putKeyPolicy method

Future<void> putKeyPolicy({
  1. required String keyId,
  2. required String policy,
  3. required String policyName,
  4. bool? bypassPolicyLockoutSafetyCheck,
})

Attaches a key policy to the specified customer master key (CMK).

For more information about key policies, see Key Policies in the AWS Key Management Service Developer Guide. For help writing and formatting a JSON policy document, see the IAM JSON Policy Reference in the IAM User Guide . For examples of adding a key policy in multiple programming languages, see Setting a key policy in the AWS Key Management Service Developer Guide.

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

Required permissions: kms:PutKeyPolicy (key policy)

Related operations: GetKeyPolicy

May throw NotFoundException. May throw InvalidArnException. May throw MalformedPolicyDocumentException. May throw DependencyTimeoutException. May throw UnsupportedOperationException. May throw KMSInternalException. May throw LimitExceededException. May throw KMSInvalidStateException.

Parameter keyId : A unique identifier for the customer master key (CMK).

Specify the key ID or the Amazon Resource Name (ARN) of the CMK.

For example:

  • Key ID: 1234abcd-12ab-34cd-56ef-1234567890ab
  • Key ARN: arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab
To get the key ID and key ARN for a CMK, use ListKeys or DescribeKey.

Parameter policy : The key policy to attach to the CMK.

The key policy must meet the following criteria:

  • If you don't set BypassPolicyLockoutSafetyCheck to true, the key policy must allow the principal that is making the PutKeyPolicy request to make a subsequent PutKeyPolicy request on the CMK. This reduces the risk that the CMK becomes unmanageable. For more information, refer to the scenario in the Default Key Policy section of the AWS Key Management Service Developer Guide.
  • Each statement in the key policy must contain one or more principals. The principals in the key policy must exist and be visible to AWS KMS. When you create a new AWS principal (for example, an IAM user or role), you might need to enforce a delay before including the new principal in a key policy because the new principal might not be immediately visible to AWS KMS. For more information, see Changes that I make are not always immediately visible in the AWS Identity and Access Management User Guide.
The key policy cannot exceed 32 kilobytes (32768 bytes). For more information, see Resource Quotas in the AWS Key Management Service Developer Guide.

Parameter policyName : The name of the key policy. The only valid value is default.

Parameter bypassPolicyLockoutSafetyCheck : A flag to indicate whether to bypass the key policy lockout safety check.

For more information, refer to the scenario in the Default Key Policy section in the AWS Key Management Service Developer Guide. Use this parameter only when you intend to prevent the principal that is making the request from making a subsequent PutKeyPolicy request on the CMK.

The default value is false.

Implementation

Future<void> putKeyPolicy({
  required String keyId,
  required String policy,
  required String policyName,
  bool? bypassPolicyLockoutSafetyCheck,
}) async {
  ArgumentError.checkNotNull(keyId, 'keyId');
  _s.validateStringLength(
    'keyId',
    keyId,
    1,
    2048,
    isRequired: true,
  );
  ArgumentError.checkNotNull(policy, 'policy');
  _s.validateStringLength(
    'policy',
    policy,
    1,
    131072,
    isRequired: true,
  );
  ArgumentError.checkNotNull(policyName, 'policyName');
  _s.validateStringLength(
    'policyName',
    policyName,
    1,
    128,
    isRequired: true,
  );
  final headers = <String, String>{
    'Content-Type': 'application/x-amz-json-1.1',
    'X-Amz-Target': 'TrentService.PutKeyPolicy'
  };
  await _protocol.send(
    method: 'POST',
    requestUri: '/',
    exceptionFnMap: _exceptionFns,
    // TODO queryParams
    headers: headers,
    payload: {
      'KeyId': keyId,
      'Policy': policy,
      'PolicyName': policyName,
      if (bypassPolicyLockoutSafetyCheck != null)
        'BypassPolicyLockoutSafetyCheck': bypassPolicyLockoutSafetyCheck,
    },
  );
}