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README.md

Detective Organization

Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. SPDX-License-Identifier: CC-BY-SA-4.0

Table of Contents

Introduction

The Detective Organization solution will automate enabling Amazon Detective by delegating administration to an account (e.g. Audit or Security Tooling) and configuring Detective for all the existing and future AWS Organization accounts.

Key solution features:

  • Delegates Detective administration to another account (i.e Audit account).
  • Assumes a role in the delegated administrator account to configure organizations management.
  • Adds all existing accounts including the management account as members.

Deployed Resource Details

Architecture

1.0 Organization Management Account

1.1 AWS CloudFormation

  • All resources are deployed via AWS CloudFormation as a StackSet and Stack Instance within the management account or a CloudFormation Stack within a specific account.
  • The Customizations for AWS Control Tower solution deploys all templates as a CloudFormation StackSet.
  • For parameter details, review the AWS CloudFormation templates.

1.2 IAM Roles

  • The Lambda IAM Role is used by the Lambda function to enable the Detective Delegated Administrator Account within each region provided.
  • The Configuration IAM Role is assumed by the Lambda function to configure Detective within the delegated administrator account and all member accounts.

1.3 Compliance Event Rule

  • The Organization Compliance Scheduled Event Rule triggers the AWS Lambda Function to capture AWS Account status updates (e.g. suspended to active).

1.4 Dead Letter Queue (DLQ)

  • SQS dead letter queue used for retaining any failed Lambda events.

1.5 Alarm SNS Topic

  • SNS Topic used to notify subscribers when messages hit the DLQ.

1.6 AWS Lambda Function

  • The Lambda function includes logic to enable and configure Detective.

1.7 Lambda Layer

  • The python boto3 SDK lambda layer to enable capability for lambda to activate all elements of the Detective service.
  • This is downloaded during the deployment process and packaged into a layer that is used by the lambda function in this solution.
  • The Detective API available in the current lambda environment (as of 06/06/2023) is boto3-1.20.32, however, enhanced functionality of the Detective API used in this solution requires at least 1.26.135 (see references below).
  • Note: Future revisions to this solution will remove this layer when boto3 is updated within the lambda environment.

1.8 Lambda CloudWatch Log Group

  • All the AWS Lambda Function logs are sent to a CloudWatch Log Group </aws/lambda/<LambdaFunctionName> to help with debugging and traceability of the actions performed.
  • By default the AWS Lambda Function will create the CloudWatch Log Group and logs are encrypted with a CloudWatch Logs service managed encryption key.
  • Parameters are provided for changing the default log group retention and encryption KMS key.

1.9 Detective

  • The Detective delegated administrator is registered within organizations in the management account using the Detective APIs within each provided region.

2.0 Audit Account (Security Tooling)

The example solutions use Audit Account instead of Security Tooling Account to align with the default account name used within the AWS Control Tower setup process for the Security Account. The Account ID for the Audit Account SSM parameter is populated from the SecurityAccountId parameter within the AWSControlTowerBP-BASELINE-CONFIG StackSet, but is specified manually in other environments, and then stored in an SSM parameter (this is all done in the common prerequisites solution).

2.1 AWS CloudFormation

2.2 Configuration IAM Role

  • IAM role assumed by the Lambda function within the management account to configure Detective within each region provided.

2.3 Detective (Delegated admin)

  • Detective is enabled in the delegated admin account within each provided region.
  • Detective core package, Amazon EKS audit logs and AWS security findings are enabled for the behavior graphs.
  • New organization accounts are automatically enabled as member accounts.

3.0 All Existing and Future Organization Member Accounts

3.1 AWS CloudFormation

3.2 Configuration IAM Role

  • IAM role assumed by the Lambda function within the management account to configure Detective within each account provided.

3.3 Detective (Members)

  • Detective is enabled from the delegated administrator account.

Implementation Instructions

Prerequisites

  1. Download and Stage the SRA Solutions. Note: This only needs to be done once for all the solutions.
  2. Verify that the SRA Prerequisites Solution has been deployed.
  3. Verify that Amazon GuardDuty enabled. If you are not a GuardDuty customer, or have been a GuardDuty customer for less than 48 hours, you cannot enable Detective. You must either enable GuardDuty or wait for 48 hours (see references below).

Solution Deployment

Choose a Deployment Method:

AWS CloudFormation

In the management account (home region), launch the sra-detective-org-main-ssm.yaml template. This uses an approach where some of the CloudFormation parameters are populated from SSM parameters created by the SRA Prerequisites Solution.

aws cloudformation deploy --template-file $HOME/aws-sra-examples/aws_sra_examples/solutions/detective/detective_org/templates/sra-detective-org-main-ssm.yaml --stack-name sra-detective-org-main-ssm --capabilities CAPABILITY_NAMED_IAM --parameter-overrides pGuarddutyEnabledForMoreThan48Hours=<TRUE_OR_FALSE>
Important

Pay close attention to the --parameter-overrides argument. For launching of the AWS Cloudformation stack using one of the commands in the options above to be successful, Amazon GuardDuty must have been enabled for at least 48 hours, and the pGuarddutyEnabledForMoreThan48Hours parameter in the --parameter-overrides argument must be set to true. If it is set to false the stack launch will fail and provide an error.

Verify Solution Deployment

  1. Log into the management account and navigate to the Detective page
    1. Select Settings and then Account Management
    2. Verify that the delegated admin account is set for each region
  2. Log into the Audit account and navigate to the Detective page
    1. Select Settings and then Account Management
    2. Verify the auto-enable organization accounts is ON in each region
    3. Select Settings and then General
    4. Verify the Detective service, AWS security findings and EKS audit logs are enabled in each region
  3. Log into a member account and verify the Detective service is enabled

Solution Update Instructions

  1. Download and Stage the SRA Solutions. Note: Get the latest code and run the staging script.
  2. Update the existing CloudFormation Stack or CFCT configuration. Note: Make sure to update the SRA Solution Version parameter and any new added parameters.

Solution Delete Instructions

  1. In the management account (home region), delete the AWS CloudFormation Stack (sra-detective-org-main-ssm or sra-detective-org-main).
  2. In the management account (home region), verify that the Lambda function processing is complete by confirming no more CloudWatch logs are generated.
  3. In the management account (home region), delete the AWS CloudWatch Log Group (e.g. /aws/lambda/<solution_name>) for the Lambda function deployed.

Instructions to Manually Run the Lambda Function

  1. In the management account (home region), navigate to the AWS Lambda Functions page.
  2. Select the checkbox next to the Lambda Function and select Test from the Actions menu.
  3. Scroll down to view the Test event.
  4. Click the Test button to trigger the Lambda Function with the default values.
  5. Verify that the updates were successful within the expected account(s).

References