ConnectCustomKeyStore - AWS Key Management Service

ConnectCustomKeyStore

Connects or reconnects a custom key store to its backing key store. For an AWS CloudHSM key store, ConnectCustomKeyStore connects the key store to its associated AWS CloudHSM cluster. For an external key store, ConnectCustomKeyStore connects the key store to the external key store proxy that communicates with your external key manager.

The custom key store must be connected before you can create KMS keys in the key store or use the KMS keys it contains. You can disconnect and reconnect a custom key store at any time.

The connection process for a custom key store can take an extended amount of time to complete. This operation starts the connection process, but it does not wait for it to complete. When it succeeds, this operation quickly returns an HTTP 200 response and a JSON object with no properties. However, this response does not indicate that the custom key store is connected. To get the connection state of the custom key store, use the DescribeCustomKeyStores operation.

This operation is part of the custom key stores feature in AWS KMS, which combines the convenience and extensive integration of AWS KMS with the isolation and control of a key store that you own and manage.

The ConnectCustomKeyStore operation might fail for various reasons. To find the reason, use the DescribeCustomKeyStores operation and see the ConnectionErrorCode in the response. For help interpreting the ConnectionErrorCode, see CustomKeyStoresListEntry.

To fix the failure, use the DisconnectCustomKeyStore operation to disconnect the custom key store, correct the error, use the UpdateCustomKeyStore operation if necessary, and then use ConnectCustomKeyStore again.

AWS CloudHSM key store

During the connection process for an AWS CloudHSM key store, AWS KMS finds the AWS CloudHSM cluster that is associated with the custom key store, creates the connection infrastructure, connects to the cluster, logs into the AWS CloudHSM client as the kmsuser CU, and rotates its password.

To connect an AWS CloudHSM key store, its associated AWS CloudHSM cluster must have at least one active HSM. To get the number of active HSMs in a cluster, use the DescribeClusters operation. To add HSMs to the cluster, use the CreateHsm operation. Also, the kmsuser crypto user (CU) must not be logged into the cluster. This prevents AWS KMS from using this account to log in.

If you are having trouble connecting or disconnecting a AWS CloudHSM key store, see Troubleshooting an AWS CloudHSM key store in the AWS Key Management Service Developer Guide.

External key store

When you connect an external key store that uses public endpoint connectivity, AWS KMS tests its ability to communicate with your external key manager by sending a request via the external key store proxy.

When you connect to an external key store that uses VPC endpoint service connectivity, AWS KMS establishes the networking elements that it needs to communicate with your external key manager via the external key store proxy. This includes creating an interface endpoint to the VPC endpoint service and a private hosted zone for traffic between AWS KMS and the VPC endpoint service.

To connect an external key store, AWS KMS must be able to connect to the external key store proxy, the external key store proxy must be able to communicate with your external key manager, and the external key manager must be available for cryptographic operations.

If you are having trouble connecting or disconnecting an external key store, see Troubleshooting an external key store in the AWS Key Management Service Developer Guide.

Cross-account use: No. You cannot perform this operation on a custom key store in a different AWS account.

Required permissions: kms:ConnectCustomKeyStore (IAM policy)

Related operations

Request Syntax

{ "CustomKeyStoreId": "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.

Note

In the following list, the required parameters are described first.

CustomKeyStoreId

Enter the key store ID of the custom key store that you want to connect. To find the ID of a custom key store, use the DescribeCustomKeyStores operation.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 64.

Required: Yes

Response Elements

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

Errors

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

CloudHsmClusterInvalidConfigurationException

The request was rejected because the associated AWS CloudHSM cluster did not meet the configuration requirements for an AWS CloudHSM key store.

  • The AWS CloudHSM cluster must be configured with private subnets in at least two different Availability Zones in the Region.

  • The security group for the cluster (cloudhsm-cluster-<cluster-id>-sg) must include inbound rules and outbound rules that allow TCP traffic on ports 2223-2225. The Source in the inbound rules and the Destination in the outbound rules must match the security group ID. These rules are set by default when you create the AWS CloudHSM cluster. Do not delete or change them. To get information about a particular security group, use the DescribeSecurityGroups operation.

  • The AWS CloudHSM cluster must contain at least as many HSMs as the operation requires. To add HSMs, use the AWS CloudHSM CreateHsm operation.

    For the CreateCustomKeyStore, UpdateCustomKeyStore, and CreateKey operations, the AWS CloudHSM cluster must have at least two active HSMs, each in a different Availability Zone. For the ConnectCustomKeyStore operation, the AWS CloudHSM must contain at least one active HSM.

For information about the requirements for an AWS CloudHSM cluster that is associated with an AWS CloudHSM key store, see Assemble the Prerequisites in the AWS Key Management Service Developer Guide. For information about creating a private subnet for an AWS CloudHSM cluster, see Create a Private Subnet in the AWS CloudHSM User Guide. For information about cluster security groups, see Configure a Default Security Group in the AWS CloudHSM User Guide .

HTTP Status Code: 400

CloudHsmClusterNotActiveException

The request was rejected because the AWS CloudHSM cluster associated with the AWS CloudHSM key store is not active. Initialize and activate the cluster and try the command again. For detailed instructions, see Getting Started in the AWS CloudHSM User Guide.

HTTP Status Code: 400

CustomKeyStoreInvalidStateException

The request was rejected because of the ConnectionState of the custom key store. To get the ConnectionState of a custom key store, use the DescribeCustomKeyStores operation.

This exception is thrown under the following conditions:

  • You requested the ConnectCustomKeyStore operation on a custom key store with a ConnectionState of DISCONNECTING or FAILED. This operation is valid for all other ConnectionState values. To reconnect a custom key store in a FAILED state, disconnect it (DisconnectCustomKeyStore), then connect it (ConnectCustomKeyStore).

  • You requested the CreateKey operation in a custom key store that is not connected. This operations is valid only when the custom key store ConnectionState is CONNECTED.

  • You requested the DisconnectCustomKeyStore operation on a custom key store with a ConnectionState of DISCONNECTING or DISCONNECTED. This operation is valid for all other ConnectionState values.

  • You requested the UpdateCustomKeyStore or DeleteCustomKeyStore operation on a custom key store that is not disconnected. This operation is valid only when the custom key store ConnectionState is DISCONNECTED.

  • You requested the GenerateRandom operation in an AWS CloudHSM key store that is not connected. This operation is valid only when the AWS CloudHSM key store ConnectionState is CONNECTED.

HTTP Status Code: 400

CustomKeyStoreNotFoundException

The request was rejected because AWS KMS cannot find a custom key store with the specified key store name or ID.

HTTP Status Code: 400

KMSInternalException

The request was rejected because an internal exception occurred. The request can be retried.

HTTP Status Code: 500

See Also

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