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@anthonystepvoy/devguard

v0.1.1

Published

Experimental HOME/env isolation for package-manager install scripts

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

anthonystepvoyanthonystepvoy

Keywords

securitynpmsupply-chainsandboxtokensecretsfirewalldevsec

Readme

@anthonystepvoy/devguard

Experimental HOME/env isolation for package-manager install scripts.

npm install -g @anthonystepvoy/devguard
devguard install npm

devguard is a defense-in-depth wrapper for npm, pnpm, yarn, and bun. It reduces what dependency lifecycle scripts can see by running the script phase with a temporary HOME, redirected Windows home variables, no SSH agent socket, and a conservative environment allowlist.

It is not an OS sandbox yet. Absolute paths to real home files, files inside the project directory, and outbound network access are still limitations.

Commands

devguard scan
devguard scan --json
devguard scan --dir ./project

devguard install npm
devguard install pnpm
devguard install yarn
devguard install bun
devguard install npm --cwd ./my-project
devguard install npm -- -D typescript

devguard doctor
devguard audit-log

How npm/pnpm Protection Works

Phase 1: npm install --ignore-scripts   # real HOME, real auth, scripts disabled
Phase 2: npm rebuild                    # temporary HOME, scripts enabled

Private registry auth is available during download. Lifecycle scripts then run with HOME, USERPROFILE, HOMEDRIVE, HOMEPATH, APPDATA, and LOCALAPPDATA pointed at a temporary directory.

What Gets Hidden

  • ~/.npmrc, ~/.ssh, ~/.aws, ~/.config/gh, ~/.docker, ~/.kube through normal HOME-based lookups
  • SSH agent environment variables
  • common secret environment variables such as GITHUB_TOKEN, AWS_SECRET_ACCESS_KEY, OPENAI_API_KEY, ANTHROPIC_API_KEY, GOOGLE_API_KEY, NPM_TOKEN
  • generic *_TOKEN, *_SECRET, *_PASSWORD, *_API_KEY, *_PRIVATE_KEY, and *_CREDENTIAL names

Current Limitations

  • HOME/env redirection only; no OS-level filesystem sandbox yet
  • absolute paths such as /home/name/.ssh/id_rsa or C:\Users\name\.npmrc can bypass v0.1.x protections
  • project files, including project .env, remain visible to lifecycle scripts
  • network policy is advisory only
  • yarn/bun isolation is weaker because package-manager auth files may be copied into the temporary HOME

Diagnostics

devguard doctor

Use doctor to check package-manager discovery, temp directory writability, npm ignore-scripts settings, and known secret-file exposure.

Release Assets

The npm installer downloads a platform binary from GitHub releases and verifies a matching .sha256 file before making it executable.

Repository: https://github.com/anthonystepvoy/devguard