Amazon S3 Specific One Zone now helps AWS KMS with buyer managed keys

Amazon S3 Specific One Zone, a high-performance, single-Availability Zone (AZ) S3 storage class, now helps server-side encryption with AWS Key Administration Service (KMS) keys (SSE-KMS). S3 Specific One Zone already encrypts all objects saved in S3 listing buckets with Amazon S3 managed keys (SSE-S3) by default. Beginning immediately, you need to use AWS KMS buyer managed keys to encrypt knowledge at relaxation, with no impression on efficiency. This new encryption functionality offers you an extra choice to fulfill compliance and regulatory necessities when utilizing S3 Specific One Zone, which is designed to ship constant single-digit millisecond knowledge entry on your most often accessed knowledge and latency-sensitive functions.

S3 listing buckets permit you to specify just one buyer managed key per bucket for SSE-KMS encryption. As soon as the client managed secret’s added, you can not edit it to make use of a brand new key. Alternatively, with S3 common goal buckets, you need to use a number of KMS keys both by altering the default encryption configuration of the bucket or throughout S3 PUT requests. When utilizing SSE-KMS with S3 Specific One Zone, S3 Bucket Keys are all the time enabled. S3 Bucket Keys are free and scale back the variety of requests to AWS KMS by as much as 99%, optimizing each efficiency and prices.

Utilizing SSE-KMS with Amazon S3 Specific One Zone
To point out you this new functionality in motion, I first create an S3 listing bucket within the Amazon S3 console following the steps to create a S3 listing bucket and use apne1-az4 because the Availability Zone. In Base identify, I enter s3express-kms and a suffix that features the Availability Zone ID wich is robotically added to create the ultimate identify. Then, I choose the checkbox to acknowledge that Information is saved in a single Availability Zone.

Within the Default encryption part, I select Server-side encryption with AWS Key Administration Service keys (SSE-KMS). Beneath AWS KMS Key I can Select out of your AWS KMS keys, Enter AWS KMS key ARN, or Create a KMS key. For this instance, I beforehand created an AWS KMS key, which I chosen from the listing, after which select Create bucket.

Now, any new object I add to this S3 listing bucket shall be robotically encrypted utilizing my AWS KMS key.

SSE-KMS with Amazon S3 Specific One Zone in motion
To make use of SSE-KMS with S3 Specific One Zone by way of the AWS Command Line Interface (AWS CLI), you want an AWS Id and Entry Administration (IAM) person or function with the next coverage . This coverage permits the CreateSession API operation, which is critical to efficiently add and obtain encrypted recordsdata to and out of your S3 listing bucket.

{
	"Model": "2012-10-17",
	"Assertion": [
		{
			"Effect": "Allow",
			"Action": [
				"s3express:CreateSession"
			],
			"Useful resource": [
				"arn:aws:s3express:*:<account>:bucket/s3express-kms--apne1-az4--x-s3"
			]
		},
		{
			"Impact": "Enable",
			"Motion": [
				"kms:Decrypt",
				"kms:GenerateDataKey"
			],
			"Useful resource": [
				"arn:aws:kms:*:<account>:key/<keyId>"
			]
		}
	]
}

With the PutObject command, I add a brand new file named confidential-doc.txt to my S3 listing bucket.

aws s3api put-object --bucket s3express-kms--apne1-az4--x-s3 
--key confidential-doc.txt 
--body confidential-doc.txt

As successful of the earlier command I obtain the next output:

{
    "ETag": ""664469eeb92c4218bbdcf92ca559d03b"",
    "ChecksumCRC32": "0duteA==",
    "ServerSideEncryption": "aws:kms",
    "SSEKMSKeyId": "arn:aws:kms:ap-northeast-1:<accountId>:key/<keyId>",
    "BucketKeyEnabled": true
}

Checking the thing’s properties with HeadObject command, I see that it’s encrypted utilizing SSE-KMS with the important thing that I created earlier than:

aws s3api head-object --bucket s3express-kms--apne1-az4--x-s3 
--key confidential-doc.txt

I get the next output:

 
{
    "AcceptRanges": "bytes",
    "LastModified": "2024-08-21T15:29:22+00:00",
    "ContentLength": 5,
    "ETag": ""664469eeb92c4218bbdcf92ca559d03b"",
    "ContentType": "binary/octet-stream",
    "ServerSideEncryption": "aws:kms",
    "Metadata": {},
    "SSEKMSKeyId": "arn:aws:kms:ap-northeast-1:<accountId>:key/<keyId>",
    "BucketKeyEnabled": true,
    "StorageClass": "EXPRESS_ONEZONE"
}

I obtain the encrypted object with GetObject:

aws s3api get-object --bucket s3express-kms--apne1-az4--x-s3 
--key confidential-doc.txt output-confidential-doc.txt

As my session has the mandatory permissions, the thing is downloaded and decrypted robotically.

{
    "AcceptRanges": "bytes",
    "LastModified": "2024-08-21T15:29:22+00:00",
    "ContentLength": 5,
    "ETag": ""664469eeb92c4218bbdcf92ca559d03b"",
    "ContentType": "binary/octet-stream",
    "ServerSideEncryption": "aws:kms",
    "Metadata": {},
    "SSEKMSKeyId": "arn:aws:kms:ap-northeast-1:<accountId>:key/<keyId>",
    "BucketKeyEnabled": true,
    "StorageClass": "EXPRESS_ONEZONE"
}

For this second take a look at, I exploit a special IAM person with a coverage that’s not granted the mandatory KMS key permissions to obtain the thing. This try fails with an AccessDenied error, demonstrating that the SSE-KMS encryption is functioning as meant.

An error occurred (AccessDenied) when calling the CreateSession operation: Entry Denied

This demonstration exhibits how SSE-KMS works seamlessly with S3 Specific One Zone, offering an extra layer of safety whereas sustaining ease of use for approved customers.

Issues to know
Getting began – You may allow SSE-KMS for S3 Specific One Zone utilizing the Amazon S3 console, AWS CLI, or AWS SDKs. Set the default encryption configuration of your S3 listing bucket to SSE-KMS and specify your AWS KMS key. Keep in mind, you’ll be able to solely use one buyer managed key per S3 listing bucket for its lifetime.

Areas – S3 Specific One Zone assist for SSE-KMS utilizing buyer managed keys is on the market in all AWS Areas the place S3 Specific One Zone is at present accessible.

Efficiency – Utilizing SSE-KMS with S3 Specific One Zone doesn’t impression request latency. You’ll proceed to expertise the identical single-digit millisecond knowledge entry.

Pricing – You pay AWS KMS expenses to generate and retrieve knowledge keys used for encryption and decryption. Go to the AWS KMS pricing web page for extra particulars. As well as, when utilizing SSE-KMS with S3 Specific One Zone, S3 Bucket Keys are enabled by default for all knowledge aircraft operations aside from CopyObject and UploadPartCopy, and may’t be disabled. This reduces the variety of requests to AWS KMS by as much as 99%, optimizing each efficiency and prices.

AWS CloudTrail integration – You may audit SSE-KMS actions on S3 Specific One Zone objects utilizing AWS CloudTrail. Be taught extra about that in my earlier weblog submit.

– Eli.