AWS Resource Control Policies (RCP) with Terraform Implementation

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AWS has introduced a new organization-level security policy type known as Resource Control Policies (RCP). These policies enable you to secure resources within your organizational accounts effectively. A convenient approach to implementing RCPs is by utilizing Terraform.

Previously, AWS supported Service Control Policies (SCP) at the AWS Organization level, allowing restrictions on the permissions granted to principals within the organization. RCPs function similarly but focus on resource-level permissions across all organization accounts. For example, you can establish an organization-wide policy preventing external principals from accessing any S3 buckets within your organization, regardless of individual bucket settings.

You Should Know:

1. Terraform Implementation for RCPs

To deploy an RCP using Terraform, use the following code:

resource "aws_organizations_resource_control_policy" "example" {
name = "DenyExternalS3Access"
description = "Prevent external access to S3 buckets"
content = <<POLICY
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Deny",
"Action": "s3:",
"Principal": "",
"Resource": "",
"Condition": {
"StringNotEquals": {
"aws:PrincipalOrgID": ["o-xxxxxxxxxxx"]
}
}
}
]
}
POLICY
}
  1. Key AWS CLI Commands for RCP Management
    • List all RCPs in an organization: 
      aws organizations list-resource-control-policies
    • Attach an RCP to an OU or Account: 
      aws organizations attach-resource-control-policy --policy-id rcp-123456789 --target-id ou-xyz987654
    • Detach an RCP: 
      aws organizations detach-resource-control-policy --policy-id rcp-123456789 --target-id ou-xyz987654

3. Linux Command for Policy Validation

Use `jq` to validate JSON policies before applying:

echo '{ "Version": "2012-10-17", "Statement": [...] }' | jq empty

4. Windows PowerShell for AWS Policy Checks

Test-AWSResourcePolicy -PolicyDocument (Get-Content -Raw policy.json)

5. Enforcing RCPs Across Multiple Accounts

Use AWS Control Tower or AWS Organizations to enforce RCPs at scale.

What Undercode Say:

AWS Resource Control Policies (RCPs) enhance security by restricting resource access at an organizational level. Unlike SCPs, which limit principal permissions, RCPs directly govern resource interactions. Implementing them via Terraform ensures consistency, while AWS CLI and PowerShell facilitate management.

Expected Output:

  • Secure S3 buckets from external access.
  • Centralized AWS resource governance.
  • Automated policy enforcement via Terraform.

Prediction:

As cloud environments grow, RCPs will become a standard for enforcing least-privilege access, reducing misconfigurations and data breaches.

Reference:

IT/Security Reporter URL:

Reported By: Darryl Ruggles – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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