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[ aws . kms ]

create-grant

Description

Adds a grant to a customer master key (CMK).

A grant is a policy instrument that allows AWS principals to use AWS KMS customer master keys (CMKs) in cryptographic operations. It also can allow them to view a CMK ( DescribeKey ) and create and manage grants. When authorizing access to a CMK, grants are considered along with key policies and IAM policies. Grants are often used for temporary permissions because you can create one, use its permissions, and delete it without changing your key policies or IAM policies.

For detailed information about grants, including grant terminology, see Using grants in the * AWS Key Management Service Developer Guide * . For examples of working with grants in several programming languages, see Programming grants .

The CreateGrant operation returns a GrantToken and a GrantId .

  • When you create, retire, or revoke a grant, there might be a brief delay, usually less than five minutes, until the grant is available throughout AWS KMS. This state is known as eventual consistency . Once the grant has achieved eventual consistency, the grantee principal can use the permissions in the grant without identifying the grant. However, to use the permissions in the grant immediately, use the GrantToken that CreateGrant returns. For details, see Using a grant token in the * AWS Key Management Service Developer Guide * .
  • The CreateGrant operation also returns a GrantId . You can use the GrantId and a key identifier to identify the grant in the RetireGrant and RevokeGrant operations. To find the grant ID, use the ListGrants or ListRetirableGrants operations.

For information about symmetric and asymmetric CMKs, see Using Symmetric and Asymmetric CMKs in the AWS Key Management Service Developer Guide . For more information about grants, see Grants in the * AWS Key Management Service Developer Guide * .

The CMK that you use for this operation must be in a compatible key state. For details, see Key state: Effect on your CMK in the AWS Key Management Service Developer Guide .

Cross-account use : Yes. To perform this operation on a CMK in a different AWS account, specify the key ARN in the value of the KeyId parameter.

Required permissions : kms:CreateGrant (key policy)

Related operations:

  • ListGrants
  • ListRetirableGrants
  • RetireGrant
  • RevokeGrant

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.

Synopsis

  create-grant
--key-id <value>
--grantee-principal <value>
[--retiring-principal <value>]
--operations <value>
[--constraints <value>]
[--grant-tokens <value>]
[--name <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Options

--key-id (string)

Identifies the customer master key (CMK) for the grant. The grant gives principals permission to use this CMK.

Specify the key ID or key ARN of the CMK. To specify a CMK in a different AWS account, you must use the key ARN.

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 .

--grantee-principal (string)

The identity that gets the permissions specified in the grant.

To specify the principal, use the Amazon Resource Name (ARN) of an AWS principal. Valid AWS principals include AWS accounts (root), IAM users, IAM roles, federated users, and assumed role users. For examples of the ARN syntax to use for specifying a principal, see AWS Identity and Access Management (IAM) in the Example ARNs section of the AWS General Reference .

--retiring-principal (string)

The principal that is given permission to retire the grant by using RetireGrant operation.

To specify the principal, use the Amazon Resource Name (ARN) of an AWS principal. Valid AWS principals include AWS accounts (root), IAM users, federated users, and assumed role users. For examples of the ARN syntax to use for specifying a principal, see AWS Identity and Access Management (IAM) in the Example ARNs section of the AWS General Reference .

--operations (list)

A list of operations that the grant permits.

The operation must be supported on the CMK. For example, you cannot create a grant for a symmetric CMK that allows the Sign operation, or a grant for an asymmetric CMK that allows the GenerateDataKey operation. If you try, AWS KMS returns a ValidationError exception. For details, see Grant operations in the AWS Key Management Service Developer Guide .

(string)

Syntax:

"string" "string" ...

Where valid values are:
  Decrypt
  Encrypt
  GenerateDataKey
  GenerateDataKeyWithoutPlaintext
  ReEncryptFrom
  ReEncryptTo
  Sign
  Verify
  GetPublicKey
  CreateGrant
  RetireGrant
  DescribeKey
  GenerateDataKeyPair
  GenerateDataKeyPairWithoutPlaintext

--constraints (structure)

Specifies a grant constraint.

AWS KMS supports the EncryptionContextEquals and EncryptionContextSubset grant constraints. Each constraint value can include up to 8 encryption context pairs. The encryption context value in each constraint cannot exceed 384 characters.

These grant constraints allow a cryptographic operation only when the encryption context in the request matches (EncryptionContextEquals ) or includes (EncryptionContextSubset ) the encryption context specified in this structure. For more information about encryption context, see Encryption Context in the * AWS Key Management Service Developer Guide * . For information about grant constraints, see Using grant constraints in the AWS Key Management Service Developer Guide .

The encryption context grant constraints are supported only on operations that include an encryption context. You cannot use an encryption context grant constraint for cryptographic operations with asymmetric CMKs or for management operations, such as DescribeKey or RetireGrant .

EncryptionContextSubset -> (map)

A list of key-value pairs that must be included in the encryption context of the cryptographic operation request. The grant allows the cryptographic operation only when the encryption context in the request includes the key-value pairs specified in this constraint, although it can include additional key-value pairs.

key -> (string)

value -> (string)

EncryptionContextEquals -> (map)

A list of key-value pairs that must match the encryption context in the cryptographic operation request. The grant allows the operation only when the encryption context in the request is the same as the encryption context specified in this constraint.

key -> (string)

value -> (string)

Shorthand Syntax:

EncryptionContextSubset={KeyName1=string,KeyName2=string},EncryptionContextEquals={KeyName1=string,KeyName2=string}

JSON Syntax:

{
  "EncryptionContextSubset": {"string": "string"
    ...},
  "EncryptionContextEquals": {"string": "string"
    ...}
}

--grant-tokens (list)

A list of grant tokens.

Use a grant token when your permission to call this operation comes from a new grant that has not yet achieved eventual consistency . For more information, see Grant token in the AWS Key Management Service Developer Guide .

(string)

Syntax:

"string" "string" ...

--name (string)

A friendly name for the grant. Use this value to prevent the unintended creation of duplicate grants when retrying this request.

When this value is absent, all CreateGrant requests result in a new grant with a unique GrantId even if all the supplied parameters are identical. This can result in unintended duplicates when you retry the CreateGrant request.

When this value is present, you can retry a CreateGrant request with identical parameters; if the grant already exists, the original GrantId is returned without creating a new grant. Note that the returned grant token is unique with every CreateGrant request, even when a duplicate GrantId is returned. All grant tokens for the same grant ID can be used interchangeably.

--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 create a grant

The following create-grant example creates a grant that allows the exampleUser user to use the decrypt command on the 1234abcd-12ab-34cd-56ef-1234567890ab example CMK. The retiring principal is the adminRole role. The grant uses the EncryptionContextSubset grant constraint to allow this permission only when the encryption context in the decrypt request includes the "Department": "IT" key-value pair.

aws kms create-grant \
    --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
    --grantee-principal arn:aws:iam::123456789012:user/exampleUser \
    --operations Decrypt \
    --constraints EncryptionContextSubset={Department=IT} \
    --retiring-principal arn:aws:iam::123456789012:role/adminRole

The output of this command includes the ID of the new grant and a grant token. You can use the ID and token to identify the grant to other AWS KMS CLI commands, including retire-grant and revoke-grant.

{
    "GrantId": "1a2b3c4d2f5e69f440bae30eaec9570bb1fb7358824f9ddfa1aa5a0dab1a59b2",
    "GrantToken": "<grant token here>"
}

To view detailed information about the grant, use the list-grants command.

For more information, see Using Grants in the AWS Key Management Service Developer Guide.

Output

GrantToken -> (string)

The grant token.

Use a grant token when your permission to call this operation comes from a new grant that has not yet achieved eventual consistency . For more information, see Grant token in the AWS Key Management Service Developer Guide .

GrantId -> (string)

The unique identifier for the grant.

You can use the GrantId in a ListGrants , RetireGrant , or RevokeGrant operation.