DescribeChapCredentials - Storage Gateway
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Returns an array of Challenge-Handshake Authentication Protocol (CHAP) credentials information for a specified iSCSI target, one for each target-initiator pair. This operation is supported in the volume and tape gateway types.

Request Syntax

{ "TargetARN": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.


The Amazon Resource Name (ARN) of the iSCSI volume target. Use the DescribeStorediSCSIVolumes operation to return to retrieve the TargetARN for specified VolumeARN.

Type: String

Length Constraints: Minimum length of 50. Maximum length of 800.

Required: Yes

Response Syntax

{ "ChapCredentials": [ { "InitiatorName": "string", "SecretToAuthenticateInitiator": "string", "SecretToAuthenticateTarget": "string", "TargetARN": "string" } ] }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


An array of ChapInfo objects that represent CHAP credentials. Each object in the array contains CHAP credential information for one target-initiator pair. If no CHAP credentials are set, an empty array is returned. CHAP credential information is provided in a JSON object with the following fields:

  • InitiatorName: The iSCSI initiator that connects to the target.

  • SecretToAuthenticateInitiator: The secret key that the initiator (for example, the Windows client) must provide to participate in mutual CHAP with the target.

  • SecretToAuthenticateTarget: The secret key that the target must provide to participate in mutual CHAP with the initiator (e.g. Windows client).

  • TargetARN: The Amazon Resource Name (ARN) of the storage volume.

Type: Array of ChapInfo objects


For information about the errors that are common to all actions, see Common Errors.


An internal server error has occurred during the request. For more information, see the error and message fields.

HTTP Status Code: 400


An exception occurred because an invalid gateway request was issued to the service. For more information, see the error and message fields.

HTTP Status Code: 400


Example request

The following example shows a request that returns the CHAP credentials of an iSCSI target.

Sample Request

POST / HTTP/1.1 Host: x-amz-Date: 20120425T120000Z Authorization: CSOC7TJPLR0OOKIRLGOHVAICUFVV4KQNSO5AEMVJF66Q9ASUAAJG Content-type: application/x-amz-json-1.1 x-amz-target: StorageGateway_20120630.DescribeChapCredentials { "TargetARN": "arn:aws:storagegateway:us-east-2:111122223333:gateway/sgw-12A3456B/target/" }

Sample Response

HTTP/1.1 200 OK x-amzn-RequestId: CSOC7TJPLR0OOKIRLGOHVAICUFVV4KQNSO5AEMVJF66Q9ASUAAJG Date: Wed, 25 Apr 2012 12:00:02 GMT Content-type: application/x-amz-json-1.1 Content-length: 235 { "ChapCredentials": { "TargetARN": "arn:aws:storagegateway:us-east-2:111122223333:gateway/sgw-12A3456B/target/", "SecretToAuthenticateInitiator": "111111111111", "InitiatorName": "", "SecretToAuthenticateTarget": "222222222222" } }

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: