How Amazon Keyspaces (for Apache Cassandra) Works with IAM - Amazon Keyspaces (for Apache Cassandra)

How Amazon Keyspaces (for Apache Cassandra) Works with IAM

Before you use IAM to manage access to Amazon Keyspaces, you should understand what IAM features are available to use with Amazon Keyspaces. To get a high-level view of how Amazon Keyspaces and other AWS services work with IAM, see AWS Services That Work with IAM in the IAM User Guide.

Amazon Keyspaces Identity-Based Policies

With IAM identity-based policies, you can specify allowed or denied actions and resources as well as the conditions under which actions are allowed or denied. Amazon Keyspaces supports specific actions and resources, and condition keys. To learn about all of the elements that you use in a JSON policy, see IAM JSON Policy Elements Reference in the IAM User Guide.

To see the Amazon Keyspaces service-specific resources and actions, and condition context keys that can be used for IAM permissions policies, see the Actions, Resources, and Condition Keys for Amazon Keyspaces (for Apache Cassandra) in the IAM User Guide.

Actions

The Action element of an IAM identity-based policy describes the specific action or actions that will be allowed or denied by the policy. Policy actions usually have the same name as the associated AWS API operation. The action is used in a policy to grant permissions to perform the associated operation.

Policy actions in Amazon Keyspaces use the following prefix before the action: cassandra:. For example, to grant someone permission to create an Amazon Keyspaces keyspace with the Amazon Keyspaces CREATE CQL statement, you include the cassandra:Create action in their policy. Policy statements must include either an Action or NotAction element. Amazon Keyspaces defines its own set of actions that describe tasks that you can perform with this service.

To specify multiple actions in a single statement, separate them with commas as follows:

"Action": [ "cassandra:CREATE", "cassandra:MODIFY" ]

To see a list of Amazon Keyspaces actions, see Actions Defined by Amazon Keyspaces (for Apache Cassandra) in the IAM User Guide.

Resources

The Resource element specifies the object or objects to which the action applies. Statements must include either a Resource or a NotResource element. You specify a resource using an ARN or using the wildcard (*) to indicate that the statement applies to all resources.

In Amazon Keyspaces keyspaces and tables can be used in the Resource element of IAM permissions.

The Amazon Keyspaces keyspace resource has the following ARN:

arn:${Partition}:cassandra:${Region}:${Account}:/keyspace/${KeyspaceName}

The Amazon Keyspaces table resource has the following ARN:

arn:${Partition}:cassandra:${Region}:${Account}:/keyspace/${KeyspaceName}/table/${tableName}

For more information about the format of ARNs, see Amazon Resource Names (ARNs) and AWS Service Namespaces.

For example, to specify the mykeyspace keyspace in your statement, use the following ARN:

"Resource": "arn:aws:cassandra:us-east-1:123456789012:keyspace/mykeyspace"

To specify all keyspaces that belong to a specific account, use the wildcard (*):

"Resource": "arn:aws:cassandra:us-east-1:123456789012:keyspace/*"

Some Amazon Keyspaces actions, such as those for creating resources, cannot be performed on a specific resource. In those cases, you must use the wildcard (*).

"Resource": "*"

To connect to Amazon Keyspaces programmatically with a standard driver, a user must have SELECT access to the system tables, because most drivers read the system keyspaces/tables on connection. For example, to grant SELECT permissions to a user for mytable in mykeyspace, the IAM user must have permissions to read both, mytable and the system keyspace. To specify multiple resources in a single statement, separate the ARNs with commas.

"Resource": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/mykeyspace/table/mytable", "arn:aws:cassandra:us-east-1:111122223333:/keyspace/system*"

To see a list of Amazon Keyspaces resource types and their ARNs, see Resources Defined by Amazon Keyspaces (for Apache Cassandra) in the IAM User Guide. To learn with which actions you can specify the ARN of each resource, see Actions Defined by Amazon Keyspaces (for Apache Cassandra).

Condition Keys

The Condition element (or Condition block) lets you specify conditions in which a statement is in effect. The Condition element is optional. You can build conditional expressions that use condition operators, such as equals or less than, to match the condition in the policy with values in the request.

If you specify multiple Condition elements in a statement, or multiple keys in a single Condition element, AWS evaluates them using a logical AND operation. If you specify multiple values for a single condition key, AWS evaluates the condition using a logical OR operation. All of the conditions must be met before the statement's permissions are granted.

You can also use placeholder variables when you specify conditions. For example, you can grant an IAM user permission to access a resource only if it is tagged with their IAM user name. For more information, see IAM Policy Elements: Variables and Tags in the IAM User Guide.

Amazon Keyspaces defines its own set of condition keys and also supports using some global condition keys. To see all AWS global condition keys, see AWS Global Condition Context Keys in the IAM User Guide.

All Amazon Keyspaces actions support the aws:RequestTag/${TagKey}, the aws:ResourceTag/${TagKey}, and the aws:TagKeys condition keys. For more information, see Amazon Keyspaces Resource Access Based on Tags.

To see a list of Amazon Keyspaces condition keys, see Condition Keys for Amazon Keyspaces (for Apache Cassandra) in the IAM User Guide. To learn with which actions and resources you can use a condition key, see Actions Defined by Amazon Keyspaces (for Apache Cassandra).

Examples

To view examples of Amazon Keyspaces identity-based policies, see Amazon Keyspaces (for Apache Cassandra) Identity-Based Policy Examples.

Amazon Keyspaces Resource-Based Policies

Amazon Keyspaces does not support resource-based policies. To view an example of a detailed resource-based policy page, see https://docs.aws.amazon.com/lambda/latest/dg/access-control-resource-based.html.

Authorization Based on Amazon Keyspaces Tags

You can manage access to your Amazon Keyspaces resources by using tags. To manage resource access based on tags, you provide tag information in the condition element of a policy using the cassandra:ResourceTag/key-name, aws:RequestTag/key-name, or aws:TagKeys condition keys. For more information about tagging Amazon Keyspaces resources, see Adding Tags and Labels to Resources.

To view example identity-based policies for limiting access to a resource based on the tags on that resource, see Amazon Keyspaces Resource Access Based on Tags.

Amazon Keyspaces IAM Roles

An IAM role is an entity within your AWS account that has specific permissions.

Using Temporary Credentials with Amazon Keyspaces

You can use temporary credentials to sign in with federation, assume an IAM role, or to assume a cross-account role. You obtain temporary security credentials by calling AWS STS API operations such as AssumeRole or GetFederationToken.

Amazon Keyspaces supports using temporary credentials with the Amazon Keyspaces authentication plugin. To view an example of how to use the authentication plugin to access a table programmatically, see Accessing Amazon Keyspaces Using the Authentication Plugin.

Service-Linked Roles

Service-linked roles allow AWS services to access resources in other services to complete an action on your behalf. Service-linked roles appear in your IAM account and are owned by the service. An IAM administrator can view but not edit the permissions for service-linked roles.

For details about creating or managing Amazon Keyspaces service-linked roles, see Using Service-Linked Roles for Amazon Keyspaces.

Service Roles

Amazon Keyspaces does not support service roles.