# PutBucketPolicy Applies an Amazon S3 bucket policy to an Amazon S3 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 about endpoints in Availability Zones, see [Regional and Zonal endpoints for directory buckets in Availability Zones](https://docs.aws.amazon.com/AmazonS3/latest/userguide/endpoint-directory-buckets-AZ.html) in the *Amazon S3 User Guide*. For more information about endpoints in Local Zones, see [Concepts for directory buckets in Local Zones](https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-lzs-for-directory-buckets.html) in the *Amazon S3 User Guide*. Permissions If you are using an identity other than the root user of the AWS account that owns the bucket, the calling identity must both have the `PutBucketPolicy` permissions on the specified bucket and belong to the bucket owner's account in order to use this operation. If you don't have `PutBucketPolicy` permissions, Amazon S3 returns a `403 Access Denied` error. If you have the correct permissions, but you're not using an identity that belongs to the bucket owner's account, Amazon S3 returns a `405 Method Not Allowed` error. To ensure that bucket owners don't inadvertently lock themselves out of their own buckets, the root principal in a bucket owner's AWS account can perform the `GetBucketPolicy`, `PutBucketPolicy`, and `DeleteBucketPolicy` API actions, even if their bucket policy explicitly denies the root principal's access. Bucket owner root principals can only be blocked from performing these API actions by VPC endpoint policies and AWS Organizations policies. + **General purpose bucket permissions** - The `s3:PutBucketPolicy` permission is required in a policy. For more information about general purpose buckets bucket policies, see [Using Bucket Policies and User Policies](https://docs.aws.amazon.com/AmazonS3/latest/dev/using-iam-policies.html) in the *Amazon S3 User Guide*. + **Directory bucket permissions** - To grant access to this API operation, you must have the `s3express:PutBucketPolicy` 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](https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam.html) in the *Amazon S3 User Guide*. Example bucket policies **General purpose buckets example bucket policies** - See [Bucket policy examples](https://docs.aws.amazon.com/AmazonS3/latest/userguide/example-bucket-policies.html) in the *Amazon S3 User Guide*. **Directory bucket example bucket policies** - See [Example bucket policies for S3 Express One Zone](https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-express-security-iam-example-bucket-policies.html) in the *Amazon S3 User Guide*. HTTP Host header syntax **Directory buckets ** - The HTTP Host header syntax is `s3express-control.region-code.amazonaws.com`. The following operations are related to `PutBucketPolicy`: + [CreateBucket](https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateBucket.html) + [DeleteBucket](https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteBucket.html) **Important** 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`. ## Request Syntax ``` PUT /?policy HTTP/1.1 Host: Bucket.s3.amazonaws.com Content-MD5: ContentMD5 x-amz-sdk-checksum-algorithm: ChecksumAlgorithm x-amz-confirm-remove-self-bucket-access: ConfirmRemoveSelfBucketAccess x-amz-expected-bucket-owner: ExpectedBucketOwner { Policy in JSON format } ``` ## URI Request Parameters The request uses the following URI parameters. ** [Bucket](#API_PutBucketPolicy_RequestSyntax) ** The name of the bucket. **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 Zone (Availability Zone or Local Zone). Bucket names must also follow the format ` bucket-base-name--zone-id--x-s3` (for example, ` DOC-EXAMPLE-BUCKET--usw2-az1--x-s3`). For information about bucket naming restrictions, see [Directory bucket naming rules](https://docs.aws.amazon.com/AmazonS3/latest/userguide/directory-bucket-naming-rules.html) in the *Amazon S3 User Guide* Required: Yes ** [Content-MD5](#API_PutBucketPolicy_RequestSyntax) ** The MD5 hash of the request body. For requests made using the AWS Command Line Interface (CLI) or AWS SDKs, this field is calculated automatically. This functionality is not supported for directory buckets. ** [x-amz-confirm-remove-self-bucket-access](#API_PutBucketPolicy_RequestSyntax) ** Set this parameter to true to confirm that you want to remove your permissions to change this bucket policy in the future. This functionality is not supported for directory buckets. ** [x-amz-expected-bucket-owner](#API_PutBucketPolicy_RequestSyntax) ** 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). 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](#API_PutBucketPolicy_RequestSyntax) ** Indicates the algorithm used to create the checksum for the request 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-algorithm ` or `x-amz-trailer` header sent. Otherwise, Amazon S3 fails the request with the HTTP status code `400 Bad Request`. For the `x-amz-checksum-algorithm ` header, replace ` algorithm ` with the supported algorithm from the following list: + `CRC32` + `CRC32C` + `CRC64NVME` + `SHA1` + `SHA256` For more information, see [Checking object integrity](https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html) in the *Amazon S3 User Guide*. If the individual checksum value you provide through `x-amz-checksum-algorithm ` doesn't match the checksum algorithm you set through `x-amz-sdk-checksum-algorithm`, Amazon S3 fails the request with a `BadDigest` error. 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 | CRC64NVME` ## Request Body The request accepts the following data in JSON format. ** [Policy](#API_PutBucketPolicy_RequestSyntax) ** ## 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 ### Sample Request for general purpose buckets The following request shows the PUT individual policy request for the bucket. ``` PUT /?policy HTTP/1.1 Host: bucket.s3..amazonaws.com Date: Tue, 04 Apr 2010 20:34:56 GMT Authorization: authorization string { "Version":"2008-10-17", "Id":"aaaa-bbbb-cccc-dddd", "Statement" : [ { "Effect":"Allow", "Sid":"1", "Principal" : { "AWS":["111122223333","444455556666"] }, "Action":["s3:*"], "Resource":"arn:aws:s3:::bucket/*" } ] } ``` ### Sample Response for general purpose buckets This example illustrates one usage of PutBucketPolicy. ``` HTTP/1.1 204 No Content x-amz-id-2: Uuag1LuByR5Onimru9SAMPLEAtRPfTaOFg== x-amz-request-id: 656c76696e6727732SAMPLE7374 Date: Tue, 04 Apr 2010 20:34:56 GMT Connection: keep-alive Server: AmazonS3 ``` ## See Also For more information about using this API in one of the language-specific AWS SDKs, see the following: + [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/s3-2006-03-01/PutBucketPolicy) + [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/s3-2006-03-01/PutBucketPolicy)