AWS CLI Command Reference

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[ aws . s3api ]

get-bucket-policy

Description

Returns the policy of a specified 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 in the Amazon S3 User Guide . For more information about endpoints in Local Zones, see Concepts for directory buckets in Local Zones in the Amazon S3 User Guide .

Permissions

If you are using an identity other than the root user of the Amazon Web Services account that owns the bucket, the calling identity must both have the GetBucketPolicy permissions on the specified bucket and belong to the bucket owner’s account in order to use this operation.

If you don’t have GetBucketPolicy 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.

Warning

To ensure that bucket owners don’t inadvertently lock themselves out of their own buckets, the root principal in a bucket owner’s Amazon Web Services 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 Amazon Web Services Organizations policies.

  • General purpose bucket permissions - The s3:GetBucketPolicy permission is required in a policy. For more information about general purpose buckets bucket policies, see Using Bucket Policies and User Policies in the Amazon S3 User Guide .

  • Directory bucket permissions - To grant access to this API operation, you must have the s3express:GetBucketPolicy 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 Amazon Web Services account that owns the resource. For more information about directory bucket policies and permissions, see Amazon Web Services Identity and Access Management (IAM) for S3 Express One Zone in the Amazon S3 User Guide .

    Example bucket policies

General purpose buckets example bucket policies - See Bucket policy examples in the Amazon S3 User Guide .

Directory bucket example bucket policies - See Example bucket policies for S3 Express One Zone 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 action is related to GetBucketPolicy :

See also: AWS API Documentation

Synopsis

  get-bucket-policy
--bucket <value>
[--expected-bucket-owner <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]

Options

--bucket (string)

The bucket name to get the bucket policy for.

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 in the Amazon S3 User Guide

Access points - When you use this API operation with an access point, provide the alias of the access point in place of the bucket name.

Object Lambda access points - When you use this API operation with an Object Lambda access point, provide the alias of the Object Lambda access point in place of the bucket name. If the Object Lambda access point alias in a request is not valid, the error code InvalidAccessPointAliasError is returned. For more information about InvalidAccessPointAliasError , see List of Error Codes .

Note

Object Lambda access points are not supported by directory buckets.

--expected-bucket-owner (string)

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).

Note

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 .

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

The following command retrieves the bucket policy for a bucket named amzn-s3-demo-bucket:

aws s3api get-bucket-policy --bucket amzn-s3-demo-bucket

Output:

{
    "Policy": "{\"Version\":\"2008-10-17\",\"Statement\":[{\"Sid\":\"\",\"Effect\":\"Allow\",\"Principal\":\"*\",\"Action\":\"s3:GetObject\",\"Resource\":\"arn:aws:s3:::amzn-s3-demo-bucket/*\"},{\"Sid\":\"\",\"Effect\":\"Deny\",\"Principal\":\"*\",\"Action\":\"s3:GetObject\",\"Resource\":\"arn:aws:s3:::amzn-s3-demo-bucket/secret/*\"}]}"
}

Get and put a bucket policy

The following example shows how you can download an Amazon S3 bucket policy, make modifications to the file, and then use put-bucket-policy to apply the modified bucket policy. To download the bucket policy to a file, you can run:

aws s3api get-bucket-policy --bucket amzn-s3-demo-bucket --query Policy --output text > policy.json

You can then modify the policy.json file as needed. Finally you can apply this modified policy back to the S3 bucket by running:

aws s3api put-bucket-policy --bucket amzn-s3-demo-bucket --policy file://policy.json

Output

Policy -> (string)

The bucket policy as a JSON document.