetBucketPolicyStatus",
                "s3:GetBucketPublicAccessBlock",
                "s3:ListBucketMultipartUploads",
                "s3:GetBucketWebsite",
                "s3:GetBucketVersioning",
                "s3:GetBucketAcl",
                "s3:GetBucketNotification",
                "s3:GetReplicationConfiguration",
                "s3:ListMultipartUploadParts",
                "s3:GetObject",
                "s3:GetObjectTorrent",
                "s3:DescribeJob",
                "s3:GetBucketCORS",
                "s3:GetAnalyticsConfiguration",
                "s3:GetObjectVersionForReplication",
                "s3:GetBucketLocation",
                "s3:GetObjectVersion"
            ],
            "Resource": "arn:aws:s3:::<bucket-name>"
        },
        {
            "Sid": "SomePermission",
            "Effect": "Allow",
            "Action": [
                "s3:GetAccountPublicAccessBlock",
                "s3:ListAllMyBuckets",
                "s3:ListJobs",
                "s3:HeadBucket"
            ],
            "Resource": "*"
        },
        {
            "Sid": "KMSWriteKey",
            "Effect": "Allow",
            "Action": [
                "kms:Encrypt",
                "kms:Decrypt",
                "kms:ReEncrypt*",
                "kms:GenerateDataKey*",
                "kms:DescribeKey"
            ],
            "Resource": "*"
        }
    ]
}

我相信由于KMS解密，我无法进行getObject，因为我可以使用禁用SSE的存储桶下载。我上面的政策正确吗？如果使用默认的kms密钥，是否需要提供一些额外的权限？是否可以使用默认kms密钥并提供跨账号访问？

Answer 1

使用默认-> -kms密钥启用了aws SSE

这是AWS托管KMS密钥，您只能查看其密钥策略。您不能对其密钥策略进行编辑。因此，您将无法使用SSE-KMS AWS管理密钥进行跨帐户s3对象共享。

请切换使用SSE-KMS Customer Managed Key，并在所选KMS主密钥中向跨账号主体授予descrypt操作。

Answer 2

要向帐户B中的用户授予对帐户A中的AWS KMS加密桶的访问权限，您必须具备以下权限：

• 帐户A中的存储桶策略必须向帐户B授予访问权限。
• 帐户A中的AWS KMS密钥策略必须向帐户B中的用户授予访问权限。
• 帐户B中的AWS身份和访问管理用户策略必须向用户授予对帐户A中的存储桶和密钥的访问权限。

请在此处查看更多信息：

https://aws.amazon.com/premiumsupport/knowledge-center/cross-account-access-denied-error-s3/