Infrastructure as Code Security

Infrastructure as code (IaC) defines servers, networks and cloud resources in files. This roadmap teaches you to write, review and scan IaC so infrastructure is secure by default. Terraform basics and a cloud practice account help.

• Install Terraform
• Have a cloud practice account
• Plan your study time

• CyberA4U Academy — courses

Tools such as Terraform, CloudFormation, Bicep and Pulumi describe infrastructure as code, making it reviewable, repeatable and scannable.

• Compare common IaC tools
• Understand declarative vs imperative approaches
• Know why IaC improves security

Tools & tech: IaC

• What is Terraform?

Terraform uses providers, resources, variables and state to create and update infrastructure.

• Write resources and variables
• Use init, plan and apply
• Understand state

Tools & tech: IaC

• Terraform tutorials

Terraform state can contain secrets and resource details. It must be stored remotely, encrypted and access-controlled.

• Use a remote, encrypted backend
• Restrict access to state
• Avoid secrets in state where possible

Tools & tech: IaC

• Terraform — Sensitive data in state

Modules package reusable infrastructure. Secure modules bake in good defaults so every team gets them automatically.

• Build reusable modules
• Set secure default values
• Version modules

Tools & tech: IaC

• Terraform — Build and use a local module / module development

Common IaC mistakes include public storage, open security groups, missing encryption and wildcard permissions — all detectable before deployment.

• Recognize common misconfigurations in code
• Scan with a tool such as Checkov
• Fix findings at the source

Tools & tech: IaC

• Checkov — static analysis for IaC

Policy-as-code tools such as OPA or Sentinel enforce organization rules on IaC plans automatically.

• Write simple policies
• Evaluate Terraform plans against them
• Integrate policies into CI

Tools & tech: IaC

• Open Policy Agent documentation

Drift happens when someone changes infrastructure outside of code. Detecting it keeps the code the source of truth.

• Detect drift with terraform plan
• Decide whether to revert or codify changes
• Limit console changes

Tools & tech: IaC

• Terraform — Manage resource drift

Passwords and keys must never be hard-coded in IaC files. Use secret managers, sensitive variables and generated credentials.

• Mark variables as sensitive
• Load secrets from a secret manager
• Scan repositories for leaked secrets

Tools & tech: IaC

• Terraform — Sensitive data in state

Separate accounts or projects for production, development and security limit blast radius. IaC manages them consistently.

• Design a multi-account structure
• Deploy baselines to every account with IaC
• Centralize logging and security

Tools & tech: IaC

• AWS Security Reference Architecture

Every infrastructure change should be reviewed as a pull request with the plan output attached.

• Review plans, not just code
• Require approvals for production
• Automate plan comments in pull requests

Tools & tech: IaC

• Terraform CLI — terraform plan

Fix findings in modules and templates so every consumer benefits, rather than patching each deployment by hand.

• Prioritize fixes in shared modules
• Track exceptions with reasons
• Prevent reintroduction with CI checks

Tools & tech: IaC

• Checkov — static analysis for IaC

Put it all together by building and securing a real module: secure defaults, policies, scanning and review.

• Build a module with secure defaults
• Enforce policies and scans in CI
• Document usage

Tools & tech: IaC

Check that you can write, scan, review and enforce secure infrastructure as code.

• Protect state and secrets
• Scan and enforce policies in CI
• Detect and handle drift

• CyberA4U CTF Arena — practice challenges

You can now secure infrastructure as code. Continue with the DevSecOps Pipeline, AWS/Azure/GCP Security or Kubernetes Security roadmaps.

• Keep your modules maintained
• Choose your next roadmap
• Share a secure module

• CyberA4U CTF Arena — practice challenges