Set Share ACL

The Set Share ACL operation sets a stored access policy for use with shared access signatures. For more information about setting access policies, see Grant limited access to Azure Storage resources using shared access signatures.

Protocol availability

Enabled file share protocol Available


You can construct the Set Share ACL request as follows. We recommend HTTPS. Replace myaccount with the name of your storage account.

Method Request URI HTTP version

URI parameters

You can specify the following additional parameters on the request URI:

Parameter Description
timeout Optional. The timeout parameter is expressed in seconds. For more information, see Set timeouts for Azure Files operations.

Request headers

The following table describes required and optional request headers:

Request header Description
Authorization Required. Specifies the authorization scheme, account name, and signature. For more information, see Authorize requests to Azure Storage.
Date or x-ms-date Required. Specifies the Coordinated Universal Time (UTC) for the request. For more information, see Authorize requests to Azure Storage.
x-ms-version Required for all authorized requests. Specifies the version of the operation to use for this request. This operation is available only in version 2015-02-21 and later.

For more information, see Versioning for the Azure Storage services.
x-ms-client-request-id Optional. Provides a client-generated, opaque value with a 1-kibibyte (KiB) character limit that's recorded in the Storage Analytics logs when logging is configured. We highly recommend that you use this header to correlate client-side activities with requests that the server receives. For more information, see Monitor Azure Blob Storage.
x-ms-lease-id:<ID> Required if the destination file share has an active lease. Available for version 2020-02-10 and later. If the request doesn't include the lease ID or it isn't valid, the operation fails with status code 412 (Precondition Failed).

If this header is specified and the destination file share doesn't currently have an active lease, the operation fails with status code 412 (Precondition Failed).

Request body

To specify a stored access policy, provide a unique identifier and access policy in the request body for the Set Share ACL operation.

The SignedIdentifier element includes the unique identifier, as specified in the Id element. SignedIdentifier also includes the details of the access policy, as specified in the AccessPolicy element. The maximum length of the unique identifier is 64 characters.

The Start and Expiry fields must be expressed as UTC times and must adhere to a valid ISO 8061 format. Supported ISO 8061 formats include:

  • YYYY-MM-DDThh:mm:ssTZD
  • YYYY-MM-DDThh:mm:ss.fffffffTZD

For the date portion of these formats, YYYY is a four-digit year representation, MM is a two-digit month representation, and DD is a two-digit day representation. For the time portion, hh is the hour representation in 24-hour notation, mm is the two-digit minute representation, ss is the two-digit second representation, and fffffff is the seven-digit millisecond representation. The time designator T separates the date and time portions of the string. The time zone designator TZD specifies a time zone.

<?xml version="1.0" encoding="utf-8"?>  

Sample request

Request Syntax:  
PUT HTTP/1.1  
Request Headers:  
x-ms-version: 2015-02-21  
x-ms-date: <date>  
Authorization: SharedKey myaccount:V47F2tYLS29MmHPhiR8FyiCny9zO5De3kVSF0RYQHmo=  
Request Body:  
<?xml version="1.0" encoding="utf-8"?>  


The response includes an HTTP status code and a set of response headers.

Status code

A successful operation returns status code 200 (OK).

Response headers

The response for this operation includes the following headers. The response might also include additional standard HTTP headers. All standard headers conform to the HTTP/1.1 protocol specification.

Response header Description
ETag Returns the date and time that the container was last modified. The date format follows RFC 1123. For more information, see Representation of date/time values in headers.
Last-Modified Any operation that modifies the share or its properties or metadata updates the last modified time, including setting the file's permissions. Operations on files don't affect the last modified time of the share.
x-ms-request-id Uniquely identifies the request that was made and can be used for troubleshooting the request. For more information, see Troubleshoot API operations.
x-ms-version Indicates the version of Azure Files that was used to execute the request.
Date or x-ms-date A UTC date/time value that indicates the time at which the service sent the response.
x-ms-client-request-id Can be used to troubleshoot requests and corresponding responses. The value of this header is equal to the value of the x-ms-client-request-id header, if it's present in the request and the value is at most 1,024 visible ASCII characters. If the x-ms-client-request-id header is not present in the request, this header won't be present in the response.

Sample response

Response Status:  
HTTP/1.1 200 OK  
Response Headers:  
Transfer-Encoding: chunked  
Date: <date>  
ETag: "0x8CB171613397EAB"  
Last-Modified: <date>  
x-ms-version: 2015-02-21  
Server: Windows-Azure-File/1.0 Microsoft-HTTPAPI/2.0  


Only the account owner can call this operation.


Only the account owner can access resources in a particular share, unless one of the following conditions is true:

  • The owner has specified that share resources are available for public access by setting the permissions on the share.
  • The owner has issued a shared access signature for a resource within the share.

When you set permissions for a container, the existing permissions are replaced. To update the container's permissions, call Get Share ACL to fetch all access policies associated with the container. Modify the access policy that you want to change, and then call Set Share ACL with the complete set of data to perform the update.

Establishing share-level access policies

A stored access policy can specify the start time, expiration time, and permissions for the shared access signatures that it's associated with. Depending on how you want to control access to your share or file resource, you can:

  • Specify all of these parameters within the stored access policy and omit them from the URL for the shared access signature. Doing so permits you to modify the associated signature's behavior or revoke it at any time.
  • Specify one or more of the access policy parameters within the stored access policy, and specify the other parameters on the URL.
  • Specify all of the parameters on the URL. In this case, you can use the stored access policy to revoke the signature but not to modify its behavior.

For more information about setting access policies, see Grant limited access to Azure Storage resources using shared access signatures.

Together, the shared access signature and the stored access policy must include all fields required to authorize the signature. If any required fields are missing, the request will fail. Likewise, if a field is specified both in the shared access signature URL and in the stored access policy, the request will fail with status code 400 (Bad Request). For more information about the fields that compose a shared access signature, see Use a shared access signature.

You can set a maximum of five separate access policies for a share at any time. If more than five access policies are passed in the request body, the service returns status code 400 (Bad Request).

A shared access signature can be issued on a share or a file regardless of whether container data is available for anonymous read access. A shared access signature provides more control over how, when, and to whom a resource is made accessible.

You can't set or retrieve an access policy for a share snapshot. If you try to set an access policy, the service returns status code 400 (InvalidQueryParameterValue).


When you establish a stored access policy on a container, it might take up to 30 seconds to take effect. During this interval, a shared access signature that's associated with the stored access policy will fail with status code 403 (Forbidden), until the access policy becomes active.

See also

Operations on FileShare resources (Azure Files)