Using aws iam with s3control

Question

Pulumi · Accepted Answer

To use AWS Identity and Access Management (IAM) with S3 Control, you would typically need an IAM role with policies that grant permissions to perform actions on the S3 Control service. For instance, you might want to allow an IAM role to create or manage Access Points for Amazon S3 buckets.

Below is a Pulumi program in TypeScript that demonstrates how to create an IAM role with a policy attached that gives permissions to list S3 Access Points. The policy is specified inline using JSON, which is common for IAM policies. Note that inline IAM policies can be applied directly to the role, but it's also possible to create reusable managed policies.

The `aws.iam.Role` resource is used to create a new IAM role. The `assumeRolePolicy` property defines which entities can assume the role. In this case, we're allowing an AWS service (EC2 in this example) to assume the role.

The `aws.iam.RolePolicy` resource is then used to attach an inline policy to the role. The policy document grants `s3:ListAccessPoints` actions, allowing the role to list the Access Points.

Here's a Pulumi program that creates these resources:

```typescript
import * as aws from "@pulumi/aws";

// Create an IAM Role.
const myRole = new aws.iam.Role("myRole", {
    assumeRolePolicy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Effect: "Allow",
                Principal: {
                    Service: "ec2.amazonaws.com",
                },
            },
        ],
    }),
});

// Attach a policy to the IAM role that allows listing S3 Access Points.
const myRolePolicy = new aws.iam.RolePolicy("myRolePolicy", {
    role: myRole.id,
    policy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Action: "s3:ListAccessPoints",
                Effect: "Allow",
                Resource: "*", // Replace with the ARN of the resources if you want to scope down permissions.
            },
        ],
    }),
});

// Export the Role name and ARN
export const roleName = myRole.name;
export const roleArn = myRole.arn;
```

This program uses the following resources:

- `aws.iam.Role`: Represents an IAM role which can be assumed by specified principals (users, applications, or AWS services).
- `aws.iam.RolePolicy`: Defines a policy attached to the IAM role that specifies what actions are allowed on which resources.

To run this code, ensure you have [Pulumi installed](https://www.pulumi.com/docs/get-started/aws/begin/) and have configured your AWS credential. Save this code in a file named `index.ts`, and then run the following commands:

```sh
pulumi up          # Preview and deploy the changes
pulumi stack       # See the outputs of your stack
pulumi destroy     # Tear down all resources
```

Change the policy according to your needs, specifying the exact actions and resources you want the IAM role to be able to interact with. Remember to replace the `Resource` field with the specific ARNs if you want to restrict the role's permissions to specific resources.