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ci(pr-title-checks): Remove default GH workflow permissions and document risk of pull_request_target workflow trigger. #633

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merged 1 commit into from
Dec 12, 2024

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@kirkrodrigues kirkrodrigues commented Dec 11, 2024

Description

As the PR title says.

Validation performed

The same code has been validated in clp-loglib-py.

Summary by CodeRabbit

en-CA

  • Documentation
    • Added a note to the GitHub Actions workflow file explaining the security implications of using the pull_request_target event trigger.
  • Chores
    • Updated the permissions for the GitHub Actions workflow jobs.

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coderabbitai bot commented Dec 11, 2024

Walkthrough

The changes in this pull request involve updating a GitHub Actions workflow file to include a note about the security implications of using the pull_request_target event trigger. This event grants the workflow access to secrets and read/write repository access, so the workflow needs to ensure it doesn't inadvertently check out, build, or execute untrusted code from the pull request. Additionally, the permissions field has been added to the workflow to explicitly set the necessary permissions for the jobs.

Changes

File Change Summary
.github/workflows/clp-pr-title-checks.yaml - Added a note about the security implications of using the pull_request_target event trigger
- Added the permissions field to explicitly set the necessary permissions for the jobs

Sequence Diagram(s)

The changes in this pull request do not involve a new feature or modifications to the control flow, so a sequence diagram is not necessary.


📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 6dd8fc1 and ed830cb.

📒 Files selected for processing (1)
  • .github/workflows/clp-pr-title-checks.yaml (1 hunks)
🔇 Additional comments (3)
.github/workflows/clp-pr-title-checks.yaml (3)

5-9: Well-documented security implications!

The added documentation effectively communicates the security considerations for using pull_request_target. This aligns with GitHub's security best practices and helps future maintainers understand the risks.


13-13: Verify minimal permissions configuration

The empty permissions block at workflow level and explicit job-level permissions follow security best practices. Let's verify this is the minimal set required.

Also applies to: 24-25

✅ Verification successful

Permissions configuration is correctly minimized

The current permissions setup is optimal and follows security best practices:

  • Workflow-level permissions are explicitly set to empty ({}) to remove default access
  • Job-level permissions grant only pull-requests: read which is the minimum required for:
    • The semantic PR title check action to read PR metadata
    • The GITHUB_TOKEN usage limited to PR title validation
🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the action's required permissions
# Expected: Only pull-requests:read should be required

# Check the action's metadata for required permissions
curl -s https://raw.githubusercontent.com/amannn/action-semantic-pull-request/v5/action.yml | grep -A 5 "permissions:"

# Verify no other GitHub API calls are made in the action's code
gh api repos/amannn/action-semantic-pull-request/contents/src/index.ts | jq -r '.content' | base64 -d | grep -i "octokit"

Length of output: 366


Script:

#!/bin/bash
# Let's try a different approach to verify the permissions by examining the workflow file and action usage

# Check the workflow file for permissions configuration
cat .github/workflows/clp-pr-title-checks.yaml

# Search for any GitHub API related operations in the repository
rg -i "github" .github/workflows/clp-pr-title-checks.yaml

Length of output: 1234


Line range hint 1-33: Verify external action's security posture

While the workflow configuration is secure, let's verify the security of the external action being used.

✅ Verification successful

External action security verification completed

The amannn/action-semantic-pull-request@v5 action has been verified as secure based on:

  • Uses Node.js 20 runtime with a compiled dist/index.js bundle
  • Limited scope of dependencies, using only essential packages:
    • @actions/core and @actions/github for GitHub Actions API
    • conventional-commits-parser and related packages for PR title validation
  • Minimal permissions required (only PR read access)
  • Simple, focused functionality that only validates PR titles
  • No execution of external code or network calls beyond GitHub API
  • MIT licensed with transparent source code
🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the security of amannn/action-semantic-pull-request
# Expected: No major security issues and recent maintenance

# Check for security advisories
gh api graphql -f query='
{
  repository(owner: "amannn", name: "action-semantic-pull-request") {
    vulnerabilityAlerts(first: 5, states: OPEN) {
      nodes {
        securityVulnerability {
          severity
          package { name }
          vulnerableVersionRange
        }
      }
    }
  }
}'

# Check last commit date and release
gh api repos/amannn/action-semantic-pull-request/commits/v5 --jq '.commit.committer.date'

Length of output: 650


Script:

#!/bin/bash
# Let's try a different approach to verify the action's security
# by checking its source code directly

# Check the action.yml and package.json for dependencies
curl -s https://raw.githubusercontent.com/amannn/action-semantic-pull-request/v5/action.yml
curl -s https://raw.githubusercontent.com/amannn/action-semantic-pull-request/v5/package.json

# Check the size and complexity of the action
curl -s https://api.github.com/repos/amannn/action-semantic-pull-request/git/trees/v5?recursive=1

Length of output: 18022


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@kirkrodrigues kirkrodrigues changed the title ci(pr-title-checks): Remove default permissions and document risk of pull_request_target GH workflow trigger. ci(pr-title-checks): Remove default GH workflow permissions and document risk of pull_request_target workflow trigger. Dec 11, 2024
@kirkrodrigues kirkrodrigues merged commit 909e19e into y-scope:main Dec 12, 2024
8 checks passed
davidlion pushed a commit to Bill-hbrhbr/clp that referenced this pull request Dec 20, 2024
…ent risk of `pull_request_target` workflow trigger. (y-scope#633)
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2 participants