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

• Microsoft Security Development Lifecycle
• OWASP Secure Coding Practices
• VS Code Extension Security Guidelines
• Node.js Security Best Practices

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