Editing System:Security

This document describes the security architecture of the reverse proxy system.

== Defense in Depth ==

The system uses multiple layers of security:

=== '''Public Layer''': Caddy with SSL/TLS encryption (Let's Encrypt) ===
== '''VPN Layer''': Encrypted tunnel between VPS and NAS ==
== '''Internal Layer''': Services only accessible via VPN ==
== '''Certificate Security''': Automatic renewal prevents expired certificates ==

== Security Benefits ==

* '''No Direct Exposure''': Synology NAS is not directly accessible from the internet

* '''Encrypted Traffic''': All public traffic uses HTTPS

* '''Isolated Network''': Internal services communicate over VPN

* '''Certificate Management''': Automatic SSL certificate renewal

== Security Components ==

=== SSL/TLS Encryption ===

* All public-facing traffic uses HTTPS

* Let's Encrypt certificates automatically renew

* HTTP traffic is redirected to HTTPS

=== VPN Encryption ===

* OpenVPN provides encrypted tunnel between VPS and NAS

* All internal traffic is encrypted through VPN

* Certificate-based authentication for VPN clients

=== Network Isolation ===

* Internal services only accessible via VPN

* No direct internet exposure of Synology NAS

* Firewall rules control traffic flow

== Related Documentation ==

* [Network Architecture](network-architecture.md) - Network topology

* [Key Components](components.md) - Component details

* [OpenVPN Server](index.md) - VPN security configuration

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