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Showing content from https://docs.aws.amazon.com/AmazonS3/latest/dev/access-points-directory-buckets-policies.html below:

Configuring IAM policies for using access points for directory buckets

Access points support AWS Identity and Access Management (IAM) resource policies that allow you to control the use of the access point by resource, user, or other conditions. For an application or user to access objects through an access point, both the access point and the underlying bucket policy must permit the request.

Adding an access point to a directory bucket doesn't change the bucket's behavior when the bucket is accessed directly through the bucket's name. All existing operations against the bucket will continue to work as before. Restrictions that you include in an access point policy or access point scope apply only to requests made through that access point.

When using IAM resource policies, make sure to resolve security warnings, errors, general warnings, and suggestions from AWS Identity and Access Management Access Analyzer before you save your policy. IAM Access Analyzer runs policy checks to validate your policy against IAM policy grammar and best practices. These checks generate findings and provide recommendations to help you author policies that are functional and conform to security best practices.

To learn more about validating policies by using IAM Access Analyzer, see IAM Access Analyzer policy validation in the IAM User Guide. To view a list of the warnings, errors, and suggestions that are returned by IAM Access Analyzer, see IAM Access Analyzer policy check reference.

The following access point policies demonstrate how to control requests to a directory bucket. Access point policies require bucket ARNs or access point ARNs. Access point aliases are not supported in policies. Following is an example of an access point ARN:

  arn:aws:s3express:region:account-id:accesspoint/myaccesspoint--zoneID--xa-s3
        

You can view the access point ARN in the details of an access point. For more information, see View details for your access points for directory buckets.

Permissions granted in an access point policy are effective only if the underlying bucket also allows the same access. You can accomplish this in two ways:

1. (Recommended) Delegate access control from the bucket to the access point, as described in Delegating access control to access points.

2. Add the same permissions contained in the access point policy to the underlying bucket's policy.

The following service control policy requires all new access points are to be created with a virtual private cloud (VPC) network origin. With this policy in place, users in your organization can't create any access point that is accessible from the internet.

JSON

{
    "Version": "2012-10-17",
    "Statement": [
    {
        "Effect": "Deny",
        "Action": "s3express:CreateAccessPoint",
        "Resource": "*",
        "Condition": {
            "StringNotEquals": {
                "s3express:AccessPointNetworkOrigin": "VPC"
            }
        }
    }
  ]
}

The following access point policy limits all access to the bucket amzn-s3-demo-bucket--zoneID--x-s3 to an access point with a VPC networking origin.

JSON

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DenyCreateSessionFromNonVPC",
            "Principal": "*",
            "Action": "s3express:CreateSession",
            "Effect": "Deny",
            "Resource": "arn:aws:s3express:us-east-1:111122223333:bucket/amzn-s3-demo-bucket--usw2-az1--x-s3"
        }
    ]
}

Access points for directory buckets have condition keys that you can use in IAM policies to control access to your resources. The following condition keys represent only part of an IAM policy. For full policy examples, see Access points for directory buckets policy examples, Delegating access control to access points, and Granting permissions for cross-account access points.

s3express:DataAccessPointArn

This example shows how to filter access by the Amazon resource name (ARN) of an access point and matches all access points for AWS account 111122223333 in Region region:

"Condition" : {
    "StringLike": {
        "s3express:DataAccessPointArn": "arn:aws:s3express:region:111122223333:accesspoint/*"
    }
}

s3express:DataAccessPointAccount

This example shows a string operator that you can use to match on the account ID of the owner of an access point. The following example matches all access points that are owned by the AWS account 111122223333.

"Condition" : {
    "StringEquals": {
        "s3express:DataAccessPointAccount": "111122223333"
    }
}

s3express:AccessPointNetworkOrigin

This example shows a string operator that you can use to match on the network origin, either Internet or VPC. The following example matches only access points with a VPC origin.

"Condition" : {
    "StringEquals": {
        "s3express:AccessPointNetworkOrigin": "VPC"
    }
}

s3express:Permissions

You can use s3express:Permissions to restrict access to specific API operations in access point scope. The following API operations are supported:

• PutObject

• GetObject

• DeleteObject

• ListBucket (required for ListObjectsV2)

• GetObjectAttributes

• AbortMultipartUpload

• ListBucketMultipartUploads

• ListMultipartUploadParts

Note

When using multi-value condition keys, we recommend you use ForAllValues with Allow statements and ForAnyValue with Deny statements. For more information, see Multivalued context keys in the IAM User Guide.

For more information about using condition keys with Amazon S3, see Actions, resources, and condition keys for Amazon S3 in the Service Authorization Reference.

For more information about the required permissions to S3 API operations by S3 resource types, see Required permissions for Amazon S3 API operations.

You can delegate access control from the bucket policy to the access point policy. The following example bucket policy allows full access to all access points that are owned by the bucket owner's account. After applying the policy, all access to this bucket is controlled by access point policies. We recommend configuring your buckets this way for all use cases that don't require direct access to the bucket.

{
    "Version": "2012-10-17",
    "Statement" : [
    {
        "Effect": "Allow",
        "Principal" : { "AWS": "*" },
        "Action" : "*",
        "Resource" : [ "Bucket ARN",
        "Condition": {
            "StringEquals" : { "s3express:DataAccessPointAccount" : "Bucket owner's account ID" }
        }
    }]
}

To create an access point to a bucket that's owned by another account, you must first create the access point by specifying the bucket name and account owner ID. Then, the bucket owner must update the bucket policy to authorize requests from the access point. Creating an access point is similar to creating a DNS CNAME in that the access point doesn't provide access to the bucket contents. All bucket access is controlled by the bucket policy. The following example bucket policy allows GET and LIST requests on the bucket from an access point that's owned by a trusted AWS account.

Replace Bucket ARN with the ARN of the bucket.

JSON

{
    "Version": "2012-10-17",
    "Statement" : [
    {
        "Sid": "AllowCreateSessionForDirectoryBucket",
        "Effect": "Allow",
        "Principal" : { "AWS": "*" },
        "Action" : "s3express:CreateSession",
        "Resource" : [ "arn:aws:s3express:us-west-2:111122223333:bucket/amzn-s3-demo-bucket--usw2-az1--x-s3" ],
        "Condition": {
            "ForAllValues:StringEquals": {
                "s3express:Permissions": [
                    "GetObject",
                    "ListBucket"
                ]
            }
        }
    }]
}                
            

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