Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Examples See Also

PutBucketEncryption

This operation configures default encryption and Amazon S3 Bucket Keys for an existing bucket.

Note

Directory buckets - For directory buckets, you must make requests for this API operation to the Regional endpoint. These endpoints support path-style requests in the format https://s3express-control.region_code.amazonaws.com/bucket-name. Virtual-hosted-style requests aren't supported. For more information, see Regional and Zonal endpoints in the Amazon S3 User Guide.

By default, all buckets have a default encryption configuration that uses server-side encryption with Amazon S3 managed keys (SSE-S3).

Note

General purpose buckets
- You can optionally configure default encryption for a bucket by using server-side encryption with AWS Key Management Service (AWS KMS) keys (SSE-KMS) or dual-layer server-side encryption with AWS KMS keys (DSSE-KMS). If you specify default encryption by using SSE-KMS, you can also configure Amazon S3 Bucket Keys. For information about the bucket default encryption feature, see Amazon S3 Bucket Default Encryption in the Amazon S3 User Guide.
- If you use PutBucketEncryption to set your default bucket encryption to SSE-KMS, you should verify that your KMS key ID is correct. Amazon S3 doesn't validate the KMS key ID provided in PutBucketEncryption requests.
Directory buckets - You can optionally configure default encryption for a bucket by using server-side encryption with AWS Key Management Service (AWS KMS) keys (SSE-KMS).
- We recommend that the bucket's default encryption uses the desired encryption configuration and you don't override the bucket default encryption in your CreateSession requests or PUT object requests. Then, new objects are automatically encrypted with the desired encryption settings. For more information about the encryption overriding behaviors in directory buckets, see Specifying server-side encryption with AWS KMS for new object uploads.
- Your SSE-KMS configuration can only support 1 customer managed key per directory bucket for the lifetime of the bucket. AWS managed key (aws/s3) isn't supported.
- S3 Bucket Keys are always enabled for GET and PUT operations in a directory bucket and can’t be disabled. S3 Bucket Keys aren't supported, when you copy SSE-KMS encrypted objects from general purpose buckets to directory buckets, from directory buckets to general purpose buckets, or between directory buckets, through CopyObject, UploadPartCopy, the Copy operation in Batch Operations, or the import jobs. In this case, Amazon S3 makes a call to AWS KMS every time a copy request is made for a KMS-encrypted object.
- When you specify an AWS KMS customer managed key for encryption in your directory bucket, only use the key ID or key ARN. The key alias format of the KMS key isn't supported.
- For directory buckets, if you use PutBucketEncryption to set your default bucket encryption to SSE-KMS, Amazon S3 validates the KMS key ID provided in PutBucketEncryption requests.

Important

If you're specifying a customer managed KMS key, we recommend using a fully qualified KMS key ARN. If you use a KMS key alias instead, then AWS KMS resolves the key within the requester’s account. This behavior can result in data that's encrypted with a KMS key that belongs to the requester, and not the bucket owner.

Also, this action requires AWS Signature Version 4. For more information, see Authenticating Requests (AWS Signature Version 4).

Permissions

General purpose bucket permissions - The s3:PutEncryptionConfiguration permission is required in a policy. The bucket owner has this permission by default. The bucket owner can grant this permission to others. For more information about permissions, see Permissions Related to Bucket Operations and Managing Access Permissions to Your Amazon S3 Resources in the Amazon S3 User Guide.
Directory bucket permissions - To grant access to this API operation, you must have the s3express:PutEncryptionConfiguration permission in an IAM identity-based policy instead of a bucket policy. Cross-account access to this API operation isn't supported. This operation can only be performed by the AWS account that owns the resource. For more information about directory bucket policies and permissions, see AWS Identity and Access Management (IAM) for S3 Express One Zone in the Amazon S3 User Guide.

To set a directory bucket default encryption with SSE-KMS, you must also have the kms:GenerateDataKey and the kms:Decrypt permissions in IAM identity-based policies and AWS KMS key policies for the target AWS KMS key.

HTTP Host header syntax

Directory buckets - The HTTP Host header syntax is s3express-control.region.amazonaws.com.

The following operations are related to PutBucketEncryption:

Request Syntax


PUT /?encryption HTTP/1.1
Host: Bucket.s3.amazonaws.com
Content-MD5: ContentMD5
x-amz-sdk-checksum-algorithm: ChecksumAlgorithm
x-amz-expected-bucket-owner: ExpectedBucketOwner
<?xml version="1.0" encoding="UTF-8"?>
<ServerSideEncryptionConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
   <Rule>
      <ApplyServerSideEncryptionByDefault>
         <KMSMasterKeyID>string</KMSMasterKeyID>
         <SSEAlgorithm>string</SSEAlgorithm>
      </ApplyServerSideEncryptionByDefault>
      <BucketKeyEnabled>boolean</BucketKeyEnabled>
   </Rule>
   ...
</ServerSideEncryptionConfiguration>

URI Request Parameters

The request uses the following URI parameters.

Bucket

Specifies default encryption for a bucket using server-side encryption with different key options.

Directory buckets - When you use this operation with a directory bucket, you must use path-style requests in the format https://s3express-control.region_code.amazonaws.com/bucket-name. Virtual-hosted-style requests aren't supported. Directory bucket names must be unique in the chosen Availability Zone. Bucket names must also follow the format bucket_base_name--az_id--x-s3 (for example, DOC-EXAMPLE-BUCKET--usw2-az1--x-s3). For information about bucket naming restrictions, see Directory bucket naming rules in the Amazon S3 User Guide

Required: Yes

Content-MD5

The base64-encoded 128-bit MD5 digest of the server-side encryption configuration.

For requests made using the AWS Command Line Interface (CLI) or AWS SDKs, this field is calculated automatically.

Note

This functionality is not supported for directory buckets.

x-amz-expected-bucket-owner

The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code 403 Forbidden (access denied).

Note

For directory buckets, this header is not supported in this API operation. If you specify this header, the request fails with the HTTP status code 501 Not Implemented.

x-amz-sdk-checksum-algorithm

Indicates the algorithm used to create the checksum for the object when you use the SDK. This header will not provide any additional functionality if you don't use the SDK. When you send this header, there must be a corresponding x-amz-checksum or x-amz-trailer header sent. Otherwise, Amazon S3 fails the request with the HTTP status code 400 Bad Request. For more information, see Checking object integrity in the Amazon S3 User Guide.

If you provide an individual checksum, Amazon S3 ignores any provided ChecksumAlgorithm parameter.

Note

For directory buckets, when you use AWS SDKs, CRC32 is the default checksum algorithm that's used for performance.

Valid Values: CRC32 | CRC32C | SHA1 | SHA256

Request Body

The request accepts the following data in XML format.

ServerSideEncryptionConfiguration

Root level tag for the ServerSideEncryptionConfiguration parameters.

Required: Yes

Rule

Container for information about a particular server-side encryption configuration rule.

Type: Array of ServerSideEncryptionRule data types

Required: Yes

Response Syntax


HTTP/1.1 200

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Examples

In the request, you specify the encryption configuration in the request body. The encryption configuration is specified as XML, as shown in the following examples that show setting encryption using SSE-S3, SSE-KMS, or DSSE-KMS.

Request Body for Setting SSE-S3 for general purpose buckets

This example illustrates one usage of PutBucketEncryption.



           <ServerSideEncryptionConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
               <Rule>
                  <ApplyServerSideEncryptionByDefault>
                     <SSEAlgorithm>AES256</SSEAlgorithm>
                  </ApplyServerSideEncryptionByDefault>
               </Rule>
            </ServerSideEncryptionConfiguration>

Request Body for Setting SSE-KMS for general purpose buckets

This example illustrates one usage of PutBucketEncryption.



           <ServerSideEncryptionConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
               <Rule>
                  <ApplyServerSideEncryptionByDefault>
                      <SSEAlgorithm>aws:kms:dsse</SSEAlgorithm>
                      <KMSKeyID>arn:aws:kms:us-east-1:1234/5678example</KMSKeyID>
                  </ApplyServerSideEncryptionByDefault>
               </Rule>
            </ServerSideEncryptionConfiguration>

Set the Default Encryption Configuration for an S3 general purpose bucket

The following is an example of a PUT /? encryption request that specifies to use SSE-KMS encryption.


PUT /?encryption HTTP/1.1
Host: examplebucket.<Region>s3.amazonaws.com
Date: Wed, 06 Sep 2017 12:00:00 GMT
Authorization: authorization 
Content-Length: length

<ServerSideEncryptionConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
  <Rule>
    <ApplyServerSideEncryptionByDefault>
        <SSEAlgorithm>aws:kms</SSEAlgorithm>
        <KMSKeyID>arn:aws:kms:us-east-1:1234/5678example</KMSKeyID>
    </ApplyServerSideEncryptionByDefault>
</Rule>
</ServerSideEncryptionConfiguration>