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[ aws . kms ]

put-key-policy

Description

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 .

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.

Synopsis

  put-key-policy
--key-id <value>
--policy-name <value>
--policy <value>
[--bypass-policy-lockout-safety-check | --no-bypass-policy-lockout-safety-check]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Options

--key-id (string)

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 .

--policy-name (string)

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

--policy (string)

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 size limit is 32 kilobytes (32768 bytes).

--bypass-policy-lockout-safety-check | --no-bypass-policy-lockout-safety-check (boolean)

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

Warning

Setting this value to true increases the risk 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.

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.

Examples

To change the key policy for a customer master key (CMK)

The following put-key-policy example changes the key policy for a customer managed CMK.

To begin, create a key policy and save it in a local JSON file. In this example, the file is key_policy.json. You can also specify the key policy as a string value of the policy parameter.

The first statement in this key policy gives the AWS account permission to use IAM policies to control access to the CMK. The second statement gives the test-user user permission to run the describe-key and list-keys commands on the CMK.

Contents of key_policy.json:

{
    "Version" : "2012-10-17",
    "Id" : "key-default-1",
    "Statement" : [
        {
            "Sid" : "Enable IAM User Permissions",
            "Effect" : "Allow",
            "Principal" : {
                "AWS" : "arn:aws:iam::111122223333:root"
            },
            "Action" : "kms:",
            "Resource" : "*"
        },
        {
            "Sid" : "Allow Use of Key",
            "Effect" : "Allow",
            "Principal" : {
                "AWS" : "arn:aws:iam::111122223333:user/test-user"
            },
            "Action" : [
                "kms:DescribeKey",
                "kms:ListKeys"
            ],
            "Resource" : "*"
        }
    ]
}

To identify the CMK, this example uses the key ID, but you can also usa key ARN. To specify the key policy, the command uses the policy parameter. To indicate that the policy is in a file, it uses the required file:// prefix. This prefix is required to identify files on all supported operating systems. Finally, the command uses the policy-name parameter with a value of default. This parameter is required, even though default is the only valid value.

aws kms put-key-policy \
    --policy-name default \
    --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
    --policy file://key_policy.json

This command does not produce any output. To verify that the command was effective, use the get-key-policy command. The following example command gets the key policy for the same CMK. The output parameter with a value of text returns a text format that is easy to read.

aws kms get-key-policy \
    --policy-name default \
    --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
    --output text

Output:

{
    "Version" : "2012-10-17",
    "Id" : "key-default-1",
    "Statement" : [
        {
            "Sid" : "Enable IAM User Permissions",
            "Effect" : "Allow",
            "Principal" : {
                "AWS" : "arn:aws:iam::111122223333:root"
            },
            "Action" : "kms:",
            "Resource" : "*"
            },
            {
            "Sid" : "Allow Use of Key",
            "Effect" : "Allow",
            "Principal" : {
                "AWS" : "arn:aws:iam::111122223333:user/test-user"
            },
            "Action" : [ "kms:Describe", "kms:List" ],
            "Resource" : "*"
        }
    ]
}

For more information, see Changing a Key Policy in the AWS Key Management Service Developer Guide.

Output

None