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AWS Key Management Service
API Reference (API Version 2014-11-01)

PutKeyPolicy

Attaches a key policy to the specified customer master key (CMK). You cannot perform this operation on a CMK in a different AWS account.

For more information about key policies, see Key Policies in the AWS Key Management Service Developer Guide.

Request Syntax

{
   "BypassPolicyLockoutSafetyCheck": boolean,
   "KeyId": "string",
   "Policy": "string",
   "PolicyName": "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.

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.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 2048.

Required: Yes

Policy

The key policy to attach to the CMK.

If you do not set BypassPolicyLockoutSafetyCheck to true, the policy must meet the following criteria:

  • It must allow the principal that is making the PutKeyPolicy request to make a subsequent PutKeyPolicy request on the CMK. This reduces the likelihood that the CMK becomes unmanageable. For more information, refer to the scenario in the Default Key Policy section in the AWS Key Management Service Developer Guide.

  • The principals that are specified 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 specifying the new principal in a key policy because the new principal might not immediately be visible to AWS KMS. For more information, see Changes that I make are not always immediately visible in the IAM User Guide.

The policy size limit is 32 kilobytes (32768 bytes).

Type: String

Length Constraints: Minimum length of 1. Maximum length of 131072.

Pattern: [\u0009\u000A\u000D\u0020-\u00FF]+

Required: Yes

PolicyName

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

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: [\w]+

Required: Yes

BypassPolicyLockoutSafetyCheck

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

Important

Setting this value to true increases the likelihood that the CMK becomes unmanageable. Do not set this value to true indiscriminately.

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.

Type: Boolean

Required: No

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.

DependencyTimeoutException

The system timed out while trying to fulfill the request. The request can be retried.

HTTP Status Code: 500

InvalidArnException

The request was rejected because a specified ARN was not valid.

HTTP Status Code: 400

KMSInternalException

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

HTTP Status Code: 400

KMSInvalidStateException

The request was rejected because the state of the specified resource is not valid for this request.

For more information about how key state affects the use of a CMK, see How Key State Affects Use of a Customer Master Key in the AWS Key Management Service Developer Guide.

HTTP Status Code: 400

LimitExceededException

The request was rejected because a limit was exceeded. For more information, see Limits in the AWS Key Management Service Developer Guide.

HTTP Status Code: 400

MalformedPolicyDocumentException

The request was rejected because the specified policy is not syntactically or semantically correct.

HTTP Status Code: 400

NotFoundException

The request was rejected because the specified entity or resource could not be found.

HTTP Status Code: 400

UnsupportedOperationException

The request was rejected because a specified parameter is not supported or a specified resource is not valid for this operation.

HTTP Status Code: 400

Examples

Example Request

The following example is formatted for legibility.

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POST / HTTP/1.1 Host: kms.us-east-2.amazonaws.com Content-Length: 2396 X-Amz-Target: TrentService.PutKeyPolicy X-Amz-Date: 20161207T203023Z Content-Type: application/x-amz-json-1.1 Authorization: AWS4-HMAC-SHA256\ Credential=AKIAI44QH8DHBEXAMPLE/20161207/us-east-2/kms/aws4_request,\ SignedHeaders=content-type;host;x-amz-date;x-amz-target,\ Signature=e58ea91db06afc1bc7a1f204769cf6bc4d003ee090095a13caef361c69739ede { "Policy": "{ \"Version\": \"2012-10-17\", \"Id\": \"custom-policy-2016-12-07\", \"Statement\": [ { \"Sid\": \"Enable IAM User Permissions\", \"Effect\": \"Allow\", \"Principal\": { \"AWS\": \"arn:aws:iam::111122223333:root\" }, \"Action\": \"kms:*\", \"Resource\": \"*\" }, { \"Sid\": \"Allow access for Key Administrators\", \"Effect\": \"Allow\", \"Principal\": { \"AWS\": [ \"arn:aws:iam::111122223333:user/ExampleAdminUser\", \"arn:aws:iam::111122223333:role/ExampleAdminRole\" ] }, \"Action\": [ \"kms:Create*\", \"kms:Describe*\", \"kms:Enable*\", \"kms:List*\", \"kms:Put*\", \"kms:Update*\", \"kms:Revoke*\", \"kms:Disable*\", \"kms:Get*\", \"kms:Delete*\", \"kms:ScheduleKeyDeletion\", \"kms:CancelKeyDeletion\" ], \"Resource\": \"*\" }, { \"Sid\": \"Allow use of the key\", \"Effect\": \"Allow\", \"Principal\": { \"AWS\": \"arn:aws:iam::111122223333:role/ExamplePowerUserRole\" }, \"Action\": [ \"kms:Encrypt\", \"kms:Decrypt\", \"kms:ReEncrypt*\", \"kms:GenerateDataKey*\", \"kms:DescribeKey\" ], \"Resource\": \"*\" }, { \"Sid\": \"Allow attachment of persistent resources\", \"Effect\": \"Allow\", \"Principal\": { \"AWS\": \"arn:aws:iam::111122223333:role/ExamplePowerUserRole\" }, \"Action\": [ \"kms:CreateGrant\", \"kms:ListGrants\", \"kms:RevokeGrant\" ], \"Resource\": \"*\", \"Condition\": { \"Bool\": { \"kms:GrantIsForAWSResource\": \"true\" } } } ] }", "PolicyName": "default", "KeyId": "1234abcd-12ab-34cd-56ef-1234567890ab" }

Example Response

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HTTP/1.1 200 OK Server: Server Date: Wed, 07 Dec 2016 20:30:23 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 0 Connection: keep-alive x-amzn-RequestId: fb114d4c-bcbb-11e6-82b3-e9e4af764a06

See Also

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