需要在 S3 存储桶策略中使用特定密钥 ID 进行 KMS 加密

Question

我正在尝试要求放入存储桶中的所有对象都使用特定的 KMS 密钥进行加密。我设法要求 KMS 加密，但密钥规范不起作用。这是我的当前策略（没有真实的存储桶名称和 ID）：

{
    "Version": "2012-10-17",
    "Id": "PutObjPolicy",
    "Statement": [
        {
            "Sid": "DenyInsecureCommunications",
            "Effect": "Deny",
            "Principal": {
                "AWS": "*"
            },
            "Action": "s3:*",
            "Resource": "arn:aws:s3:::bucket1,
            "Condition": {
                "Bool": {
                    "aws:SecureTransport": "false"
                }
            }
        },
        {
            "Sid": "DenyIncorrectEncryptionHeader",
            "Effect": "Deny",
            "Principal": "*",
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::bucket1/*",
            "Condition": {
                "StringNotEquals": {
                    "s3:x-amz-server-side-encryption": "aws:kms",
                    "s3:x-amz-server-side-encryption-aws-kms-key-id": "arn:aws:kms:eu-central-1:123456789:key/12345-123-notmy-keyid-1234566"
                }
            }
        },

        {
            "Sid": "DenyUnEncryptedObjectUploads",
            "Effect": "Deny",
            "Principal": "*",
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::bucket1/*",
            "Condition": {
                "Null": {
                    "s3:x-amz-server-side-encryption": "true"
                }
            }
        }
    ]
}

这正确地拒绝了没有指定任何服务器端加密的上传，但它仍然允许使用默认的 s3 密钥。

Answer 1

If there are multiple condition operators, or if there are multiple keys attached to a single condition operator, the conditions are evaluated using a logical AND.

http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html#Condition

这表明双重条件策略只会在 两个 字符串不相等时拒绝（也就是说，如果不使用加密 and key-id 错误）。

分离测试 s3:x-amz-server-side-encryption 和 s3:x-amz-server-side-encryption-aws-kms-key-id 分成两个单独的 Deny 政策声明应该是解决方法。