Permission handling

Let me suggest a few secure approaches to handle permission set automation in AWS:

Use AWS Organizations Service Control Policies (SCPs):

• Create SCPs that restrict who can modify the Lambda function
• Apply strict IAM permissions on the Lambda role itself
• This provides an additional security layer at the organization level

Use AWS CloudFormation StackSets:

• Create permission sets as Infrastructure as Code
• Deploy across multiple accounts from a delegated administrator account
• Better change control through version control
• Requires approval workflows for changes

Use AWS Control Tower:

• Leverage Account Factory
• Implement customized guardrails
• Maintain compliance through preventive and detective controls

Implement CI/CD Pipeline:

• Store permission set configurations in a source code repository
• Require pull request approvals for changes
• Use AWS CodePipeline/CodeBuild with strict IAM roles
• Implement automated testing before deployment

Best Practice Recommendations:

• Keep the automation code in version control
• Implement approval workflows for changes
• Use separate accounts for development and production
• Maintain audit logs of all changes
• Implement least privilege access

The most secure approach would be combining CloudFormation StackSets with a CI/CD pipeline, as it provides:

• Version control
• Change approval process
• Audit trail
• Separation of duties
• Scalable deployment across accounts

This way, developers can propose changes through pull requests, but can't directly modify production permissions.