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ryan4yin | 二花
e5b95affa6
Hosts used to trust the router as the only boundary (servers ran with the firewall off; service ports were opened globally), so any LAN device could reach every host service. Move filtering to the hosts as defence in depth behind the router, which keeps its firewall on and uses a port mapping for the few ports we actually need. - base: nftables backend; deny inbound by default; trust the home LAN by source and the tailnet by interface (restrict the tailnet with ACLs); suppress per-service `openFirewall` global ports; allow node_exporter only from the monitoring host. The local podman bridge, the tailnet and the pod CIDRs are accepted only after the node_exporter drop. - servers: stop disabling the firewall; drop redundant global port opens (caddy 80/443, NFS 2049, Jellyfin, localsend/test ports); delete the redundant desktop firewall module; aarch64/riscv64 import the firewall explicitly (akane was missing it). - k3s: Cilium pods (10.0.0.0/8, fd00::/8) may reach host services; drop the flannel-era cni0/flannel.1 trust. - youko: postgres listens on localhost + the LAN with pg_hba limited to the LAN; the NFS export stays LAN-scoped; remove the unauthenticated v2ray proxy. - tests: `security-firewall` asserts every host runs the shared firewall, has the LAN CIDR rule and no global ports.
NixOS / Nix-Darwin's Submodules
This directory contains modular NixOS and Nix-Darwin configurations organized by platform and functionality.
Current Structure
modules/
├── README.md
├── base/ # Common configuration for all platforms
│ ├── default.nix
│ ├── fonts.nix # System font configuration
│ ├── nix.nix # Nix package manager settings
│ ├── overlays.nix # Package overlays
│ ├── packages.nix # Essential system packages
│ ├── security.nix # Basic security settings
│ └── users.nix # User management
├── darwin/ # macOS-specific modules
│ ├── README.md
│ ├── apps.nix # macOS applications
│ ├── broken-packages.nix # Package compatibility fixes
│ ├── default.nix
│ ├── nix-core.nix # Core Nix configuration
│ ├── security.nix # macOS security settings
│ ├── ssh.nix # SSH configuration
│ ├── system.nix # System-level settings
│ └── users.nix # macOS user management
└── nixos/ # NixOS-specific modules
├── base/ # Base NixOS configuration
│ ├── btrbk.nix # Local btrfs snapshots
│ ├── core.nix # Core system settings
│ ├── default.nix
│ ├── i18n.nix # Internationalization
│ ├── kernel-hardening.nix # Kernel hardening (module blacklisting)
│ ├── monitoring.nix # System monitoring
│ ├── networking/ # Network configuration
│ ├── nix.nix # Nix settings
│ ├── packages.nix # System packages
│ ├── remote-building.nix # Remote build setup
│ ├── restic-backup.nix # Encrypted off-host backups (see ../BACKUP.md)
│ ├── ssh.nix # SSH daemon configuration
│ ├── trash.nix # Trash retention cleanup
│ ├── user-group.nix # User and group management
│ └── zram.nix # ZRAM swap configuration
├── desktop.nix # Desktop environment configuration
├── desktop/ # Desktop-specific modules
│ ├── computer-use.nix # Headless X11/i3 session for AI agents
│ ├── default.nix
│ ├── fhs.nix # FHS environment
│ ├── fonts.nix # Desktop fonts
│ ├── gaming.nix # Gaming support
│ ├── misc.nix # Miscellaneous desktop settings
│ ├── networking/ # Network-related desktop configs
│ ├── nix.nix # Desktop Nix settings
│ ├── peripherals.nix # Peripheral device configuration
│ ├── power.nix # Power management
│ ├── security.nix # Desktop security settings
│ ├── ssh.nix # Desktop SSH configuration
│ ├── virtualisation.nix # Virtualization support
│ └── xdg.nix # XDG base directory settings
└── server/ # Server-specific modules
├── qemu-guest-hardware-configuration.nix
├── qemu-guest.nix # VM guest base module (libvirt/QEMU guests)
├── server-aarch64.nix
├── server-riscv64.nix
└── server.nix
Module Categories
1. Base Modules (base/)
Common configuration shared between NixOS and macOS:
- System fonts and localization
- Essential packages and tools
- Basic security settings
- User management
- Package overlays
2. macOS Modules (darwin/)
macOS-specific configuration:
- macOS applications and system settings
- Security configurations tailored for macOS
- SSH and system-level settings
- Package compatibility fixes
3. NixOS Modules (nixos/)
Platform-specific NixOS configuration:
- Base: Core system settings and services
- Desktop: Desktop environment and GUI applications
- Server: Server-specific optimizations and services
Usage
Modules are imported based on platform detection:
- NixOS Systems: Import
nixos/modules - macOS Systems: Import
darwin/modules - All Systems: Import
base/modules for shared configuration
Architecture Support
- x86_64-linux: Desktop and server configurations
- aarch64-linux: ARM64 Linux systems
- aarch64-darwin: Apple Silicon macOS systems
- server-riscv64: RISC-V server configurations