other configuration .} Make sure 'Server-side encryption' is set to 'Enable' 6. From the top menu, select the Properties tab and scroll down to the Default encryption section. Existing objects are not affected. information, see Using Symmetric and Asymmetric Provides a S3 bucket server-side encryption configuration resource. 1. 4. Already on GitHub? ubuntu@ubuntu :~$ aws s3 cp <local path> \. This has been released in version 3.10.0 of the Terraform AWS provider. We notice that this flag is not set for kms_key_id (here). 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. When you copy files from one S3 bucket in account A using credentials of account A to a bucket in account B, the owner of the files in the destination bucket will be account A. It can also be used to copy the data from one source S3 bucket to another destination S3 bucket. This parameter is allowed if SSEAlgorithm is Click the linked S3 bucket name you intend to check its configuration ( Similarly to what we did in the Audit section). 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. For more For more information, see Using encryption for cross-account operations. resource "aws_s3_bucket_logging" "example" {bucket = aws_s3_bucket.example.id target_bucket = aws_s3_bucket.log_bucket.id target_prefix = "log/"} To enable or disable server-side encryption, choose Enable or Disable. with SSE-KMS to a bucket. AES256 for SSEAlgorithm. https . You can then provide the KMS key to AWS Config by calling the PutDeliveryChannel API with your S3 KMS key, ARN, or alias ARN. . Amazon S3 server-side encryption uses one of the strongest block ciphers available to encrypt your data, 256-bit Advanced Encryption Standard (AES-256). 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. This doesn't change the way the objects are accessed, as long as the user has the necessary permissions . Guide. Use server-side encryption so that Amazon S3 manages encryption and decryption for you. She is passionate about building innovative solutions using AWS services to help customers achieve their business objectives. are using encryption with cross-account operations, you must use a fully qualified CMK ARN. to your account. It can also evaluate those AWS resources for compliance. You can associate remediation actions with AWS Config rules and choose to execute them automatically to address non-compliant resources without manual intervention. 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). :return: None """ s3_client . You can specify the key ID or the Amazon Resource Name (ARN) of the CMK. Select Enable for Enabling Server-side encryption. 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. Set 'Encryption key type' to 'AWS Key Management Service key' 7. 3. 5. 2022, Amazon Web Services, Inc. or its affiliates. The AWS Config Auto Remediation feature automatically remediates non-compliant resources evaluated by AWS Config rules. This remediation action disables an S3 buckets public Write and Read access via Block Public Access settings. She enjoys spending time with family and friends, playing board games and hiking. Choose Properties. 2. (Account A is the principal that created the files in account B's bucket). It will create an S3 bucket in the currently set default AWS region with . You signed in with another tab or window. For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Disabling server-side encryption of S3 buckets is security-sensitive. Dynamic block in S3 resource fails on: Too many server_side_encryption_configuration blocks #9564. If you've got a moment, please tell us how we can make the documentation better. Supported browsers are Chrome, Firefox, Edge, and Safari. At this point in time, the server_side_encryption (here) and kms_key_id (here) values are persisted in the terraform.tfstate file. When I re-apply the plan, the KMS encryption of the object changes to the default alias/aws/s3 key. Amazon S3 only supports symmetric KMS keys and not asymmetric KMS keys. By default, Amazon S3 uses this KMS key for SSE-KMS. For more information about AWS Config, see the AWS Config webpage. You will also have the option to override the S3 Bucket Key configuration for specific objects in a bucket with an individual per-object KMS key using the API and SDK. Navigate to S3. Describes the default server-side encryption to apply to new objects in the bucket. Please note that we try to keep the Terraform issue tracker reserved for bug reports and feature requests. 4. From among the many encryption and security options for S3 buckets, this script has an opinionated function. To enable server-side encryption using an Amazon S3-managed key, under Encryption key type, choose Amazon S3 key (SSE-S3). 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 . As an additional safeguard, it encrypts the key itself with a key that it rotates regularly. With S3 Bucket Keys, instead of an individual KMS key for each KMS encrypted object, a bucket-level key is generated by KMS. You can use Create a new bucket. 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. Please refer to your browser's Help pages for instructions. Option B is incorrect because SSE-S3 is a server-side encryption method instead of the client-side. Using ACL policy grants. S3 Bucket Keys can be configured through the S3 Management Console, SDK, or API. I've pushed a better fix for it at #15234 so hopefully that gets a bit of traction soon. In this post, you saw how to auto-remediate non-compliant S3 resources using the AWS Config auto remediation feature for AWS Config rules. Any objects already encrypted will stay encrypted even if we disable default bucket level encprytion. An AWS S3 bucket can be protected from public read and write using AWS Config rules s3-bucket-public-read-prohibited and s3-bucket-public-write-prohibited respectively. If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Successfully merging a pull request may close this issue. This is not always feasible if you have many noncompliant resources for which you want to execute remediation actions. Supported browsers are Chrome, Firefox, Edge, and Safari. Follow the principle of least privilege. Using AWS Console. Hi there, Thank you for opening an issue. S3 uses this bucket key to create unique data keys for objects in a bucket, avoiding the need for additional KMS requests to complete encryption operations. The "s3-bucket-server-side-encryption-enabled" AWS Config rule can now auto-remediate non-compliant resources. def delete_bucket_encryption (): """ This function deletes encryption policy for this bucket. To get started, create a KMS key and configure it with the permission to GenerateDataKey and Decrypt. From the AWS console homepage, search for S3 in the services search bar, and click on the S3 service in the search results. Harshitha Putta is an Associate Consultant with AWS Professional Services in Seattle, WA. When re-applying the plan, I expect that Terraform would continue to honor the default encryption specified in the S3 bucket. With a few clicks in AWS Management Console and no changes to your client applications, you can configure your buckets to use an S3 Bucket Key for KMS-based encryption on new objects. If selected, at runtime that parameter is substituted with the ID of the resource to be remediated. After fiddling around, I think that this is caused by the Computed flag ( here) for server_side_encryption. 2022, Amazon Web Services, Inc. or its affiliates. an AWS KMS key in your AWS account the first time that you add an object encrypted Until now, remediation actions had to be executed manually for each noncompliant resource. If you've got a moment, please tell us what we did right so we can do more of it. 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. Because the initial call is creating a new resource, the Create function gets called in the resource. The text was updated successfully, but these errors were encountered: Looks like this is a duplicate of #10200. 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. 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. This ultimately causes AWS to use the default alias/aws/s3 to encrypt the file, instead of the one specified by the default server side configuration on the S3 bucket. In this mode of SSE, AWS S3 manages and handles the encryption keys. All rights reserved. Objects can be encrypted with S3 Managed Keys (SSE-S3), KMS Managed Keys (SSE-KMS), or Customer Provided Keys (SSE-C). 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. If you choose a resource ID parameter from the drop-down list, you can enter values for all the other keys except the selected resource ID parameter. To declare this entity in your AWS CloudFormation template, use the following syntax: KMS key ID to use for the default encryption. This change only affects new objects uploaded to that bucket. See the aws_s3_bucket_server_side_encryption_configuration resource for configuration details. aws_s3_bucket resources/data sources Reference: #9564. bflad . 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. Make sure you have the following prerequisites before following the solution in this post: Use the following steps to set up Auto Remediation for each of the four AWS Config rules. The client doesn't directly access the encryption key or use it to encrypt and decrypt your data manually. 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. After the initial creation, the Read function is called in the resource to read the resource state. There is no additional charge for SSE-S3, which makes it an attractive offering. Sign in Default encryption for a bucket can use server-side encryption with Amazon S3-managed keys (SSE-S3) or customer managed keys (SSE-KMS). Workloads that access millions or billions of objects encrypted with SSE-KMS can generate large request volumes to KMS. Support for KMS encryption on S3 buckets used by AWS Config is available at no additional cost in all commercial AWS Regions and AWS GovCloud (US). To require that a particular AWS KMS key be used to encrypt the objects in a bucket, you can use the s3:x-amz-server-side-encryption-aws-kms-key-id condition key. resource "aws_s3_bucket" "log_bucket" {bucket = "example-log-bucket" # . If you do not choose a specific resource ID parameter from the drop-down list, you can enter values for each key. The server_side_encryption_configuration argument is read-only as of version 4.0 of the Terraform AWS Provider. 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. Amazon S3 Bucket Keys reduce the request costs of Amazon S3 server-side encryption (SSE) with AWS Key Management Service (KMS) by up to 99% by decreasing the request traffic from S3 to KMS. S3 bucket server-side encryption is now enabled automatically using the AWS Config Auto Remediation feature. Thanks for letting us know this page needs work. For more information on how to create and configure AWS Key Management Service (AWS KMS), see the AWS Key Management Service Documentation. If you don't specify a customer managed key at configuration, Amazon S3 automatically creates For more information, see. The AWS managed key (aws/s3) is used when a AWS KMS key Amazon Resource Name (ARN) or alias is not provided at request time, nor via the bucket's default encryption configuration. args BucketServerSideEncryptionConfigurationV2Args The arguments to resource properties. Create your own custom remediation actions using, You must have AWS Config enabled in your AWS account. Click here to return to Amazon Web Services homepage, Amazon S3 Bucket Keys reduce the costs of Server-Side Encryption with AWS Key Management Service (SSE-KMS). Creates an S3 bucket using either SSE-S3 or SSE-KMS encryption and makes the bucket non-public. Closed . 7. This example uses encryption with AWS KMS keys (SSE-KMS). If you do not provide AWS Config with a KMS key or alias ARN, then AWS Config will default to encrypting the delivered data with AES-256 encryption. SSE encryption of S3 using Terraform. Thanks for letting us know we're doing a good job! The following example creates a bucket with server-side bucket encryption configured. After fiddling around, I think that this is caused by the Computed flag (here) for server_side_encryption. Well occasionally send you account related emails. There are no additional fees for using server-side encryption with Amazon S3-managed keys (SSE-S3). All rights reserved. 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. AWS Config now supports the ability to use an AWS Key Management Service (KMS) key or alias Amazon Resource Name (ARN) that you provide, to encrypt the data delivered to your Amazon Simple Storage Service (S3) bucket. This will remove default encryption from the S3 bucket. Choose Edit server-side encryption. information, see PUT Bucket encryption in Log in to the Management Console and access the S3 dashboard. If a resource is still non-compliant after auto remediation, you can set the rule to try auto remediation again. 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. Select the AWS KMS key that you want to use for folder encryption. I want to create a S3 and make it encryption at rest with AES256, but terraform complain that: * aws_s3_bucket.s3: : invalid or unknown key: server_side_encryption_configuration (see my code complained by terraform below) What is wrong with server_side_encryption_configuration? 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). privacy statement. With a few clicks in AWS Management Console and no changes to your client applications, you can configure your buckets to use an S3 Bucket Key for KMS-based encryption on new objects. With Auto Remediation feature of AWS Config rules, the remediation action can be executed automatically when a resource is found non-compliant. PUT Object request doesn't specify any server-side encryption, this default encryption will I'm going to lock this issue because it has been closed for 30 days . Each parameter has either a static value or a dynamic value. This example uses encryption with AWS KMS keys (SSE-KMS). AWS Config keeps track of the configuration of your AWS resources and their relationships to your other resources. While I do not have intimate knowledge of what the computed flag does, I believe it signals to Terraform that this property should use the value from the state in preference to a value provided by the Terraform plan itself. If a other configuration .} 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. AWS support for Internet Explorer ends on 07/31/2022. 6. At this point, it calls again the resourceAwsS3BucketObjectPut (here) function to create to resource. Example Usage Create a BucketServerSideEncryptionConfigurationV2 Resource name string The unique name of the resource. Keys, Amazon S3 Bucket ServerSideEncryptionByDefault. aws:kms. In this post, you learn how to use the new AWS Config Auto Remediation feature on a noncompliant S3 bucket to ensure it is remediated automatically. Too many server_side_encryption_configuration blocks on line 0: (source code not available) No more than 1 "server_side_encryption_configuration" blocks are allowed . 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. S3 bucket server-side encryption configuration can be imported in one of two ways. To use the Amazon Web Services Documentation, Javascript must be enabled. This post describes how to use the AWS Config Auto Remediation feature to auto remediate any non-compliant S3 buckets using the following AWS Config rules: These AWS Config rules act as controls to prevent any non-compliant S3 activities. This service uses rules that can be configured to evaluate AWS resources against desired configurations. This occurs because the s3:x-amz-server-side-encryption header is set to aws:kms, but the s3:x-amz-server-side-encryption-aws-kms-key-id is omitted on subsequent calls to the s3:PutObject API. The objects delivered to the S3 bucket will be encrypted using server-side encryption with KMS CMKs. Amazon S3 Bucket Keys reduce the request costs of Amazon S3 server-side encryption (SSE) with AWS Key Management Service (KMS) by up to 99% by decreasing the request traffic from S3 to KMS. Option C is incorrect because server-side encryption does not help with the encryption in transit. If the owner (account ID) of the source bucket is the same account used to configure the Terraform AWS Provider, the S3 server-side encryption configuration resource should be imported using the bucket e.g., $ terraform import aws_s3_bucket_server_side_encryption_configuration.example bucket-name. put-bucket-encryption Description This action uses the encryptionsubresource to configure default encryption and Amazon S3 Bucket Key for an existing bucket. All rights reserved. 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). 2. Click here to return to Amazon Web Services homepage, Remediating Non-compliant AWS Resources by AWS Config Rules. Description . Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. aws_s3_bucket_object fails if using default server side encryption. aws_ s3_ bucket_ replication_ configuration aws_ s3_ bucket_ request_ payment_ configuration aws_ s3_ bucket_ server_ side_ encryption_ configuration The fix for this has been merged and will release with version 3.10.0 of the Terraform AWS Provider, later this week. However, if you resource "aws_s3_bucket" "example" {bucket = "yournamehere" # . isn't it supported? Thanks! opts CustomResourceOptions Bag of options to control resource's behavior. It uses a unique key to encrypt each object on the server side using AES-256.