bridgecrewio/checkov

Prevent cloud misconfigurations during build-time for Terraform, Cloudformation, Kubernetes and other infrastructure-as-code-languages with Checkov by Bridgecrew.

Checkov is a static code analysis tool for infrastructure-as-code. It scans cloud infrastructure provisioned using Terraform, Cloudformation or Kubernetes and detects security and compliance misconfigurations.

Checkov also powers Bridgecrew, the developer-first platform that codifies and streamlines cloud security throughout the development lifecycle. Bridgecrew identifies, fixes, and prevents misconfigurations in cloud resources and infrastructure-as-code files.

Table of contents

• Features
• Screenshots
• Getting Started
• Support

Features

• 300+ built-in policies cover security and compliance best practices for AWS, Azure & Google Cloud.
• Scans Terraform, AWS CloudFormation and Kubernetes configuration files.
• Detects AWS credentials in EC2 Userdata, Lambda environment variables and Terrafrom providers
• Policies support evaluation of variables to their optional default value.
• Supports in-line suppression of accepted risks or false-positives to reduce recurring scan failures. Also supports global skip from using CLI.
• Output currently available as CLI, JSON or JUnit XML.

Screenshots

Scan results in CLI

Scheduled scan result in Jenkins

Getting started

Installation

pip install checkov

Installation on Alpine:

pip3 install --upgrade pip && pip3 install --upgrade setuptools
pip3 install checkov

or using homebrew (MacOS only)

brew tap bridgecrewio/checkov https://github.com/bridgecrewio/checkov
brew update
brew install checkov

Configure an input folder

checkov -d /user/path/to/iac/code

Or a specific file

checkov -f /user/tf/example.tf

or

checkov -f /user/cloudformation/example.yml

Scan result sample (CLI)

Passed Checks: 1, Failed Checks: 1, Suppressed Checks: 0
Check: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
/main.tf:
	 Passed for resource: aws_s3_bucket.template_bucket 
Check: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
/../regionStack/main.tf:
	 Failed for resource: aws_s3_bucket.sls_deployment_bucket_name       

Start using Checkov by reading the Getting Started page.

Using Docker

docker pull bridgecrew/checkov
docker run -t -v /user/tf:/tf bridgecrew/checkov -d /tf

Suppressing/Ignoring a check

Like any static-analysis tool it is limited by its analysis scope. For example, if a resource is managed manually, or using subsequent configuration management tooling, a suppression can be inserted as a simple code annotation.

Suppression comment format

To skip a check on a given Terraform definition block or CloudFormation resource, apply the following comment pattern inside it’s scope:

checkov:skip=<check_id>:<suppression_comment>

• <check_id> is one of the available check scanners
• <suppression_comment> is an optional suppression reason to be included in the output

Example

The following comment skip the CKV_AWS_20 check on the resource identified by foo-bucket, where the scan checks if an AWS S3 bucket is private. In the example, the bucket is configured with a public read access; Adding the suppress comment would skip the appropriate check instead of the check to fail.

resource "aws_s3_bucket" "foo-bucket" {
  region        = var.region
    #checkov:skip=CKV_AWS_20:The bucket is a public static content host
  bucket        = local.bucket_name
  force_destroy = true
  acl           = "public-read"
}

The output would now contain a SKIPPED check result entry:

...
...
Check: "S3 Bucket has an ACL defined which allows public access."
	SKIPPED for resource: aws_s3_bucket.foo-bucket
	Suppress comment: The bucket is a public static content host
	File: /example_skip_acl.tf:1-25
	
...

To suppress checks in Kubernetes manifests, annotations are used with the following format: checkov.io/skip#: <check_id>=<suppression_comment>

For example:

apiVersion: v1
kind: Pod
metadata:
  name: mypod
  annotations:
    checkov.io/skip1: CKV_K8S_20=I don't care about Privilege Escalation :-O
    checkov.io/skip2: CKV_K8S_14
    checkov.io/skip3: CKV_K8S_11=I have not set CPU limits as I want BestEffort QoS
spec:
  containers:
...

Logging

For detailed logging to stdout setup the environment variable LOG_LEVEL to DEBUG.

Default is LOG_LEVEL=WARNING.

Skipping directories

To skip a whole directory, use the environment variable CKV_IGNORED_DIRECTORIES. Default is CKV_IGNORED_DIRECTORIES=node_modules,.terraform,.serverless

Alternatives

For Terraform compliance scanners check out tfsec, Terrascan and Terraform AWS Secure Baseline.

For CloudFormation scanning check out cfripper and cfn_nag.

For Kubernetes scanning check out kube-scan and Polaris.

Contributing

Contribution is welcomed!

Start by reviewing the contribution guidelines. After that, take a look at a good first issue.

Looking to contribute new checks? Learn how to write a new check (AKA policy) here.

Support

Bridgecrew builds and maintains Checkov to make policy-as-code simple and accessible.

Start with our Documentation for quick tutorials and examples.

If you need direct support you can contact us at info@bridgecrew.io .