https://github.com/madhuakula/docker-security-checker

Dockerfile Security Checker using OPA Rego policies with Conftest
https://github.com/madhuakula/docker-security-checker

conftest docker dockerfile infosec opa opa-rego-policies rego security

Last synced: 3 months ago
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Dockerfile Security Checker using OPA Rego policies with Conftest

• Host: GitHub
• URL: https://github.com/madhuakula/docker-security-checker
• Owner: madhuakula
• License: mit
• Created: 2020-05-15T21:31:10.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2022-06-27T10:28:09.000Z (over 2 years ago)
• Last Synced: 2024-07-25T12:49:53.231Z (3 months ago)
• Topics: conftest, docker, dockerfile, infosec, opa, opa-rego-policies, rego, security
• Language: Open Policy Agent
• Homepage: https://blog.madhuakula.com/dockerfile-security-checks-using-opa-rego-policies-with-conftest-32ab2316172f
• Size: 10.7 KB
• Stars: 57
• Watchers: 4
• Forks: 27
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-opa - Docker Security Checker - OPA Rego policies for Dockerfile Security checks using Conftest (Language and Platform Integrations / Docker)
• awesome-hacking-lists - madhuakula/docker-security-checker - Dockerfile Security Checker using OPA Rego policies with Conftest (Open Policy Agent)

README

        
# docker-security-checker

This repository contains OPA Rego policies for `Dockerfile` Security checks using Conftest

* The rego policy rules can be found at [policy/security.rego](policy/security.rego)

## Sample rego policy for using COPY instead of ADD in Dockerfile

```

deny[msg] {

    input[i].Cmd == "add"

    val := concat(" ", input[i].Value)

    msg = sprintf("Use COPY instead of ADD: %s", [val])

}

```

## Running the conftest with security policies

* Run the following command to test security policies against the Dockerfile

```bash

conftest test Dockerfile

```

* Now you can see the below example output

```bash

WARN - Dockerfile - Do not use latest tag with image: ["ubuntu:latest"]

FAIL - Dockerfile - Suspicious ENV key found: ["SECRET", "AKIGG23244GN2344GHG"]

FAIL - Dockerfile - Use COPY instead of ADD: app /app

FAIL - Dockerfile - Use COPY instead of ADD: code /tmp/code

5 tests, 1 passed, 1 warning, 3 failures

```

## Try it out yourself

* I have created this scenario in katacoda playground to learn and try out yourself

[![Katacoda Playground for docker-security-checker](https://miro.medium.com/max/1400/1*gO49knu-MTkDBjChMrFGZA.png)](https://katacoda.com/madhuakula/scenarios/docker-security-linter)

* Read more about it at [https://blog.madhuakula.com/dockerfile-security-checks-using-opa-rego-policies-with-conftest-32ab2316172f](https://blog.madhuakula.com/dockerfile-security-checks-using-opa-rego-policies-with-conftest-32ab2316172f)

## Contribution

* You can add more policies at policy directory with more information by adding comments