AmazonS3Client.PutACL Method (PutACLRequest)

End of support notice: As of October 1, 2025, Amazon S3 has discontinued support for Email Grantee Access Control Lists (ACLs). If you attempt to use an Email Grantee ACL in a request after October 1, 2025, the request will receive an HTTP 405 (Method Not Allowed) error.

This change affects the following Amazon Web Services Regions: US East (N. Virginia), US West (N. California), US West (Oregon), Asia Pacific (Singapore), Asia Pacific (Sydney), Asia Pacific (Tokyo), Europe (Ireland), and South America (São Paulo).

This operation is not supported for directory buckets.

Sets the permissions on an existing bucket using access control lists (ACL). For more information, see Using ACLs. To set the ACL of a bucket, you must have the WRITE_ACP permission.

You can use one of the following two ways to set a bucket's permissions:

Specify the ACL in the request body
Specify permissions using request headers

You cannot specify access permission using both the body and the request headers.

Depending on your application needs, you may choose to set the ACL on a bucket using either the request body or the headers. For example, if you have an existing application that updates a bucket ACL using the request body, then you can continue to use that approach.

If your bucket uses the bucket owner enforced setting for S3 Object Ownership, ACLs are disabled and no longer affect permissions. You must use policies to grant access to your bucket and the objects in it. Requests to set ACLs or update ACLs fail and return the AccessControlListNotSupported error code. Requests to read ACLs are still supported. For more information, see Controlling object ownership in the Amazon S3 User Guide.

Permissions

You can set access permissions by using one of the following methods:

Specify a canned ACL with the x-amz-acl request header. Amazon S3 supports a set of predefined ACLs, known as canned ACLs. Each canned ACL has a predefined set of grantees and permissions. Specify the canned ACL name as the value of x-amz-acl. If you use this header, you cannot use other access control-specific headers in your request. For more information, see Canned ACL.
Specify access permissions explicitly with the x-amz-grant-read, x-amz-grant-read-acp, x-amz-grant-write-acp, and x-amz-grant-full-control headers. When using these headers, you specify explicit access permissions and grantees (Amazon Web Services accounts or Amazon S3 groups) who will receive the permission. If you use these ACL-specific headers, you cannot use the x-amz-acl header to set a canned ACL. These parameters map to the set of permissions that Amazon S3 supports in an ACL. For more information, see Access Control List (ACL) Overview.
You specify each grantee as a type=value pair, where the type is one of the following:
- id – if the value specified is the canonical user ID of an Amazon Web Services account
- uri – if you are granting permissions to a predefined group
- emailAddress – if the value specified is the email address of an Amazon Web Services account
  Using email addresses to specify a grantee is only supported in the following Amazon Web Services Regions:
  - US East (N. Virginia)
  - US West (N. California)
  - US West (Oregon)
  - Asia Pacific (Singapore)
  - Asia Pacific (Sydney)
  - Asia Pacific (Tokyo)
  - Europe (Ireland)
  - South America (São Paulo)
  For a list of all the Amazon S3 supported Regions and endpoints, see Regions and Endpoints in the Amazon Web Services General Reference.
For example, the following x-amz-grant-write header grants create, overwrite, and delete objects permission to LogDelivery group predefined by Amazon S3 and two Amazon Web Services accounts identified by their email addresses.
x-amz-grant-write: uri="http://acs.amazonaws.com/groups/s3/LogDelivery", id="111122223333", id="555566667777"

You can use either a canned ACL or specify access permissions explicitly. You cannot do both.

Grantee Values

You can specify the person (grantee) to whom you're assigning access rights (using request elements) in the following ways. For examples of how to specify these grantee values in JSON format, see the Amazon Web Services CLI example in Enabling Amazon S3 server access logging in the Amazon S3 User Guide.

By the person's ID:
<>ID<><>GranteesEmail<>
DisplayName is optional and ignored in the request
By URI:
<>http://acs.amazonaws.com/groups/global/AuthenticatedUsers<>
By Email address:
<>Grantees@email.com<>&
The grantee is resolved to the CanonicalUser and, in a response to a GET Object acl request, appears as the CanonicalUser.
Using email addresses to specify a grantee is only supported in the following Amazon Web Services Regions:
- US East (N. Virginia)
- US West (N. California)
- US West (Oregon)
- Asia Pacific (Singapore)
- Asia Pacific (Sydney)
- Asia Pacific (Tokyo)
- Europe (Ireland)
- South America (São Paulo)
For a list of all the Amazon S3 supported Regions and endpoints, see Regions and Endpoints in the Amazon Web Services General Reference.

The following operations are related to PutBucketAcl:

You must URL encode any signed header values that contain spaces. For example, if your header value is my file.txt, containing two spaces after my, you must URL encode this value to my%20%20file.txt.

Note:

For .NET Core this operation is only available in asynchronous form. Please refer to PutACLAsync.

Namespace: Amazon.S3
Assembly: AWSSDK.S3.dll
Version: 3.x.y.z

Syntax

public virtual PutACLResponse PutACL(
         PutACLRequest request
)

Parameters

request: Type: Amazon.S3.Model.PutACLRequest

Container for the necessary parameters to execute the PutACL service method.

Return Value

Type: PutACLResponse

The response from the PutACL service method, as returned by S3.

Examples

This example shows how to set a canned ACL on an object, first to PublicRead, then back to Private.

PutACL sample 1


// Create a client
AmazonS3Client client = new AmazonS3Client();

// Set Canned ACL (PublicRead) for an existing item
client.PutACL(new PutACLRequest
{
    BucketName = "amzn-s3-demo-bucket",
    Key = "Item1",
    CannedACL = S3CannedACL.PublicRead
});

// Set Canned ACL (PublicRead) for an existing item
// (This reverts ACL back to default for object)
client.PutACL(new PutACLRequest
{
    BucketName = "amzn-s3-demo-bucket",
    Key = "Item1",
    CannedACL = S3CannedACL.Private
});

This example shows how to get and set ACLs on an object.

GetACL\PutACL samples


// Create a client
AmazonS3Client client = new AmazonS3Client();

// Retrieve ACL for object
S3AccessControlList acl = client.GetACL(new GetACLRequest
{
    BucketName = "amzn-s3-demo-bucket",
    Key = "Item1",
}).AccessControlList;

// Retrieve owner
Owner owner = acl.Owner;


// Describe grant
S3Grant grant = new S3Grant
{
    Grantee = new S3Grantee { EmailAddress = "sample@example.com" },
    Permission = S3Permission.WRITE_ACP
};

// Create new ACL
S3AccessControlList newAcl = new S3AccessControlList
{
    Grants = new List<S3Grant> { grant },
    Owner = owner
};

// Set new ACL
PutACLResponse response = client.PutACL(new PutACLRequest
{
    BucketName = "amzn-s3-demo-bucket",
    Key = "Item1",
    AccessControlList = acl
});

Version Information

.NET Framework:
Supported in: 4.5 and newer, 3.5

AmazonS3Client.PutACL (PutACLRequest)

Method