poutine

poutine

Created by BoostSecurity.io, poutine is a security scanner that detects misconfigurations and vulnerabilities in the build pipelines of a repository. It supports parsing CI workflows from GitHub Actions and Gitlab CI/CD. When given an access token with read-level access, poutine can analyze all the repositories of an organization to quickly gain insights into the security posture of the organization's software supply chain.

See the documentation for a list of rules currently supported by poutine.

Why poutine?

In French, the word "poutine", when not referring to the dish, can be used to mean "messy". Inspired by the complexity and intertwined dependencies of modern open-source projects, poutine reflects both a nod to our Montreal roots and the often messy, complex nature of securing software supply chains.

Supported Platforms

• GitHub Actions
• Gitlab Pipelines
• Azure DevOps
• Pipelines As Code Tekton

Getting Started

Installation

To install poutine, download the latest release from the releases page and add the binary to your $PATH.

Homebrew

brew install poutine

Docker

docker run -e GH_TOKEN ghcr.io/boostsecurityio/poutine:latest

GitHub Actions

...
jobs:
  poutine:
    runs-on: ubuntu-latest
    permissions:
      security-events: write
      contents: read
    steps:
    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
#################################################################################################
    - name: poutine - GitHub Actions SAST
      uses: boostsecurityio/poutine-action@main # We recommend to use a tagged version and pin it
#################################################################################################
    - name: Upload poutine SARIF file
      uses: github/codeql-action/upload-sarif@4355270be187e1b672a7a1c7c7bae5afdc1ab94a # v3.24.10
      with:
        sarif_file: results.sarif

Usage

poutine [command] [arguments] [options]

Analyze a local repository

poutine analyze_local .

Analyze a remote GitHub repository

poutine analyze_repo org/repo --token "$GH_TOKEN"

Analyze all repositories in a GitHub organization

poutine analyze_org org --token "$GH_TOKEN"

Analyze all projects in a self-hosted Gitlab instance

poutine analyze_org my-org/project --token "$GL_TOKEN" --scm gitlab --scm-base-url https://gitlab.example.com

Configuration Options

--token          SCM access token (required for the commands analyze_repo, analyze_org) (env: GH_TOKEN)
--format         Output format (default: pretty, json, sarif)
--ignore-forks   Ignore forked repositories in the organization(analyze_org)
--scm            SCM platform (default: github, gitlab)
--scm-base-url   Base URI of the self-hosted SCM instance
--threads        Number of threads to use (default: 2)
--config         Path to the configuration file (default: .poutine.yml)
--skip           Add rules to the skip list for the current run (can be specified multiple times)
--verbose        Enable debug logging

See .poutine.sample.yml for an example configuration file.

Custom Rules

poutine supports custom Rego rules to extend its security scanning capabilities. You can write your own rules and include them at runtime.

Configuration

Create a .poutine.yml configuration file in your current working directory, or use a custom path with the --config flag:

poutine analyze_local . --config my-config.yml

In your configuration file, specify the path(s) to your custom rules using the include directive:

include:
  - path: ./custom_rules
  - path: ./github_actions

Writing Custom Rules

Custom Rego rules must:

1. Be saved as *.rego files in the included directory
2. Follow the package naming convention: package rules.<rule_name>
3. Define a rule variable with metadata
4. Define a results set containing findings

Example custom rule:

package rules.custom_injection

import data.poutine
import rego.v1

# METADATA
# title: Custom Injection Detection
# description: Detects potential injection vulnerabilities in workflows
# custom:
#   level: warning

rule := poutine.rule(rego.metadata.chain())

# Define pattern to detect (properly escaped for Rego)
patterns.github contains `\\$\\{\\{[^\\}]+\\}\\}`

results contains poutine.finding(rule, pkg.purl, {
  "path": workflow.path,
  "line": step.lines.run,
  "job": job.id,
  "step": i,
  "details": "Potential injection found in step",
}) if {
  pkg := input.packages[_]
  workflow := pkg.github_actions_workflows[_]
  job := workflow.jobs[_]
  step := job.steps[i]
  step.run  # Ensure step has a run command
  regex.match(patterns.github[_], step.run)
}

Key points:

• Use import data.poutine and import rego.v1 for modern Rego syntax and poutine utilities
• Use rule := poutine.rule(rego.metadata.chain()) to extract metadata from METADATA comments
• The package name determines the rule identifier (e.g., package rules.custom_injection → rule ID: custom_injection)
• Add METADATA comments to describe the rule with title, description, and level
• Set the severity level to note, warning, or error
• Use poutine.finding(rule, pkg.purl, {...}) to create findings that match the poutine schema
• The results set should contain findings with fields like path, line, job, step, details

For more examples, see:

• poutine-rules repository - External rule examples
• Built-in rules in opa/rego/rules/ directory
• .poutine.sample.yml - Configuration examples

Acknowledging Findings

poutine supports skipping (acknowledging) specific findings that are not relevant in your context. This can be useful when:

• A finding is a false positive
• The security concern has been addressed through other means (e.g., hardened self-hosted runners)
• You've accepted the risk for a particular finding

To acknowledge findings, you can either:

1. Add a skip section to your .poutine.yml configuration file
2. Use the --skip command-line flag (e.g., --skip rule_name) for one-time skipping

Configuration File

Add a skip section to your .poutine.yml configuration file. Each skip rule can filter findings by:

• job: Filter by job name
• level: Filter by severity level (note, warning, error)
• path: Filter by workflow file path
• rule: Filter by rule name
• purl: Filter by package URL
• osv_id: Filter by OSV ID

Example configuration:

skip:
  # Skip all note-level findings
  - level: note

  # Skip findings in a specific workflow
  - path: .github/workflows/safe.yml

  # Skip a specific rule everywhere
  - rule: unpinnable_action

  # Skip a rule for specific workflows
  - rule: pr_runs_on_self_hosted
    path:
      - .github/workflows/pr.yml
      - .github/workflows/deploy.yml

  # Skip findings for specific packages
  - rule: github_action_from_unverified_creator_used
    purl:
      - pkg:githubactions/dorny/paths-filter

For more examples, see .poutine.sample.yml.

Command Line

You can also skip rules on the command line using the --skip flag. Note that the command-line flag only supports skipping rules by name globally and does not support the granular filtering options (job, path, level, etc.) available in the configuration file.

# Skip a single rule globally
poutine analyze_repo org/repo --skip unpinnable_action

# Skip multiple rules globally
poutine analyze_repo org/repo --skip unpinnable_action --skip pr_runs_on_self_hosted

This is useful for one-time analysis or when you want to temporarily ignore specific rules without modifying your configuration file. For more granular control (e.g., skipping a rule only in specific workflows), use the configuration file instead.

AI Coding Assistant Integration (MCP)

poutine can be integrated with AI coding assistants like Claude Code, Gemini, etc. through the Model Context Protocol (MCP). This allows AI assistants to analyze repositories and validate CI/CD pipelines directly from your development environment.

For detailed setup instructions for your specific AI coding tool, see the MCP Integration Guide.

Building from source

Building poutine requires Go 1.25+.

git clone https://github.com/boostsecurityio/poutine.git
cd poutine
make build

Development

Updating Build Platform CVE Database

go test -tags build_platform_vuln_database ./...
opa fmt -w opa/rego/external/build_platform.rego

See Also

For examples of vulnerabilities in GitHub Actions workflows, you can explore the Messy poutine GitHub organization. It showcases real-world vulnerabilities from open-source projects readily exploitable for educational purposes.

To get started with some hints, try using poutine to analyze the messypoutine organization:

poutine analyze_org messypoutine --token `gh auth token`

You may submit the flags you find in a private vulnerability disclosure.

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.