Security

A comprehensive guide to securing your Terraform configurations and infrastructure deployments.

Provider Authentication

Secure Credentials Management

1. Never Store Credentials in Code

   # DON'T do this
   provider "aws" {
     access_key = "AKIAIOSFODNN7EXAMPLE"  # WRONG!
     secret_key = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"  # WRONG!
   }
   

   Instead, use:

   • Environment variables
   • Instance profiles/managed identities
   • Vault integration
   • Cloud-native credential management

2. Use Provider Authentication Best Practices

   AWS Example:

   provider "aws" {
     region = "us-west-2"
     assume_role {
       role_arn = "arn:aws:iam::ACCOUNT_ID:role/ROLE_NAME"
     }
   }
   

   Azure Example:

   provider "azurerm" {
     features {}
     use_msi = true
   }
   

Infrastructure Security

Network Security

1. Default Security Groups

   resource "aws_security_group" "default" {
     ingress {
       from_port   = 0
       to_port     = 0
       protocol    = "-1"
       cidr_blocks = ["0.0.0.0/0"]  # WRONG!
     }
   }
   

   Instead:

   resource "aws_security_group" "secure" {
     ingress {
       from_port   = 443
       to_port     = 443
       protocol    = "tcp"
       cidr_blocks = [var.allowed_cidr]
     }
   }
   

2. Network Isolation
   • Use private subnets for resources
   • Implement proper network segmentation
   • Use VPC endpoints where possible

Access Management

1. IAM Best Practices
   • Use least privilege principle
   • Implement role-based access control
   • Regular rotation of access keys
   • Enable MFA for user accounts
2. Resource Policies

   resource "aws_s3_bucket" "secure_bucket" {
     bucket = "my-secure-bucket"
        
     versioning {
       enabled = true
     }
        
     server_side_encryption_configuration {
       rule {
         apply_server_side_encryption_by_default {
           sse_algorithm = "AES256"
         }
       }
     }
   }
   

Code Security

Secret Management

1. Use Secret Management Tools
   • HashiCorp Vault
   • AWS Secrets Manager
   • Azure Key Vault
   • Google Secret Manager
2. Sensitive Data Handling

   variable "database_password" {
     type      = string
     sensitive = true
   }
   

Module Security

1. Module Source Control

   module "secure_vpc" {
     source = "git::https://github.com/example/terraform-modules.git//vpc?ref=v1.2.3"
   }
   

2. Version Pinning
   • Pin provider versions
   • Pin module versions
   • Use checksums for external modules

Compliance and Auditing

Compliance Controls

1. Resource Tagging

   resource "aws_instance" "example" {
     tags = {
       Environment = var.environment
       Owner       = var.owner
       CostCenter  = var.cost_center
       Compliance  = var.compliance_level
     }
   }
   

2. Compliance Validation
   • Use terraform-compliance
   • Implement OPA/Conftest
   • Regular security scanning

Audit Logging

1. Enable Provider Logging
   • AWS CloudTrail
   • Azure Activity Logs
   • GCP Audit Logs
2. Infrastructure Changes Tracking
   • Use detailed commit messages
   • Implement change management
   • Track state changes

Security Testing

Automated Security Checks

1. Static Analysis
   • tfsec
   • checkov
   • terrascan
2. Dynamic Testing
   • Inspec
   • ServerSpec
   • Custom validation scripts

Incident Response

Security Incident Handling

1. Preparation
   • Document emergency procedures
   • Maintain backup states
   • Keep destruction procedures ready
2. Recovery
   • State recovery procedures
   • Infrastructure rebuild process
   • Secure state restoration

Security Checklist

• Secure credential management implemented
• Network security controls in place
• IAM policies follow least privilege
• Secret management solution integrated
• Module sources verified and pinned
• Compliance controls implemented
• Audit logging enabled
• Security testing automated
• Incident response procedures documented
• Regular security reviews scheduled