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Security Guidelines for ContextShare Development

This document outlines security practices and guidelines for developing and maintaining the ContextShare VS Code extension.

🔒 Security Principles

1. Defense in Depth

  • Multiple layers of security controls
  • Input validation at all boundaries
  • Principle of least privilege
  • Fail securely by default

2. Security by Design

  • Security considerations integrated from the start
  • Threat modeling for new features
  • Regular security reviews
  • Automated security testing

🛡️ Development Security Practices

Code Security

Input Validation:

  • Validate all user inputs (file paths, URLs, configuration)
  • Sanitize filenames and paths to prevent directory traversal
  • Validate remote URLs are HTTPS-only for catalog sources
  • Use path normalization functions consistently

Output Encoding:

  • Sanitize data before display in VS Code UI
  • Escape special characters in generated files
  • Use parameterized queries if database access is added

Error Handling:

  • Don't expose internal paths or sensitive info in error messages
  • Log security events appropriately
  • Handle exceptions gracefully without information disclosure

File System Security

Path Traversal Prevention:

// Good: Validate paths are within expected directories
const safePath = path.resolve(baseDir, userInput);
if (!safePath.startsWith(path.resolve(baseDir))) {
  throw new Error('Invalid path');
}

// Bad: Direct user input to file system
fs.readFile(userInput); // Vulnerable to ../../../etc/passwd

Safe File Operations:

  • Always use absolute paths for file operations
  • Validate file extensions and MIME types
  • Set appropriate file permissions
  • Clean up temporary files

Remote Content Security

HTTPS-Only Policy:

  • All remote catalog sources must use HTTPS
  • Reject HTTP URLs in configuration
  • Validate SSL certificates

Content Validation:

  • Validate JSON structure of remote catalogs
  • Sanitize remote content before processing
  • Implement size limits for remote content
  • Cache with TTL to limit remote requests

🔐 Secrets and Credentials Management

What NOT to Include in Code

  • API keys, tokens, passwords
  • Database connection strings
  • Private keys or certificates
  • Internal URLs or service endpoints
  • Personal information

Secure Configuration

// Good: Environment-based configuration
const apiKey = process.env.API_KEY;
if (!apiKey) {
  throw new Error('API_KEY environment variable required');
}

// Bad: Hardcoded secrets
const apiKey = 'sk-1234567890abcdef'; // Never do this!

Development Secrets

  • Use .env files for local development (add to .gitignore)
  • Use VS Code settings for non-sensitive configuration
  • Document required environment variables in README

🚨 Security Testing

Automated Security Scanning

# Run security audit
npm run security:audit

# Check for secrets
npm run security:scan

# License compliance
npm run license:check

# Full compliance check
npm run compliance:check

Manual Security Review Checklist

  • Input validation for all user-controlled data
  • Path traversal prevention
  • HTTPS enforcement for remote sources
  • No hardcoded secrets or credentials
  • Proper error handling without information disclosure
  • File permissions and cleanup
  • Dependencies are up-to-date and secure

🛠️ Dependency Security

Dependency Management

  • Keep dependencies updated regularly
  • Monitor for security advisories
  • Use npm audit to identify vulnerabilities
  • Review dependency licenses for compliance

Secure Dependency Practices

// package.json security configurations
{
  "engines": {
    "node": ">=18.0.0",
    "vscode": "^1.90.0"
  },
  "scripts": {
    "security:audit": "npm audit --audit-level=moderate",
    "security:audit:fix": "npm audit fix"
  }
}

📊 Security Monitoring

CI/CD Security Gates

  • Security vulnerability scanning on every build
  • License compliance checking
  • Secret scanning in commits
  • Static code analysis

Runtime Security

  • Monitor extension telemetry for anomalies (if added)
  • Log security events appropriately
  • Rate limiting for remote requests
  • Resource usage monitoring

🚨 Incident Response

Security Issue Discovery

  1. Immediate Response:

    • Document the issue privately
    • Assess impact and scope
    • Implement temporary mitigations if needed

  2. Coordination:

    • Follow Microsoft security disclosure policy
    • Coordinate with security team if internal
    • Prepare patches and security updates

  3. Communication:

    • Use SECURITY.md for reporting process
    • Prepare security advisories for significant issues
    • Update affected users through appropriate channels

Vulnerability Reporting

  • Report via SECURITY.md process
  • Include reproduction steps
  • Provide impact assessment
  • Suggest potential mitigations

📋 Security Checklist for Releases

Before releasing new versions:

  • Security audit passes without critical/high issues
  • License compliance check passes
  • No secrets or credentials in code
  • Input validation tested
  • Remote content handling secure
  • Error handling doesn't leak info
  • Dependencies updated and secure
  • Security documentation updated

🔍 Additional Resources

Remember: Security is everyone's responsibility. When in doubt, ask for a security review!