Cis AWS Compute 5.7

5.7 Ensure you are using an IAM policy to manage access to buckets in Lightsail (Manual)

Description

The following policy grants a user access to manage a specific bucket in the Amazon Lightsail object storage service.

Rationale

This policy grants access to buckets through the Lightsail console, the AWS Command Line Interface (AWS CLI), AWS API, and AWS SDKs.

Impact

Users who don't have this policy will experience errors when viewing the Objects tab of the bucket management page in the Lightsail console.

Audit Procedure

Using AWS Console

1. Login to AWS Console using https://console.aws.amazon.com
2. Click All services, click IAM under Security, Identity, & Compliance.
3. Click Policies
4. Click in the Filter policies by property or policy name and press enter
5. Type Lightsail and press enter
6. Click on the policy that contains lightsail in the name
7. Make sure the Permissions tab is selected.
8. Confirm the policy looks like this

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "LightsailAccess",
      "Effect": "Allow",
      "Action": "lightsail:*",
      "Resource": "*"
    },
    {
      "Sid": "S3BucketAccess",
      "Effect": "Allow",
      "Action": "s3:*",
      "Resource": ["arn:aws:s3:::<BucketName>/*", "arn:aws:s3:::<BucketName>"]
    }
  ]
}

9. If this policy is in place move to the next step. If it is not in any of the policies listed for lightsail refer to the remediation below.
10. Click on the Policy usage tab
11. Confirm that the correct Group and/or User is listed under Permissions. If there is no one listed here refer to the remediation below.

Using AWS CLI

N/A - This is managed through the AWS Console IAM Policies.

Expected Result

An IAM policy should exist that grants Lightsail and S3 bucket access, and it should be attached to the appropriate users or groups.

Remediation

Using AWS Console

1. Login to AWS Console using https://console.aws.amazon.com
2. Click All services, click IAM under Security, Identity, & Compliance.
3. Click Policies
4. Click Create policy
5. Click on the JSON tab
6. Copy and paste the policy below into the JSON editor replacing the text in there and filling in the Lightsail bucket names. **You can find the Lightsail bucket name in the Lightsail console, Storage, Under buckets.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "LightsailAccess",
      "Effect": "Allow",
      "Action": "lightsail:*",
      "Resource": "*"
    },
    {
      "Sid": "S3BucketAccess",
      "Effect": "Allow",
      "Action": "s3:*",
      "Resource": ["arn:aws:s3:::<BucketName>/*", "arn:aws:s3:::<BucketName>"]
    }
  ]
}

7. Click Next tags
8. Add tags based on your companies outlined Tagging policy that should be in place based on the AWS Foundations Benchmark.
9. Click Next review
10. Click in Name* and give it a name that contains "Lightsail"
11. Review the summary.
12. Click Create policy
13. Click in the Filter policies by property or policy name and press enter
14. Type Lightsail and press enter
15. Click on the Policy name that you just created.
16. Click on the Policy usage tab
17. Click Attach
18. Add in the Users or Group that should have this permission.
19. Click Attach policy

Using AWS CLI

N/A - This is managed through the AWS Console IAM Policies.

Default Value

No IAM policy for Lightsail bucket access exists by default. Access must be explicitly configured.

References

1. https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-bucket-management-policies

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Level 1 | Manual