Resourcely and IaC Scanners

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Resourcely and IaC Scanning Tools

Resourcely Guardrails, Trivy/tfsec, Checkov, and Terrascan all focus on improving the security and compliance of infrastructure as code by detecting misconfigurations and potential vulnerabilities before deployment.

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Resourcely is a configuration platform in the Terraform ecosystem, featuring policies, templates for deploying Terraform, and assisted remediation.

Terrascan is a static infrastructure as code scanner focusing on vulnerability scanning.

Trivy concentrates on security misconfigurations rather than broader governance. Tfsec is no longer being developed.

Checkov is a static infrastructure as code scanner with many pre-built policies.

Comparing Resourcely and IaC Scanning Tools

Summary

Resourcely

Terrascan

Trivy/tfsec

Checkov

Goal

Streamlining cloud configuration and governance

Policy language for Terraform Enterprise

Static IaC scanning

IaC Policies

CI integration

Customizable Templates for deploying and editing infrastructure

Embedded IDE for designing infrastructure templates and policies

Manage remediation and assist developers with code changes

Primary Interface

CLI

Management

Managed offering

Self-hosted

Deep Dive

Resourcely

Terrascan

Trivy/tfsec

Checkov

Policy Language

Really (Structured Policy Language)

Rego

Rego or Go

Python or YAML

Policies block during CI

Pull request annotations

Writing custom policies

Easy

Hard

Custom blocking behavior

With custom code

IDE for writing and testing policies

Condition policies based on context

Add missing configuration automatically

Tests

Integrated

Write your own

Supported IaC languages

Terraform

Terraform, Kubernetes, CloudFormation, and more

Terraform, Kubernetes, Docker, CloudFormation, and more

Terraform, CloudFormation, ARM templates

Out-of-the-box policies

Yes, hundreds

Yes, some

Yes, few

Yes, 1,000+

GUARDRAIL "[S3] Bucket should be encrypted at rest"
  WHEN aws_s3_bucket
    REQUIRE server_side_encryption_configuration HAS
      rule.apply_server_side_encryption_by_default.sse_algorithm IN ["aws:kms","AES256"]

package aws.s3.encryption

# Define the valid encryption algorithms.
valid_algos = {"aws:kms", "AES256"}

# Condition 1:
# If the bucket's own configuration explicitly defines an encryption rule,
# ensure its sse_algorithm is one of the valid ones.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  algo := input.config.server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
  algo in valid_algos
}

# Condition 2:
# If there is no encryption configuration present in the bucket, we assume
# that the default encryption (SSE-S3 using AES256) is in effect.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  not input.config.server_side_encryption_configuration
  # Additionally, ensure the explicit algorithm field is absent.
  not input.config.server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
}

# Condition 3:
# If a connected encryption configuration resource exists,
# then check its encryption rule for a valid algorithm.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  # Assume connected resources are keyed by their resource type.
  encryption := input.connected_resources["aws_s3_bucket_server_side_encryption_configuration"].config.rule.apply_server_side_encryption_by_default.sse_algorithm
  encryption in valid_algos
}

# Deny if none of the above conditions are met.
deny[msg] {
  input.resource_type == "aws_s3_bucket"
  not s3_encrypted
  msg := "Ensure all data stored in the S3 bucket is securely encrypted at rest (CKV_AWS_19)."
}

package aws.s3.encryption

# Define the valid encryption algorithms.
valid_algos = {"aws:kms", "AES256"}

# Condition 1:
# If the bucket's own configuration explicitly defines an encryption rule,
# ensure its sse_algorithm is one of the valid ones.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  algo := input.config.server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
  algo in valid_algos
}

# Condition 2:
# If there is no encryption configuration present in the bucket, we assume
# that the default encryption (SSE-S3 using AES256) is in effect.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  not input.config.server_side_encryption_configuration
  # Additionally, ensure the explicit algorithm field is absent.
  not input.config.server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
}

# Condition 3:
# If a connected encryption configuration resource exists,
# then check its encryption rule for a valid algorithm.
s3_encrypted {
  input.resource_type == "aws_s3_bucket"
  # Assume connected resources are keyed by their resource type.
  encryption := input.connected_resources["aws_s3_bucket_server_side_encryption_configuration"].config.rule.apply_server_side_encryption_by_default.sse_algorithm
  encryption in valid_algos
}

# Deny if none of the above conditions are met.
deny[msg] {
  input.resource_type == "aws_s3_bucket"
  not s3_encrypted
  msg := "Ensure all data stored in the S3 bucket is securely encrypted at rest (CKV_AWS_19)."
}

metadata:
  name: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
  category: "ENCRYPTION"
  id: "CKV_AWS_19"
definition:
  or:
    - cond_type: attribute
      resource_types:
        - aws_s3_bucket
      attribute: server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
      operator: within
      value:
        - "aws:kms"
        - "AES256"
    - and:
      - cond_type: filter
        attribute: resource_type
        operator: within
        value:
          - aws_s3_bucket
      - cond_type: connection
        resource_types:
          - aws_s3_bucket
        connected_resource_types:
          - aws_s3_bucket_server_side_encryption_configuration
        operator: not_exists
      - cond_type: attribute
        resource_types:
          - aws_s3_bucket
        attribute: server_side_encryption_configuration.rule.apply_server_side_encryption_by_default.sse_algorithm
        operator: not_exists # The default for aws_s3_bucket was changed to be encrypted with SSE-S3 which uses AES256
    - and:
      - cond_type: filter
        attribute: resource_type
        operator: within
        value:
          - aws_s3_bucket
      - cond_type: connection
        resource_types:
          - aws_s3_bucket
        connected_resource_types:
          - aws_s3_bucket_server_side_encryption_configuration
        operator: exists
      - cond_type: attribute
        resource_types:
          - aws_s3_bucket_server_side_encryption_configuration
        attribute: rule.apply_server_side_encryption_by_default.sse_algorithm
        operator: within
        value:
          - "aws:kms"
          - "AES256"

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