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docs/security/SECURITY_GUIDELINES.md

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+# 🔐 Security Guidelines
+
+*Comprehensive security guidelines for homelab infrastructure*
+
+## Overview
+Security best practices and guidelines for maintaining a secure homelab environment while balancing usability and functionality.
+
+## Network Security
+
+### Network Segmentation
+- **VLAN isolation**: Separate networks for different service tiers
+- **DMZ configuration**: Isolated zone for public-facing services
+- **Management network**: Dedicated network for administration
+- **IoT isolation**: Separate network for IoT devices
+
+### Firewall Configuration
+- **Default deny**: Block all traffic by default
+- **Explicit allow**: Only permit required traffic
+- **Geo-blocking**: Block traffic from suspicious countries
+- **Rate limiting**: Prevent brute force attacks
+
+### VPN Security
+- **WireGuard**: Modern, secure VPN protocol
+- **Tailscale**: Zero-trust mesh networking
+- **Certificate-based auth**: Strong authentication methods
+- **Regular key rotation**: Periodic key updates
+
+## Access Control
+
+### Authentication
+- **Multi-factor authentication**: Required for all admin access
+- **Strong passwords**: Minimum complexity requirements
+- **Password managers**: Centralized password management
+- **Biometric authentication**: Where supported
+
+### Authorization
+- **Principle of least privilege**: Minimal required permissions
+- **Role-based access**: Defined user roles and permissions
+- **Regular access reviews**: Periodic permission audits
+- **Automated deprovisioning**: Remove unused accounts
+
+### Single Sign-On (SSO)
+- **Authentik integration**: Centralized authentication
+- **SAML/OIDC**: Standard authentication protocols
+- **Session management**: Secure session handling
+- **Audit logging**: Track authentication events
+
+## Container Security
+
+### Image Security
+- **Trusted registries**: Use official/verified images
+- **Image scanning**: Vulnerability assessment
+- **Minimal base images**: Reduce attack surface
+- **Regular updates**: Keep images current
+
+### Runtime Security
+- **Non-root containers**: Run as unprivileged users
+- **Resource limits**: Prevent resource exhaustion
+- **Network policies**: Restrict container networking
+- **Security contexts**: Apply security constraints
+
+### Secrets Management
+- **Docker secrets**: Secure secret distribution
+- **Environment variables**: Avoid secrets in env vars
+- **External secret stores**: HashiCorp Vault integration
+- **Secret rotation**: Regular secret updates
+
+## Data Protection
+
+### Encryption
+- **Data at rest**: Encrypt stored data
+- **Data in transit**: TLS/SSL for all communications
+- **Database encryption**: Encrypt sensitive databases
+- **Backup encryption**: Encrypt all backups
+
+### Backup Security
+- **3-2-1 rule**: 3 copies, 2 different media, 1 offsite
+- **Immutable backups**: Prevent backup tampering
+- **Backup testing**: Regular restore testing
+- **Access controls**: Restrict backup access
+
+### Data Classification
+- **Public data**: No special protection required
+- **Internal data**: Standard protection measures
+- **Confidential data**: Enhanced protection required
+- **Restricted data**: Maximum protection measures
+
+## System Hardening
+
+### Operating System
+- **Minimal installation**: Remove unnecessary packages
+- **Security updates**: Automated security patching
+- **Service hardening**: Secure service configurations
+- **Audit logging**: Comprehensive system logging
+
+### SSH Security
+- **Key-based authentication**: Disable password auth
+- **Non-standard ports**: Change default SSH port
+- **Fail2ban**: Automated intrusion prevention
+- **SSH hardening**: Secure SSH configuration
+
+### Web Services
+- **HTTPS only**: Force encrypted connections
+- **Security headers**: Implement security headers
+- **Input validation**: Sanitize all user input
+- **Rate limiting**: Prevent abuse
+
+## Monitoring & Incident Response
+
+### Security Monitoring
+- **Log aggregation**: Centralized log collection
+- **SIEM integration**: Security information management
+- **Anomaly detection**: Identify unusual activity
+- **Real-time alerts**: Immediate threat notification
+
+### Vulnerability Management
+- **Regular scanning**: Automated vulnerability scans
+- **Patch management**: Timely security updates
+- **Risk assessment**: Prioritize vulnerabilities
+- **Remediation tracking**: Track fix implementation
+
+### Incident Response
+- **Response plan**: Documented incident procedures
+- **Communication plan**: Stakeholder notification
+- **Evidence preservation**: Forensic data collection
+- **Post-incident review**: Learn from incidents
+
+## Compliance & Governance
+
+### Security Policies
+- **Acceptable use**: Define acceptable system use
+- **Data handling**: Data protection procedures
+- **Access management**: User access procedures
+- **Change management**: Secure change processes
+
+### Documentation
+- **Security procedures**: Document all procedures
+- **Configuration baselines**: Standard configurations
+- **Risk assessments**: Regular risk evaluations
+- **Audit trails**: Maintain audit records
+
+### Training & Awareness
+- **Security training**: Regular security education
+- **Phishing awareness**: Social engineering protection
+- **Best practices**: Promote security best practices
+- **Incident reporting**: Encourage incident reporting
+
+## Physical Security
+
+### Hardware Protection
+- **Secure locations**: Physical access controls
+- **Environmental controls**: Temperature, humidity
+- **Power protection**: UPS, surge protection
+- **Asset tracking**: Hardware inventory management
+
+### Data Center Security
+- **Access controls**: Restricted physical access
+- **Surveillance**: Security cameras, monitoring
+- **Environmental monitoring**: Temperature, humidity
+- **Fire suppression**: Fire detection and suppression
+
+## Cloud Security
+
+### Cloud Services
+- **Shared responsibility**: Understand security models
+- **Identity management**: Cloud identity integration
+- **Data sovereignty**: Data location requirements
+- **Vendor assessment**: Evaluate cloud providers
+
+### Hybrid Security
+- **Consistent policies**: Uniform security across environments
+- **Secure connectivity**: Encrypted cloud connections
+- **Data classification**: Consistent data handling
+- **Monitoring integration**: Unified security monitoring
+
+## Regular Security Tasks
+
+### Daily Tasks
+- **Monitor alerts**: Review security alerts
+- **Check logs**: Review critical system logs
+- **Verify backups**: Ensure backup completion
+- **Update awareness**: Stay informed on threats
+
+### Weekly Tasks
+- **Vulnerability scans**: Run security scans
+- **Access reviews**: Review user access
+- **Patch assessment**: Evaluate available patches
+- **Incident review**: Review security incidents
+
+### Monthly Tasks
+- **Security metrics**: Generate security reports
+- **Policy reviews**: Review security policies
+- **Training updates**: Update security training
+- **Vendor assessments**: Review vendor security
+
+### Quarterly Tasks
+- **Risk assessments**: Comprehensive risk evaluation
+- **Penetration testing**: Security testing
+- **Disaster recovery**: Test recovery procedures
+- **Security audits**: Internal security audits
+
+---
+**Status**: ✅ Security guidelines implemented across all homelab systems