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CloudFront provides two ways to send authenticated requests to an Amazon S3 origin: origin access control (OAC) and origin access identity (OAI). OAC helps you secure your origins, such as for Amazon S3. We recommend using OAC because it supports:

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Origin access identity (OAI) doesn't work for the scenarios in the preceding list, or it requires extra workarounds in those scenarios. The following topics describe how to use origin access control (OAC) with an Amazon S3 origin. For information about how to migrate from origin access identity (OAI) to origin access control (OAC), see Migrating from origin access identity (OAI) to origin access control (OAC).

When you use CloudFront OAC with Amazon S3 bucket origins, you must set Amazon S3 Object Ownership to Bucket owner enforced, the default for new Amazon S3 buckets. If you require ACLs, use the Bucket owner preferred setting to maintain control over objects uploaded via CloudFront.

If your origin is an Amazon S3 bucket configured as a website endpoint, you must set it up with CloudFront as a custom origin. That means you can't use OAC (or OAI). OAC doesn't support origin redirect by using Lambda@Edge.

Before you create and set up origin access control (OAC), you must have a CloudFront distribution with an Amazon S3 bucket origin. This origin must be a regular S3 bucket, not a bucket configured as a website endpoint. For more information about setting up a CloudFront distribution with an S3 bucket origin, see Get started with a basic CloudFrontdistribution.

Before you create an origin access control (OAC) or set it up in a CloudFront distribution, make sure the OAC has permission to access the S3 bucket origin. Do this after creating a CloudFront distribution, but before adding the OAC to the S3 origin in the distribution configuration.

To give the OAC permission to access the S3 bucket, use an S3 bucket policy to allow the CloudFront service principal (cloudfront.amazonaws.com) to access the bucket. Use a Condition element in the policy to allow CloudFront to access the bucket only when the request is on behalf of the CloudFront distribution that contains the S3 origin.

If the objects in the S3 bucket origin are encrypted using server-side encryption with AWS Key Management Service (SSE-KMS), you must make sure that the OAC has permission to use the AWS KMS key. To give the OAC permission to use the KMS key, add a statement to the KMS key policy. For information about how to modify a key policy, see Changing a key policy in the AWS Key Management Service Developer Guide.

To create an origin access control (OAC) with AWS CloudFormation, use the AWS::CloudFront::OriginAccessControl resource type. The following example shows the AWS CloudFormation template syntax, in YAML format, for creating an origin access control.

To create an origin access control with the AWS Command Line Interface (AWS CLI), use the aws cloudfront create-origin-access-control command. You can use an input file to provide the input parameters for the command, rather than specifying each individual parameter as command line input.

To create an origin access control with the CloudFront API, use CreateOriginAccessControl. For more information about the fields that you specify in this API call, see the API reference documentation for your AWS SDK or other API client.

For both of these API calls, provide the origin access control ID in the OriginAccessControlId field, inside an origin. For more information about the other fields that you specify in these API calls, see Distribution settings reference and the API reference documentation for your AWS SDK or other API client.

If you need to delete a distribution with an OAC attached to an S3 bucket, you should delete the distribution before you delete the S3 bucket origin. Alternatively, include the Region in the origin domain name. If this isn't possible, you can remove the OAC from the distribution by switching to public before deletion. For more information, see Delete a distribution.

To migrate from a legacy origin access identity (OAI) to an origin access control (OAC), first update the S3 bucket origin to allow both the OAI and OAC to access the bucket's content. This makes sure that CloudFront never loses access to the bucket during the transition. To allow both OAI and OAC to access an S3 bucket, update the bucket policy to include two statements, one for each kind of principal.

After you update the S3 origin's bucket policy to allow access to both OAI and OAC, you can update the distribution configuration to use OAC instead of OAI. For more information, see Creating a new origin access control.

After the distribution is fully deployed, you can remove the statement in the bucket policy that allows access to the OAI. For more information, see Giving the origin access control permission to access the S3 bucket.

The CloudFront origin access control feature includes advanced settings that are intended only for specific use cases. Use the recommended settings unless you have a specific need for the advanced settings.

We recommend using this setting, named Sign requests (recommended) in the console, or always in the API, CLI, and AWS CloudFormation. With this setting, CloudFront always signs all requests that it sends to the S3 bucket origin.

This setting is named Do not sign requests in the console, or never in the API, CLI, and AWS CloudFormation. Use this setting to turn off origin access control for all origins in all distributions that use this origin access control. This can save time and effort compared to removing an origin access control from all origins and distributions that use it, one by one. With this setting, CloudFront does not sign any requests that it sends to the S3 bucket origin.

To use this setting, the S3 bucket origin must be publicly accessible. If you use this setting with an S3 bucket origin that's not publicly accessible, CloudFront cannot access the origin. The S3 bucket origin returns errors to CloudFront and CloudFront passes those errors on to viewers.

This setting is named Do not override authorization header in the console, or no-override in the API, CLI, and AWS CloudFormation. Use this setting when you want CloudFront to sign origin requests only when the corresponding viewer request does not include an Authorization header. With this setting, CloudFront passes on the Authorization header from the viewer request when one is present, but signs the origin request (adding its own Authorization header) when the viewer request doesn't include an Authorization header.

To pass along the Authorization header from the viewer request, you must add the Authorization header to a cache policy for all cache behaviors that use S3 bucket origins associated with this origin access control.

CloudFront origin access identity (OAI) provides similar functionality as origin access control (OAC), but it doesn't work for all scenarios. This is why we recommend using OAC instead. Specifically, OAI doesn't support:

When you create an OAI or add one to a distribution with the CloudFront console, you can automatically update the Amazon S3 bucket policy to give the OAI permission to access your bucket. Alternatively, you can choose to manually create or update the bucket policy. Whichever method you use, you should still review the permissions to make sure that:

If you configure CloudFront to accept and forward all of the HTTP methods that CloudFront supports, make sure you give your CloudFront OAI the desired permissions. For example, if you configure CloudFront to accept and forward requests that use the DELETE method, configure your bucket policy to handle DELETE requests appropriately so viewers can delete only files that you want them to.

Using the CloudFront console. When you add an OAI to your origin settings in the CloudFront console, you can choose Yes, update the bucket policy to tell CloudFront to update the bucket policy on your behalf.

To give the OAI the permissions to access objects in your Amazon S3 bucket, use actions in the policy that relate to specific Amazon S3 API operations. For example, the s3:GetObject action allows the OAI to read objects in the bucket. For more information, see the examples in the following section, or see Amazon S3 actions in the Amazon Simple Storage Service User Guide.

The following example allows the OAI to read and write objects in the specified bucket (s3:GetObject and s3:PutObject). This allows viewers to upload files to your Amazon S3 bucket through CloudFront.

Amazon S3 recommends setting S3 Object Ownership to bucket owner enforced, which means that ACLs are disabled for the bucket and the objects in it. When you apply this setting for Object Ownership, you must use bucket policies to give access to the OAI (see the previous section).

When you grant access to an OAI using an ACL, you must specify the OAI using its Amazon S3 canonical user ID. In the CloudFront console, you can find this ID under Security, Origin access, Identities (legacy). If you're using the CloudFront API, use the value of the S3CanonicalUserId element that was returned when you created the OAI, or call ListCloudFrontOriginAccessIdentities in the CloudFront API.

Newer Amazon S3 Regions require that you use Signature Version 4 for authenticated requests. (For the signature versions supported in each Amazon S3 Region, see Amazon Simple Storage Service endpoints and quotas in the AWS General Reference.) If you're using an origin access identity and if your bucket is in one of the Regions that requires Signature Version 4, note the following:

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The git submodule update command actually tells Git that you want your submodules to each check out the commit already specified in the index of the superproject. If you want to update your submodules to the latest commit available from their remote, you will need to do this directly in the submodules.