Objects can be encrypted with S3 Managed Keys (SSE-S3), KMS Managed Keys (SSE-KMS), or Customer Provided Keys (SSE-C). If Server-side encryption is set to AWS-KMS master-key (SSE-KMS), but the KMS master key ARN of the configured CMK is arn:aws:kms:us-east-1:<aws-account-id>:alias/aws/s3 (i.e. For more information, see Using encryption for cross-account operations. When I re-apply the plan, the KMS encryption of the object changes to the default alias/aws/s3 key. We notice that this flag is not set for kms_key_id ( here ). Thanks to @mattburgess for the implementation. information, see PUT Bucket encryption in 2022, Amazon Web Services, Inc. or its affiliates. This doesn't change the way the objects are accessed, as long as the user has the necessary permissions . Description . If a resource is still non-compliant after auto remediation, you can set the rule to try auto remediation again. When re-applying the plan, I expect that Terraform would continue to honor the default encryption specified in the S3 bucket. Create your own custom remediation actions using, You must have AWS Config enabled in your AWS account. Javascript is disabled or is unavailable in your browser. On the next apply, since the original Terraform plan does not specify either server_side_encryption or kms_key_id, it detects a change (here). For pricing details on AWS Config rules, visit the AWS Config pricing page. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. For more information, see Using SSE-S3 in the Amazon S3 User Guide. AWS support for Internet Explorer ends on 07/31/2022. Option B is incorrect because SSE-S3 is a server-side encryption method instead of the client-side. aws_ s3_ bucket_ replication_ configuration aws_ s3_ bucket_ request_ payment_ configuration aws_ s3_ bucket_ server_ side_ encryption_ configuration aws_s3_bucket_object fails if using default server side encryption. To enable or disable server-side encryption, choose Enable or Disable. 6. The server_side_encryption_configuration argument is read-only as of version 4.0 of the Terraform AWS Provider. 4. SSE encryption of S3 using Terraform. Enable these AWS Config rules as discussed in the above two scenarios and enable auto remediation feature with existing SSM Document remediation action AWS-DisableS3BucketPublicReadWrite. For general usage questions, please see: https:/. Existing objects are not affected. Guide. Thanks for letting us know this page needs work. (Optional): While setting up remediation action, if you want to pass the resource ID of non-compliant resources to the remediation action, choose Resource ID parameter. an AWS KMS key in your AWS account the first time that you add an object encrypted To make sure your files and Amazon S3 buckets are secure, follow these best practices: Restrict access to your S3 resources: When using AWS, restrict access to your resources to the people that absolutely need it. S3 Bucket Keys can be configured through the S3 Management Console, SDK, or API. Using encryption for cross-account operations, Using Symmetric and Asymmetric Save changes From TF: To use kms key encryption for s3 bucket, use following configuration: If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. For example, there are AWS Config rules that check whether or not your Amazon S3 buckets have logging enabled or your IAM users have an MFA device enabled. Choose Edit server-side encryption. All rights reserved. Server-side encryption (SSE) encrypts an object (not the metadata) as it is written to disk (where the S3 bucket resides) and decrypts it as it is read from disk. The s3-bucket-logging-enabled AWS Config rule checks whether logging is enabled for your S3 buckets. Any objects already encrypted will stay encrypted even if we disable default bucket level encprytion. def delete_bucket_encryption (): """ This function deletes encryption policy for this bucket. If you're uploading or accessing S3 objects using AWS Identity and Access Management (IAM) principals that are in the same AWS account as your KMS key, you can use the AWS managed key (aws/s3). This service uses rules that can be configured to evaluate AWS resources against desired configurations. resource "aws_s3_bucket_logging" "example" {bucket = aws_s3_bucket.example.id target_bucket = aws_s3_bucket.log_bucket.id target_prefix = "log/"} (Account A is the principal that created the files in account B's bucket). At this point in time, the s3:PutObject will respect the configuration provided by the terraform plan and omit both the s3:x-amz-server-side-encryption and s3:x-amz-server-side-encryption-aws-kms-key-id headers (here and here). To learn more about S3 Bucket Keys visit SSE-KMS documentation. A confirmation that it executed the remediation action shows in the Action status column. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. In the Buckets list, choose the name of the bucket that you want. Monitor your S3 resources: Monitor your resources using AWS CloudTrail logs, S3 server . She is passionate about building innovative solutions using AWS services to help customers achieve their business objectives. The client doesn't directly access the encryption key or use it to encrypt and decrypt your data manually. This cause the s3:PutObject request to contain only the s3:x-amz-server-side-encryption header, but not contain the s3:x-amz-server-side-encryption-aws-kms-key-id header. 2. 5. Keys, Amazon S3 Bucket ServerSideEncryptionByDefault. Amazon offers three ways to deploy server-side encryption: Amazon S3-Managed Keys (SSE-S3) - Amazon encrypts each object with a unique 256-bit Advanced Encryption Standard (AES-256) key, then encrypts that key with a frequently rotating root key. The problem is that for whatever reason, the state that was read for server_side_encryption somehow makes it into the target configuration, whereas kms_key_id does not. <div class="navbar header-navbar"> <div class="container"> <div class="navbar-brand"> <a href="/" id="ember34" class="navbar-brand-link active ember-view"> <span id . AWS S3 also encrypts that unique key using a root or master key, adding an extra layer of . be applied. S3 bucket server-side encryption configuration can be imported in one of two ways. With S3 Bucket Keys, instead of an individual KMS key for each KMS encrypted object, a bucket-level key is generated by KMS. ubuntu@ubuntu :~$ aws s3 cp <local path> \. Use the following steps to auto-remediate an S3 bucket whose logging is not enabled: The s3-bucket-server-side-encryption-enabled AWS Config rule checks that your S3 bucket either has S3 default encryption enabled or that the S3 bucket policy explicitly denies put-object requests without server side encryption. Amazon S3 Bucket Keys are available at no additional cost in all commercial AWS Regions, including the AWS GovCloud, the AWS China (Beijing) Region, operated by Sinnet, and the AWS China (Ningxia) Region, operated by NWCD. Click here to return to Amazon Web Services homepage, Remediating Non-compliant AWS Resources by AWS Config Rules. The cp command is used to copy the data from the local system to the S3 bucket and vice versa using AWS CLI. There is no additional charge for SSE-S3, which makes it an attractive offering. Select the AWS KMS key that you want to use for folder encryption. Configure your AWS KMS key 8. You can use server-side encryption with S3-managed keys (SSE-S3) by modifying the Amazon S3 Bucket ServerSideEncryptionByDefault property to specify AES256 for SSEAlgorithm . She enjoys spending time with family and friends, playing board games and hiking. By default, AWS Config delivers configuration history and snapshot files to your S3 bucket and encrypts the data at rest using S3 AES-256 server-side encryption, SSE-S3. opts CustomResourceOptions Bag of options to control resource's behavior. are using encryption with cross-account operations, you must use a fully qualified CMK ARN. Provides a S3 bucket server-side encryption configuration resource. At this point, it calls again the resourceAwsS3BucketObjectPut (here) function to create to resource. This results in reduction of request traffic from S3 to KMS, allowing you to access encrypted objects in S3 at a fraction of the previous cost. This will remove default encryption from the S3 bucket. At this point in time, the server_side_encryption (here) and kms_key_id (here) values are persisted in the terraform.tfstate file. Please note that we try to keep the Terraform issue tracker reserved for bug reports and feature requests. As an additional safeguard, it encrypts the key itself with a key that it rotates regularly. Sign in For more details, see Remediating Non-compliant AWS Resources by AWS Config Rules. This is because KMS-encrypted objects in S3 use an individual KMS key and S3 makes a call to KMS for each read and write request to these objects. It will create an S3 bucket in the currently set default AWS region with . AWS support for Internet Explorer ends on 07/31/2022. It can also pose risks if these resources remain without remediation for an extended amount of time. This example uses encryption with AWS KMS keys (SSE-KMS). Closed . This remediation action disables an S3 buckets public Write and Read access via Block Public Access settings. Specifies whether Amazon S3 should use an S3 Bucket Key with server-side encryption using KMS (SSE-KMS) for new objects in the bucket. Server-side encryption has the following three options: Use Amazon S3-managed keys (SSE-S3) In this, the key material and the key will be provided by AWS itself to encrypt the objects in the S3 bucket. 3. The objects delivered to the S3 bucket will be encrypted using server-side encryption with KMS CMKs. I think the fix here is to set Computed: true for kms_key_id, but I am not familiar enough with Terraform to understand the other ramifications of such a change. AWS PowerShell script to create, secure and encrypt a new S3 bucket. privacy statement. You can specify the key ID or the Amazon Resource Name (ARN) of the CMK. If you do not choose a specific resource ID parameter from the drop-down list, you can enter values for each key. Properties. Creates an S3 bucket using either SSE-S3 or SSE-KMS encryption and makes the bucket non-public. All rights reserved. AWS Config rules use AWS Lambda functions to perform the compliance evaluations, and the Lambda functions return the compliance status of the evaluated resources as compliant or noncompliant. When running the initial plan, everything goes as expected and my object is created in the S3 bucket encrypted with the default KMS key specified in the bucket configuration. For more information on how to protect S3 data using encryption . With this release, if you provide AWS Config with your KMS key or alias ARN, AWS Config will use that KMS key instead of using AES-256 encryption.