public_buckets

AWS Open S3 Buckets

What It Does

This policy checks all the S3 buckets in an AWS Account for public permissions. The user is emailed a list of offending buckets.

How It Works

• The policy leverages the AWS API to retrieve a list of all S3 buckets and their ACLs.
• The policy identifies all S3 buckets whose grantees contain the URI http://acs.amazonaws.com/groups/global/AllUsers
• The recommendation provided for these S3 buckets is to remove the offending permissions.

Input Parameters

This policy has the following input parameters required when launching the policy.

• Email Addresses - Email addresses of the recipients you wish to notify when new incidents are created.
• Account Number - The Account number for use with the AWS STS Cross Account Role. Leave blank when using AWS IAM Access key and secret. It only needs to be passed when the desired AWS account is different than the one associated with the Flexera One credential. More information is available in our documentation.
• Allow/Deny Regions - Whether to treat Allow/Deny Regions List parameter as allow or deny list. Has no effect if Allow/Deny Regions List is left empty.
• Allow/Deny Regions List - A list of regions to allow or deny for an AWS account. Please enter the regions code if SCP is enabled. See Available Regions in AWS; otherwise, the policy may fail on regions that are disabled via SCP. Leave blank to consider all the regions.

Policy Actions

• Sends an email notification

Prerequisites

This Policy Template uses Credentials for authenticating to datasources -- in order to apply this policy you must have a Credential registered in the system that is compatible with this policy. If there are no Credentials listed when you apply the policy, please contact your Flexera Org Admin and ask them to register a Credential that is compatible with this policy. The information below should be consulted when creating the credential(s).

Credential configuration

For administrators creating and managing credentials to use with this policy, the following information is needed:

• AWS Credential (provider=aws) which has the following permissions:

  • s3:ListAllMyBuckets
  • s3:GetBucketLocation
  • s3:GetBucketAcl
  • sts:GetCallerIdentity

  Example IAM Permission Policy:

  {
      "Version": "2012-10-17",
      "Statement": [
          {
              "Effect": "Allow",
              "Action": [
                  "s3:ListAllMyBuckets",
                  "s3:GetBucketLocation",
                  "s3:GetBucketAcl",
                  "sts:GetCallerIdentity"
              ],
              "Resource": "*"
          }
      ]
  }

• Flexera Credential (provider=flexera) which has the following roles:

  • billing_center_viewer

The Provider-Specific Credentials page in the docs has detailed instructions for setting up Credentials for the most common providers.

Supported Clouds

• AWS

Cost

This policy template does not incur any cloud costs.